2019年09月, 日本金属学会, 論文賞　　　　　　　　　　　　　　　
三浦 誠司

2018年09月, 日本金属学会, 学術貢献賞　　　　　　　　　　　　　　　
三浦 誠司

1995年12月, 日本金属学会, ポスター賞　　　　　　　　　　　　　　　
三浦 誠司, 国内学会・会議・シンポジウム等の賞

1995年12月, 日本金属学会, 奨励賞　　　　　　　　　　　　　　　
力学特性部門
三浦 誠司

1992年05月, 本多記念会, 本多記念研究奨励賞　　　　　　　　　　　　　　　
三浦 誠司

Fabrication of Textured Ti₂AlC-MAX Phase Ceramic by Slip Casting under Strong Magnetic Field and Spark Plasma Sintering, and Its Crystal Orientation Dependence of Room Temperature Deformation Behavior
Johtaro MURAOKA, Ken-ichi IKEDA, Seiji MIURA, Koji MORITA, Tohru S. SUZUKI, Yoshio SAKKA
Journal of the Japan Society of Powder and Powder Metallurgy, 71, 7, 257, 262, Japan Society of Powder and Powder Metallurgy, 2024年07月15日
研究論文（学術雑誌）

Orientation Dependence of High Temperature Compressive Behavior of Textured Ti₃SiC₂
Yuji Shirakami, Ken-ichi Ikeda, Seiji Miura, Koji Morita, Tohru S. Suzuki, Yoshio Sakka
Journal of the Japan Institute of Metals and Materials, 88, 7, 129, 136, Japan Institute of Metals, 2024年07月01日
研究論文（学術雑誌）

Effect of Grain Boundary Characters on Precipitation Behavior and Local Deformation Behavior in Al–Mg–Si Alloy
Takuya Hashimoto, Ken-ichi Ikeda, Seiji Miura
MATERIALS TRANSACTIONS, 64, 8, 1959, 1968, Japan Institute of Metals, 2023年08月01日
研究論文（学術雑誌）

Compressive Deformation Characteristics of Nb₂Co₇ as Crystalline Mille-Feuille Structured Material
Toshiaki Horiuchi, Konatsu Yamada, Shigeru Saito, Ken-ichi Ikeda, Seiji Miura, Frank Stein
MATERIALS TRANSACTIONS, 64, 7, 1622, 1630, Japan Institute of Metals, 2023年07月01日
研究論文（学術雑誌）

Orientation Dependence of High Temperature Compressive Behavior of Textured Ti₃SiC₂
Yuji Shirakami, Ken-ichi Ikeda, Seiji Miura, Koji Morita, Tohru S. Suzuki, Yoshio Sakka
MATERIALS TRANSACTIONS, 64, 4, 805, 812, Japan Institute of Metals, 2023年04月01日
研究論文（学術雑誌）

Orientation Dependence of Plastic Deformation Behavior and Fracture Energy Absorption Mechanism around Vickers Indentation of Textured Ti₃SiC₂ Sintered Body
Yuji Shirakami, Ken-ichi Ikeda, Seiji Miura, Koji Morita, Tohru S. Suzuki, Yoshio Sakka
MATERIALS TRANSACTIONS, 64, 3, 650, 656, Japan Institute of Metals, 2023年03月01日
研究論文（学術雑誌）

Kink Formation through Creep Deformation and Possibility of Kink Strengthening in Ti₃SiC₂ MAX Phase
Daiki Matsui, Koji Morita, Daisuke Terada, Ken-ichi Ikeda, Seiji Miura
Materials Transactions, 63, 7, 1055, 1064, The Japan Institute of Metals and Materials, 2022年07月01日, ［査読有り］, ［国際誌］
英語, 研究論文（学術雑誌）, Kink formation and kink strengthening mechanisms were examined in the polycrystalline Ti3SiC2 MAX phase prepared by a reaction sintering process using a spark-plasma-sintering machine. The creep behavior tested by compression at 1200°C showed two deformation regions depending on the applied stresses; at stresses lower than 120 MPa, the stress exponent n exhibited μ1.8, whereas at higher stresses, it exhibited n 2 6. The creep behavior can be ascribed to grain boundary sliding mechanisms for the lower stresses with n μ 1.8 and to dislocation-related creep mechanisms for the higher stresses with n 2 6. The kink bands were frequently observed to form in the grains deformed only at the higher stresses when its basal plane was inclined by about 1020° against the compressive axis. This suggests that the kink bands might be formed only when two factors of the high stresses acting on the basal plane and the resultant dislocation activities were satisfied. Nanoindentation tests conducted around the formed kink bands showed that the nanohardness linearly changed with the distance from the kink bands and showed higher values around the kink bands. Since the kink bands blocked the slip line caused by the nanoindentation, those become obstacles against the dislocation motion caused by the indentation deformation. This suggests that the kink bands would contribute to improving the mechanical properties of the Ti3SiC2 MAX phase.

Fabrication of Textured Porous Ti₃SiC₂ by Slip Casting under High Magnetic Field and Microstructural Evolution through High Temperature Deformation
Nana Hashimoto, Ken-ichi Ikeda, Seiji Miura, Koji Morita, Tohru S. Suzuki, Yoshio Sakka
MATERIALS TRANSACTIONS, 63, 2, 133, 140, Japan Institute of Metals, 2022年02月01日
研究論文（学術雑誌）

Kink Formation through Creep Deformation and Possibility of Kink Strengthening in Ti₃SiC₂-MAX Phase
Daiki Matsui, Koji Morita, Daisuke Terada, Ken-ichi Ikeda, Seiji Miura
Journal of the Japan Institute of Metals and Materials, 85, 12, 439, 448, Japan Institute of Metals, 2021年12月01日
研究論文（学術雑誌）

強磁場中スリップキャストによる配向ポーラスTi₃SiC₂焼結体の作製とその高温変形組織
橋本 菜々, 池田 賢一, 三浦 誠司, 森田 孝治, 鈴木 達, 目 義雄
Journal of the Japan Institute of Metals and Materials, 85, 7, 256, 263, Japan Institute of Metals, 2021年07月01日, ［査読有り］
研究論文（学術雑誌）

The effect of titanium and silicon addition on phase equilibrium and mechanical properties of CoCrFeMnNi-based high entropy alloy
Syuki Yamanaka, Ken-ichi Ikeda, Seiji Miura
JOURNAL OF MATERIALS RESEARCH, 36, 10, 2056, 2070, SPRINGER HEIDELBERG, 2021年05月, ［査読有り］, ［招待有り］, ［責任著者］
英語, 研究論文（学術雑誌）, The effects of Ti and Si addition on the phase equilibrium and mechanical properties of the equiatomic CoCrFeMnNi high entropy alloy (Cantor alloy) were investigated. The phase equilibrium at 1000 degrees C was determined from the result of X-ray diffraction and electron probe micro-analysis. Ti addition stabilizes the sigma phase, A12 phase and C14-Laves phase, while Si addition stabilizes the A13 phase. The phase relationships were represented by projection onto (Co, Fe, Mn, Ni)-Cr-X(Ti or Si) isothermal ternary cross-section at 1000 degrees C in Co-Cr-Fe-Mn-Ni-X senary system. Tensile tests were conducted on Cantor-based fcc single solid solution alloys with Ti or Si dissolution at room temperature. The 0.2% yield strength and ultimate tensile strength increased with either element addition. The Ti-added alloy showed higher strength than the Si-added alloy. The difference in ductility in the alloys is related to their strain hardening behavior in the higher strain range.

Elastic isotropy originating from heterogeneous interlayer elastic deformation in a Ti₃SiC₂ MAX phase with a nanolayered crystal structure
Ruxia Liu, Masakazu Tane, Hajime Kimizuka, Yuji Shirakami, Ken-ichi Ikeda, Seiji Miura, Koji Morita, Tohru S. Suzuki, Yoshio Sakka, Lianmeng Zhang, Tohru Sekino
Journal of the European Ceramic Society, 41, 4, 2278, 2289, Elsevier BV, 2021年04月, ［査読有り］
研究論文（学術雑誌）, The elastic properties of a single-crystalline Ti SiC MAX phase with a nanolayered crystal structure, comprising Ti-Si and two distinct Ti-C bonding layers, that had remained unclear because of the difficulty in growing large single crystals, were studied. Rather than unavailable large single crystals, polycrystalline samples with a crystallographic texture were prepared. By analyzing the polycrystalline elastic constants on the basis of an inverse Voigt–Reuss–Hill approximation, the elastic properties of a single crystal Ti SiC with a hexagonal symmetry were determined. This revealed that the single-crystalline Young's modulus was almost isotropic despite its highly anisotropic layered structure. The shear modulus for (0001)〈112¯0〉 was higher than that for {112¯0}[0001] in contrast to the basal slip-dominated plastic deformation reflecting the layered structure. Furthermore, first-principles calculations revealed that heterogeneous interlayer elastic deformation caused by the stabilization of Ti-Si bonding is the origin of the elastic isotropy in a Ti SiC MAX phase. 3 2 3 2 3 2

Al-Mg-Si系合金の析出挙動・局所力学挙動に及ぼす粒界性格の影響
橋本拓也, 池田賢一, 三浦誠司
日本金属学会誌, 85, 1, 7, 16, Japan Institute of Metals, 2021年01月, ［査読有り］, ［最終著者］
研究論文（学術雑誌）

Orientation Dependence of Plastic Deformation Behavior and Fracture Energy Absorption Mechanism around Vickers Indentation of Textured Ti₃SiC₂ Sintered Body
Yuji SHIRAKAMI, Ken-ichi IKEDA, Seiji MIURA, Koji MORITA, Tohru S. SUZUKI, Yoshio SAKKA
Journal of the Japan Society of Powder and Powder Metallurgy, 67, 11, 607, 614, Japan Society of Powder and Powder Metallurgy, 2020年11月15日, ［査読有り］
研究論文（学術雑誌）, In order to clarify plastic deformation behavior and mechanism of fracture energy absorption of Ti3SiC2, Vickers indentation tests were conducted for Ti3SiC2 sintered bodies with various textured orientations. Textured Ti3SiC2 sintered bodies were fabricated by slip casting in a strong magnetic field and spark plasma sintering (SPS), and their orientation distribution were analyzed by SEM/EBSD. It was found that for the textured Ti3SiC2, the plastic deformation behavior around Vickers indents such as an indent shape and a grain pile-up were strongly affected by basal slip and kink deformation. Furthermore, the fracture energy absorption mechanism around the indents also depended on the texture orientations. From our results, it is concluded that the most effective factor for suppressing the crack propagation was the grain pile-up, and the second one was crack deflections.

新たなin situ圧子圧入法としての改良型顕微インデンテーション法の開発と応用　　　　　　　　　　　　　　　
峯田才寛, 三浦誠司, 岡和彦, 宮島達也
日本金属学会誌, 84, 4, 128, 134, 2020年04月, ［査読有り］
日本語, 研究論文（学術雑誌）

Relationship between mechanical properties and age-hardening behavior around grain boundaries of Al-Mg-Si alloy
Takuya Hashimoto, Ken-ichi Ikeda, Seiji Miura
MATEC Web of Conferences, 326, 03002, 03002, EDP Sciences, 2020年
研究論文（学術雑誌）, Nanoindentation tests were conducted near the grain boundary (GB) of the Al-Mg-Si alloy, and the influence of GB character on the aging precipitation behavior and the mechanical properties was confirmed. After obtaining the GB characters by electron back scattered diffraction (EBSD) analysis, nanoindentation tests were carried out on under-aged, peak-aged, and over-aged samples. And then, the indentation areas were observed by back scattered electrons imaging (BSE) in order to identify indentation positions with respect to the GB. In this study, for the GB character, focusing on the rotation angle, the high-angle GB (HAGB) and the low-angle GB (LAGB) were selected. In addition, coincident site lattice GBs (CSL) were selected as the special GB. In the 180°C under-aged samples, the nano-hardness near GB is higher than that far from GB, while 180°C peak-aged samples, the nano-hardness is lower than that far from GB. Then the range near the GB where the hardness changes was larger at HAGB than at LAGB and CSL3. This suggests that the GB character affects the aging precipitation behavior and mechanical properties.

Formation of LPSO Phases in As-Cast Mg-Al-Zn-Gd Quaternary Alloys
Kazuki Masaoka, Tadayuki Yamada, Toshiaki Horiuchi, Takaomi Itoi, Seiji Miura
MATERIALS TRANSACTIONS, 61, 5, 849, 855, JAPAN INST METALS & MATERIALS, 2020年, ［査読有り］
英語, 研究論文（学術雑誌）, Mg alloys with a long-period stacking-order (LPSO) phase are categorized into two types. Those in which the LPSO phase forms in as-cast state are referred to as Type I, while those in which the LPSO phase does not appear until a heat treatment is performed are categorized as Type II. However, the reason that gives rise to these two types of alloy is still not well understood. In the present study, in an attempt to clarify this issue, three different Mg-85(Al,Zn)(6)Gd-9 quaternary alloys were prepared. The alpha-Mg, Al2Gd, Mg3Gd and LPSO phases were identified in the as-cast quaternary alloys by microstructural observations, composition analysis and crystal structure analysis using electron probe microanalysis and X-ray diffraction. The results indicated that all the quaternary alloys could be categorized as Type I, even though ternary Mg(85)Al(6)GD(9) and Mg85Zn6Gd9 alloys were Type II. The crystal structure of the LPSO phase in the as-cast alloys is considered to be18R with dilute solute elements, and the fraction of this phase increases with increasing Zn content. The presence of this phase is thought to be the cause of destabilization of the primary Al2Gd phase. It is thus concluded that the relative stability of phases in the vicinity of the LPSO phase is crucial in determining the type of Mg alloy formed.

Application of Modified Optical Indentation Microscopy as New In Situ Indentation Method
Takahiro Mineta, Seiji Miura, Kazuhiko Oka, Tatsuya Miyajima
JOURNAL OF THE JAPAN INSTITUTE OF METALS AND MATERIALS, 84, 4, 128, 134, JAPAN INST METALS & MATERIALS, 2020年, ［査読有り］
日本語, 研究論文（学術雑誌）, In the present study, a newly established in situ indentation technique by the use of an optically transparent indenter and an immersion liquid, so-called "modified optical indentation microscopy", was applied for an investigation on the plastic deformation behavior of various samples during indentation. In this technique, the gap between the indenter and the specimen surface is filled with the immersion liquid such as silicone oil and kerosene to widely observe the specimen surface during indentation. In the in situ observations by this technique using polycrystalline pure Mg, the occurrence of various plastic deformation mechanisms and the increase of the anisotropic contact area during indentation can be recognized. Moreover, the increase and the decrease of the contact area which is corresponding to superelasticity during indentation were observed by this technique using the TiNi superelastic alloy. The results of the in situ observations were consistent with the analysis results based on the Hertz theory.

Effect of Si on the stability of NbCr2 Laves phase in Cr-Mo-Nb system
Li Peng, Satoshi Takizawa, Ken-ichi Ikeda, Toshiaki Horiuchi, Seiji Miura
INTERMETALLICS, 110, 106457, ELSEVIER SCI LTD, 2019年07月, ［査読有り］, ［最終著者, 責任著者］
英語, 研究論文（学術雑誌）, An experimental study on a part of the Cr-Nb-Mo-Si quaternary phase diagram associated with the NbCr2 Laves phase is conducted. It is found that most of the Si added to 50Cr-30Mo-20Nb alloys is distributed in the NbCr2 Laves phase and that the amount of Mo in the Laves phase increases with increasing Si addition. The Laves phase in Cr-Mo-Nb alloys with higher Si addition is found to be more stable. Electronic structure calculations based on density functional theory are performed to examine the effects of Mo and Si co-doping on the formation enthalpy of NbCr2. It is found that the co-doping effectively increases the stability of the Laves phase. This result is consistent with the effect of the atomic size ratio D-A/D-B on the stability of the AB(2) Laves phase, where D-A and D-B are the average atomic diameters of atoms occupying the A and B sites of the AB(2) structure, respectively.

Formation of LPSO Phases in As-Cast Mg-Al-Zn-Gd Quaternary Alloys
Kazuki Masaoka, Tadayuki Yamada, Toshiaki Horiuchi, Takaomi Itoi, Seiji Miura
JOURNAL OF THE JAPAN INSTITUTE OF METALS AND MATERIALS, 83, 8, 257, 263, JAPAN INST METALS & MATERIALS, 2019年, ［査読有り］
日本語, 研究論文（学術雑誌）, Mg alloys with long period stacking ordered (LPSO) phases are categorized into two types. Mg alloys where the LPSO phase forms in as-cast state are categorized as Type I, while those where the LPSO phase does not appear in as-cast state but forms during heat treatment are categorized as Type H. However, the origin of the formation type of Mg alloys with LPSO phases still remains poorly understood. In the present study, three different Mg-85 (Al, Zn)(6)Gd-9 quaternary alloys were prepared to elucidate the dominant factors that determine the formation type of Mg alloys with LPSO phases. The a-Mg. Al2Gd, Mg3Gd and LPSO phases were characterized in the as-cast quaternary alloys by microstructural observation, composition analysis and crystal structure analysis by using electron probe microanalysis and X -ray diffraction. It indicates that all the quaternary alloys are categorized as Type I even though the original two ternary Mg85Al6Gd9 and Mg85Zn6Gd9 alloys are categorized as Type II. The crystal structure of the LPSO phases observed in the as-cast alloys is considered to be 18R with dilute solute elements. The amount of the LPSO phases in the as-cast state increases with increasing the 7,n content in the alloys. it is considered to be the cause of destabilization of the primary crystallized Al2Gd phase by the addition of Zn and hence relative stabilization of the LPSO phases. It is thus concluded that the relative phase stability in the vicinity of the LPSO phase is considered to be crucial for determination of the formation type of Mg alloys with LPSO phases.

Mg-Al-Zn-Gd 4元系合金鋳造まま材におけるLPSO相の生成挙動　　　　　　　　　　　　　　　
正岡和貴, 山田忠幸, 堀内寿晃, 糸井貴臣, 三浦誠司
日本金属学会誌, 2019年, ［査読有り］
日本語, 研究論文（学術雑誌）

Effect of Si addition on the stability of NbCr2 Laves phase with Mo　　　　　　　　　　　　　　　
Li Peng, Satoshi Takizawa, Ken-ichi Ikeda, Toshiaki Horiuchi, Seiji Miura
Intermetallics, 2019年, ［査読有り］, ［最終著者, 責任著者］
英語, 研究論文（学術雑誌）

Effect of Multi-Elements Substitution on the Mechanical Properties of Intermetallic Compound
Syuki Yamanaka, Ken-ichi Ikeda, Seiji Miura
MRS ADVANCES, 4, 25-26, 1497, 1502, CAMBRIDGE UNIV PRESS, 2019年, ［査読有り］
英語, 研究論文（学術雑誌）, It is well known that various elements substitute for a certain sub-lattice of intermetallic compounds. There have been various experimental investigations of the effects of substituted elements on mechanical properties, however. there are few reports describing the effects of multi-element substitution. In the present study, L1(2)-type compounds A(3)B (Ni3Al and Co-3(Al,W)) were selected as model compounds because their substitution behavior is well known. It was reported that various elements such as Ni, Co, Cu, Pd and Pt occupy the A-site, whereas Al, Si, Ga, Ge, Ti, V, Nb, Ta, Mo, and W occupy the B-site. These elements are expected to introduce local lattice distortion, which may affect the motion of dislocations over a wide range of temperatures. Several alloys composed of five or more elements including Ni, Co, Al, Mo, and W, were prepared using an Ar-arc melting machine and heat-treated. Several alloys were found to include an (Ni, Co)(3) (Al, Mo, W, ...)-L1(2) compound as a constituent phase. The nano-hardness of these L1(2) phases was higher than that of the high-strength Co-3(Al,W)-L1(2) compound, confirming that multi-element substitution is an effective way to improve the mechanical properties of an intermetallic compound without decreasing the phase stability.

Phase Equilibrium and Mechanical Properties of Cr-Mo-Nb-Si-B Alloys Composed of BCC and T2-silicide Phase
Daisuke Goto, Ken-ichi Ikeda, Seiji Miura
MRS Advances, 4, 25-26, 1491, 1496, 2019年, ［査読有り］
英語, 研究論文（学術雑誌）

Application of Modified Optical Indentation Microscopy as New In Situ Indentation Method
Takahiro Mineta, Seiji Miura, Kazuhiko Oka, Tatsuya Miyajima
MATERIALS TRANSACTIONS, 60, 8, 1416, 1422, JAPAN INST METALS & MATERIALS, 2019年, ［査読有り］
英語, 研究論文（学術雑誌）, In the present study, a newly established in situ indentation technique by the use of an optically transparent indenter and an immersion liquid, so-called "modified optical indentation microscopy", was applied for an investigation on the plastic deformation behavior of various samples during indentation. In this technique, the gap between the indenter and the specimen surface is filled with the immersion liquid such as silicone oil and kerosene to widely observe the specimen surface during indentation. In the in situ observations by this technique using polycrystalline pure Mg, the occurrence of various plastic deformation mechanisms and the increase of the anisotropic contact area during indentation can be recognized. Moreover, the increase and the decrease of the contact area which is corresponding to superelasticity during indentation were observed by this technique using the TiNi superelastic alloy. The results of the in situ observations were consistent with the analysis results based on the Hertz theory.

Investigation of the Cross-Sectional Structure and Isothermal Section at 1150 degrees C of a Nb-Re-Si Alloy Fabricated Using a Tetra-Arc Furnace
Shigeru Saito, Toshiyuki Takashima, Toshiaki Horiuchi, Seiji Miura, Toshio Narita
MATERIALS TRANSACTIONS, 60, 4, 611, 615, JAPAN INST METALS & MATERIALS, 2019年, ［査読有り］
英語, 研究論文（学術雑誌）, Ternary Nb-Re-Si alloy samples were melted and pulled simultaneously in a tetra-arc furnace and rapidly water-quenched after heat treatment at 1150 degrees C for 1200 h. The microstructures of the samples that had been water-quenched after heat treatment were observed and the Nb, Re and Si concentrations in the constituent phases were measured using an electron probe microanalyzer (EPMA). In the cross-sectional structure of the obtained alloy samples, the lower portion of the pulled part consists of Nb5Si3 and Nb-Re-Si ternary compound phases. By contrast, the upper portion consists of Nb5Si3 and Nb solid solution phases. The Nb solid-solution phase, Nb5Si3 and Nb-Re-Si ternary compound are in equilibrium. It was found that the solubility limit of Si in the Nb solid-solution phase ranges from 0.6 to 1.7 at%, while the solubility limit of Re in the Nb5Si3 phase is 1.3-2.0 at%. The maximum amount of Re in the Nb5Si3 phase in equilibrium with the Nb solid solution is about 0.9 at%.

Microstructural Evolution and Mechanical Properties of a Three-Phase Alloy in the Cr-Mo-Nb System
Li Peng, Ken-ichi Ikeda, Toshiaki Horiuchi, Seiji Miura
MATERIALS TRANSACTIONS, 60, 2, 246, 253, JAPAN INST METALS, 2019年, ［査読有り］
英語, 研究論文（学術雑誌）, A new three-phase alloy of 50Cr-30Mo-20Nb (at%) was studied based on the Cr-Mo-Nb ternary phase diagram, and was composed of a Cr-rich BCC1 phase, a Mo-rich BCC2 phase and a NbCr2 Laves phase after heat treatment at around 1523K or lower. A supersaturated BCC single-phase solid solution alloy obtained by homogenization at 1973K for 1 h underwent microstructural evolution during heat treatment at 1473 K. Intragranular precipitation of the Cr-rich BCC1 phase occurred, which led to the formation of an alternating BCC1/BCC2 two-phase microstructure through a discontinuous precipitation process, followed by precipitation of the Laves phase at the BCC1/BCC2 interphase boundaries. At a higher temperature of 1523 K, a similar microstructure was observed, with increased BCC decomposition and Laves precipitation rates, while the alloy consisted of BCC and Laves phases at 1773 K. The mechanical properties of alloys heat treated at 1473K for various periods after the solid-solution treatment were also investigated. A maximum fracture strength of 1493 MPa and a minimum hardness of 773 +/- 7 HV were obtained for an alloy aged for 24 h, where the BCC1/BCC2 two-phase microstructure dominated. The Vickers hardness of an alloy aged for 72 h, which had a fine-grained microstructure that included the Laves phase, was 839 +/- 8 HV under a load of 0.5 kgf, and no obvious microcracks were observed.

Fabrication of Ni-aluminides long-fiber reinforced Ni matrix composite by a reaction at narrow holes method
Yoshimi Watanabe, Shingo Gonda, Hisashi Sato, Seiji Miura
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 259, 320, 331, ELSEVIER SCIENCE SA, 2018年09月, ［査読有り］
英語, 研究論文（学術雑誌）, A novel method (reaction at narrow holes method, RANH method) to fabricate an intermetallic compound fiber / metal matrix composite is proposed. Narrow holes are drilled in the metal matrix A, and then metal fibers B are inserted into these holes. The assembly is heated to elevated temperatures to obtain molten metal B in the holes. Then the reaction between A and B should cause within the narrow holes. During the reaction, intermetallic compound of A,B replaces the metal B keeping its fiber shape embedded in the metal matrix A. In this study, a Ni-aluminides fiber / Ni composite is fabricated by the novel method. Microstructure and mechanical property of these specimens were investigated. To evaluate the reaction during the RANH method, in-situ observation by laser scanning microscope and differential thermal analysis (DTA) were also carried out. From obtained results, effects of swaging treatment and heating condition on these microstructure and mechanical property were discussed.

Plastic Deformation Behavior of Mg-Y Alloy Single Crystals Observed Using In Situ Brinell Indentation
Takahiro Mineta, Seiji Miura, Kazuhiko Oka, Tatsuya Miyajima
MATERIALS TRANSACTIONS, 59, 4, 602, 611, JAPAN INST METALS, 2018年, ［査読有り］
英語, 研究論文（学術雑誌）, A newly established in situ Brinell indentation technique was conducted to investigate the plastic deformation behavior of pure Mg and Mg-Y alloy single crystals under complex stress conditions. The deformation morphology on the upper surfaces of the specimen around the indent could not be sufficiently observed using the previously reported in situ indentation methods with an optically transparent indenter due to the refraction of rays at the indenter/air interface. In this study, the gap between the indenter and the specimen surface is filled with immersion liquids such as silicone oil and kerosene. This technique enables observation of the specimen surface during indentation. Application of the in situ Brinell indentation to pure Mg and Mg-Y alloy single crystals revealed that the shape of the indents is not circular but elliptical, even during loading. The aspect ratio of the indents decreases with increasing Y content. Moreover, the occurrence of plastic deformation around the indents and beneath the indenter could be observed during the loading and unloading processes using the in situ Brinell indentation method.

テトラアーク引上炉を用いて作製したNb-Re-Si合金の断面組織と1150℃における等温断面図の検討
齋藤 繁, 高島 敏行, 堀内 寿晃, 三浦 誠司, 成田 敏夫
日本金属学会誌, 82, 11, 409, 414, JAPAN INST METALS & MATERIALS, 2018年, ［査読有り］
日本語, 研究論文（学術雑誌）, Ternary Nb-Re-Si alloy samples were melted and pulled simultaneously in a tetra-arc furnace and rapidly water-quenched after heat treatment at 1150 degrees C for 1200 h. The microstructures of the samples that had been water-quenched after heat treatment were observed and the Nb, Re and Si concentrations in the constituent phases were measured using an electron probe microanalyzer (EPMA). In the cross-sectional structure of the obtained alloy samples, the lower portion of the pulled part consists of Nb5Si3 and Nb Re-Si ternary compound phases. By contrast, the upper portion consists of Nb5Si3 and Nb solid solution phases. The Nb solid-solution phase, Nb5Si3 and Nb-Re-Si ternary compound are in equilibrium. It was found that the solubility limit of Si in the Nb solid-solution phase ranges from 0.6 to 1.7 at%, while the solubility limit of Re in the Nb5Si3 phase is 1.3-2.0 at%. The maximum amount of Re in the Nb5Si3 phase in equilibrium with the Nb solid solution is about 0.9 at%.

Laves Phase Precipitation Behavior and the Orientation Relationship with BCC in Cr-Mo-Nb System
Li Peng, Ken-ichi Ikeda, Toshiaki Horiuchi, Seiji Miura
MATERIALS TRANSACTIONS, 59, 11, 1706, 1715, JAPAN INST METALS, 2018年, ［査読有り］
英語, 研究論文（学術雑誌）, The isothermal sections of the Cr-Mo-Nb ternary phase diagram have been studied. The C15 NbCr2 Laves precipitation behavior in three different alloys has been investigated in the Cr-Mo-Nb ternary system. The orientation relationship (OR) of NbCr2 in BCC matrix among BCC/Laves two-phase alloys and Cr-rich BCC1/Mo-rich BCC2/Laves three-phase alloy is different at 1473 K; OR 1: (011)(BCC) // (111)(C15), [011](BCC) // [110](C15) and OR 2: (411)(BCC) //; [111](C15), // [110](C15) with low lattice mismatch are both observed in Cr-rich alloys #3 (74Cr-16Mo-10Nb) and #2 (50Cr-30Mo-20Nb). OR 3: (011)(BCC) (111)(C15), [111](BCC) // [011](C15) with a lattice mismatch relatively larger than that of OR 1 and OR 2 is only observed in alloy #2, which may be due to the presence of BCC, and BCC2 interphases formed after BCC decomposition. Only discontinuous precipitation is observed at grain boundaries in Cr-lean alloy #1 (42Cr-31 Mo 27Nb) without obvious OR between the BCC matrix and Laves phase.

Influence of Atomic Size Factors on the Phase Stability of Laves Phase in Nb-Cr-Ni-Al and Nb-V-Ni-Al Phase Diagrams
Takuya Yamanouchi, Seiji Miura
MATERIALS TRANSACTIONS, 59, 4, 546, 555, JAPAN INST METALS, 2018年, ［査読有り］
英語, 研究論文（学術雑誌）, Phase equilibria among the refractory bcc solid solution (bcc(ss)), B2, and Laves phases in Nb-Cr-NiAl and Nb-V-NiAl isothermal sections were studied with the aim of introducing the NiAl-B2 phase and/or Al-containing Laves phase for improvement of the oxidation resistance of the bcc(ss) phase as an Al reservoir layer for the Al2O3 surface layer. Laves phases appear in a wide composition range in both of the isothermal sections, which prevent equilibration of NiAl-B2 with the Nb-rich bcc(ss) phase. The geometrical model proposed by Edwards was applied to understand the site-substitution behavior of the multi-component AB(2) Laves phase. In the Nb-Cr-NiAl, Nb-V-NiAl, and Nb-Mo-NiAl systems, the site-substitution behavior of the Laves phases could be explained by comparison of the average atomic diameters of NiAl-B2, Cr, V, and Mo.

In-Situ Observation of Deformation Behavior on Mg Single- and Poly-Crystals by Modified Optical Indentation Microscopy
Takahiro Mineta, Seiji Miura, Kazuhiko Oka, Tatsuya Miyajima, Hiroyuki Sato
The Proceedings of the Materials and Mechanics Conference, 2017, 619, 621, 一般社団法人 日本機械学会, 2017年10月, ［査読有り］
日本語, In order to investigate a plastic deformation behavior of Mg single- and poly-crystals under a complex deformation condition, in-situ Brinell indentation, which is referred to as a modified Brinell optical indentation microscopy, using an optically transparent indenter and an immersion liquid is conducted. This method enables to observe the contact area between the specimen and the indenter, and the specimen surface around the contact area during indentation. As the results of the modified Brinell optical indentation microscopy on a Ti-Ni superelastic alloy, it is recognized that not only increasing the contact area during loading process but also decreasing the contact area during unloading process can be observed by this method. Using the modified Brinell optical indentation microscopy on pure Mg single-crystals, it is revealed that the shape of the indents is not circle but elliptic because of difference in the relative activity of each plastic deformation mechanism. Moreover, decreasing the contact area caused by the pseudoelastic behavior during unloading process is not recognized in pure Mg single-crystals. In pure Mg poly-crystals, the elliptic indent shape is observed in each grain, and a large deformation occurs in the vicinity of the grain boundary in order to keep bonding two grains at the grain boundary.

Effect of crystal orientation on incipient plasticity during nanoindentation of magnesium
Hidetoshi Somekawa, Tomohito Tsuru, Alok Singh, Seiji Miura, Christopher A. Schuh
ACTA MATERIALIA, 139, 21, 29, PERGAMON-ELSEVIER SCIENCE LTD, 2017年10月, ［査読有り］
英語, 研究論文（学術雑誌）, The effect of crystal orientation on incipient plasticity during nanoindentation was investigated by experiments and molecular statics simulation. Pop-in behavior is a result of dislocation activity, and is therefore influenced by crystal orientation. Experimental results using single crystals indicated that indentations on the basal plane had higher pop-in loads and larger pop-in displacements than those on the prismatic plane, an effect also captured by molecular statics simulation. The difference can be traced to the types of activated dislocations, with not only basal but also pyramidal dislocations active for indentations on the basal plane, but only basal dislocations triggered at the first pop-in on the prismatic plane. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

The evaluation of the composition dependence of fracture toughness of Al3Nb alloys by using micro-size fracture testing
Nobuhiro Matsuzaki, Ken-Ichi Ikeda, Seiji Miura, Nobuaki Sekido, Takahito Ohmura
MRS Advances, 2, 26, 1405, 1410, Materials Research Society, 2017年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, Al3Nb is known as a high oxidation resistant material, while it is quite brittle. As the fracture toughness of Al3Nb single crystal and its dependence on the composition are not obtained, the micro-sized fracture testing proposed by Suzuki et al. was performed. Al3Nb single crystal micron-order size cantilevers with a chevron-notch were fabricated in a grain of two-phase polycrystalline alloys by using FIB (Focused Ion Beam). From the load-displacement curves during the bending by a nanoindenter, the average value of fracture toughness of Nb-rich Al3Nb is evaluated to be 2.90 MPam1/2, while the fracture toughness of Al-rich Al3Nb is also evaluated to be 2.82 MPam1/2. From this result, the fracture toughness of Al3Nb is less dependent on its Al/Nb ratio. Furthermore the fracture toughness of Al3 (Nb, V) was evaluated to be 2.82 MPam1/2.The fracture toughness of Al3Nb is seemingly insensitive to V addition.

Bcc / B2 phase equilibria and phase transformation from B2 to β’in refractory Nb-X(Pd, Rh, Ir)-Al
T. Yamanouchi, S. Miura, M. Ohno, K. Ikeda
MRS Advances, 2, 25, 1335, 1340, Materials Research Society, 2017年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, For the improvement of oxidation resistance of Nb-based alloys, PdAl-B2 is expected as Al reservoir for Al2O3 surface layer because it is in equilibrium with Nbss (bcc) phase. However, PdAl forms cracks during casting caused by B2 ->
β' transformation. To suppress B2 ->
β' transformation, Rh, Ru and Ir were chosen as additive elements. It is found that bcc / B2 two-phase field in Nb-Pd-Ir-Al system is limited to be small fraction of Ir, while (Pd,Rh)Al-B2 is in equilibrium with bcc solid solution in a wide composition range and addition of Rh prevents occurrence of B2 ->
β' transformation. Composition range of (Pd,Ru)Al-B2 in equilibrium with bcc phase is wider than (Pd,Ir)Al-B2 but narrower than (Pd,Rh)Al-B2. Rh and Ru addition are also beneficial for improving eutectic temperature of Nb-bcc / B2 aluminide two-phase alloys.

In-situ Brinell インデンテーションによるMg-Y 単結晶の塑性変形挙動観察
峯田才寛, 三浦誠司, 岡 和彦, 宮島達也
日本金属学会誌, 81, 4, 196, 205, JAPAN INST METALS & MATERIALS, 2017年, ［査読有り］
日本語, 研究論文（学術雑誌）, In order to understand a plastic deformation behavior of pure Mg and Mg-Y alloy single. crystals under a complex stress condition, newly established in. situ Brinell indentation was conducted. The deformation morphology on the upper surfaces of the specimen around the indent could not been sufficiently observed by the previously reported in. situ indentation methods using an optically transparent indenter due to refraction of rays at a surface of the indenter. In this study, the space between the indenter and the specimen surface are filled with immersion liquids such as silicone oil and kerosene. This technique enables to observe the specimen surface during indentation. Using in. situ Brinell indentation on pure Mg and Mg. Y alloy single. crystals, it is found that the shape of the indents on them are not circle but elliptic even during the loading. The aspect ratio of the indents decreases with increasing Y content. Moreover, occurrences of plastic deformation mechanisms around and beneath the indent could be observed during loading and unloading process by using the in. situ Brinell indentation method.

Phase equilibrium between bcc solid solution matrix, B2 aluminides and Laves phase in Nb-based alloy　　　　　　　　　　　　　　　
Takuya Yamanouchi, Seiji Miura
The proceedings of The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9), 784, 787, 2016年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Fracture toughness of Al3Nb evaluated by micro-size fracture testing　　　　　　　　　　　　　　　
Nobuhiro Matsuzaki, Seiji Miura
The proceedings of The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9), 788, 790, 2016年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

The isothermal sections of Mg-Zn-Gd ternary system in the vicinity of LPSO phase　　　　　　　　　　　　　　　
Futoshi Miyakawa, Seiji Miura, Ken-ichi Ikeda
The proceedings of The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9), 814, 817, 2016年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Factors controlling pseudoelasticity of Mg alloys　　　　　　　　　　　　　　　
Takahiro Mineta, Seiji Miura, Ken-ichi Ikeda
The proceedings of The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9), 810, 813, 2016年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Investigation of substitutional behavior of rare-earth elements in LPSO phases　　　　　　　　　　　　　　　
Seiji Miura, Futoshi Miyakawa, Ken-ichi Ikeda, Toshiaki Horiuchi, Takaomi Itoi, Satoshi Minamoto
LPSO2016, ORAL - 02, 2016年
英語, 研究論文（国際会議プロシーディングス）

Comparison with the composition dependence of the LPSO poly-types formed in Mg-M-Y (M=Ni, Cu and Zn) ternary alloy systems　　　　　　　　　　　　　　　
Takaomi Itoi, Takuya Ogaku, Atsushi Seo, Toshiaki Horiuchi, Seiji Miura
LPSO2016, POS – 04, 2016年
英語, 研究論文（国際会議プロシーディングス）

Deformation and fracture behavior of Ti3SiC2 ceramics by four-point bending test using a thin sheet　　　　　　　　　　　　　　　
Ken-ichi Ikeda, Seiji Miura
LPSO2016, POS-23, 2016年
英語, 研究論文（国際会議プロシーディングス）

Refinement of Thermodynamic Parameters of the Mg24Y5, W and H Phases in the Mg-Zn-Y System
Satoshi Minamoto, Toshiaki Horiuchi, Seiji Miura
MATERIALS TRANSACTIONS, 56, 10, 60, 64, JAPAN INST METALS, 2015年10月, ［査読有り］
英語, 研究論文（学術雑誌）, The Mg-Zn-Y alloy shows excellent mechanical properties which can be achieved by combining LPSO phase (known as X phase) and an icosahedral quasicrystal phase (land Z phases) in Mg solid solution (a phase). Thermodynamic data for the binary/ternary compounds Mg24Y5, X, Wand H have to be critically assessed to obtain accurate information of three-phase equilibrium in order to understand equilibria among these phases. In this research, we focused on developing CALPHAD (CALculation of PHAse Diagrams) thermodynamic database to evaluate phase diagrams for the Mg-Zn-Y system. Especially thermodynamic models for the Mg24Y5, W and H phases have been determined based on crystallographic data. Then thermodynamic parameters have been assessed to yield experimental data from EPMA/WDS, SEM, TEM and X-Ray diffraction.

Effect of (Ti:B) atomic ratio on mechanical properties of TiB₂-Fe composites "in situ" fabricated via Self-propagating High-temperature Synthesis
Marta Ziemnicka-Sylwester, Li Gai, Seiji Miura
Materials and Design, 69, 1, 11, Elsevier Ltd, 2015年03月15日, ［査読有り］, ［最終著者］
英語, 研究論文（学術雑誌）, The TiB2-based Fe-matrix cermets with titanium addition (literarily different Ti:B ratio) were fabricated from elemental powders "in situ" using the Self-propagating High-temperature Synthesis method (SHS) under high pressure. The effect of Ti:B ratio on microstructure and phase composition with particular focus on matrix phase were analyzed using X-ray diffraction (XRD) and Wavelength Dispersive Spectroscopy (WDS) for composites with intended 25vol.% and 35vol.% of Fe. Moreover, for composites with 35vol.% of Fe bending strength and compressive strength were investigated. The compressive strength reached maximum value in material with Ti:B atomic ratio of 0.49, which possessed the highest TiB2 content and matrix phase consisting of Fe and Fe2B. However, modulus of rupture (MOR) test indicated that composite with titanium excess (Ti:B atomic ratio of 0.525) was characterized by the highest bending strength, due to successful elimination of Fe2B intermetallics.

Microstructural characterization of a new mechanically alloyed Ni-base ODS superalloy powder
S. M. Seyyed Aghamiri, H. R. Shahverdi, S. Ukai, N. Oono, K. Taya, S. Miura, S. Hayashi, T. Okuda
MATERIALS CHARACTERIZATION, 100, 135, 142, ELSEVIER SCIENCE INC, 2015年02月, ［査読有り］
英語, 研究論文（学術雑誌）, The microstructure of a new Ni-base oxide dispersion strengthened superalloy powder was studied for high temperature gas turbine.applications after the mechanical alloying process. In this study, an atomized powder with a composition similar to the CMSX-10 superalloy was mechanically alloyed with yttria and Hf powders. The mechanically alloyed powder included only the supersaturated solid solution gamma phase without gamma' and yttria provided by severe plastic deformation, while after the 3-step aging, the gamma' phase was precipitated due to the partitioning of Al and Ta to the gamma' and Co, Cr, Re, W, and Mo to the gamma phase. Mechanical alloying modified the morphology of gamma' to the new coherent gamma-gamma' nanoscale lamellar structure to minimize the elastic strain energy of the precipitation, which yielded a low lattice misfit of 0.16% at high temperature. The gamma' lamellae aligned preferentially along the elastically soft [100] direction. Also, the precipitated oxide particles were refined in the gamma phase by adding Hf from large incoherent YAlO3 to fine semi-coherent Y2Hf2O7 oxide particles with the average size of 7 nm and low interparticle spacing of 76 nm. (C) 2014 Elsevier Inc All rights reserved.

Phase equilibrium between bcc solid solution matrix and B2 aluminides in Nb-based alloy
Takuya Yamanouchi, Seiji Miura
Materials Research Society Symposium Proceedings, 1760, 199, 204, Materials Research Society, 2015年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, B2 aluminides have a role of Al reservoir for Al<
inf>
2<
/inf>
O<
inf>
3<
/inf>
surface and it is expected to increase oxidation resistance of (Nb,Mo)-bcc<
inf>
ss<
/inf>
substrate. For the accumulation of the basic information to design the alloy composed of B2 coating on bcc<
inf>
ss<
/inf>
matrix, bcc<
inf>
ss<
/inf>
- B2 two-phase field was investigated in the Nb-Mo-Ni-Pd-Al system at 1273 K. It is found that Pd-rich B2-(Ni,Pd)Al phase is in equilibrium with Nb-rich bcc<
inf>
ss<
/inf>
phase, while without Pd, the composition range of bcc<
inf>
ss<
/inf>
coexisting with B2-NiAl phase is limited to be low Nb.

Evaluation of fracture toughness of alpha-Nb<inf>5</inf>Si<inf>3</inf> by micro-sized cantilever beam testing
Shiori Suzuki, Nobuaki Sekido, Takahito Ohmura, Seiji Miura
Materials Research Society Symposium Proceedings, 1760, 187, 192, Materials Research Society, 2015年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, A micro-sized fracture testing method has been applied to investigate fracture toughness of alpha-Nb<
inf>
5<
/inf>
Si<
inf>
3<
/inf>
. Chevron-notched single crystal specimens with a size of 3 × 3 × 15 μm<
sup>
3<
/sup>
were prepared in a grain of polycrystalline alpha-Nb<
inf>
5<
/inf>
Si<
inf>
3<
/inf>
by focused ion beam, FIB, technique. Fracture tests were conducted using a nanoindenter at room temperature and linear load-displacement curves and smooth fracture surfaces were obtained. This fracture behavior was presumed to be brittle fracture similar to bulk alpha-Nb<
inf>
5<
/inf>
Si<
inf>
3<
/inf>
. The average of fracture toughness K<
inf>
q<
/inf>
is 3.45 ± 0.29 MPa√m under a small-scale yielding condition.

Evaluation of Critical Resolved Shear Stresses for various plastic deformation mechanisms to understand mechanical properties of magnesium-yttrium alloys
T. Mineta, S. Miura
Materials Research Society Symposium Proceedings, 1741, January, 47, 52, Materials Research Society, 2015年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, In order to understand enhanced mechanical properties of magnesium-yttrium (Mg-Y) alloys, applied stresses which were required to operate independent plastic deformation mechanisms on various stress axes were evaluated. Moreover, for this analysis, mechanical tests including newly-established testing method "pure-shear test" were conducted to evaluate Critical Resolved Shear Stresses (CRSSes) for various plastic deformation mechanisms of Mg-Y solid solution alloy single crystals with various Y concentration. Relatively higher solid solution strengthening of dominant plastic deformation mechanisms such as basal slip and extension twin at room temperature, results in increase in the activation of non-basal slip system. By a simple analysis based on von-Mises criterion with experimental CRSS values, it is revealed that enhanced mechanical properties of Mg-Y alloys might be attributed to the decrease of difference in the activity of plastic deformation mechanisms by Y addition.

Thermal stability of Mg-Zn-Y LPSO phases and revised thermodynamic description of the Mg-Zn-Y phase diagram　　　　　　　　　　　　　　　
Rainer Schmid-Fetzer, Joachim Groebner, Michiaki Yamasaki, Yoshihito Kawamura, Hiroshi Okuda, Seiji Miura, Toshiaki Horiuchi, Jian-Feng Nie
2015 Mg proceedings, EO-3-0372, 2015年, ［招待有り］
英語, 研究論文（国際会議プロシーディングス）

The phase equilibrium in the vicinity of LPSO phase in Mg-Zn-Gd ternary system　　　　　　　　　　　　　　　
Futoshi Miyakawa, Ken-ichi Ikeda, Seiji Miura, Toshiaki Horiuchi, Satoshi Minamoto
2015 Mg proceedings, 345, 349, 2015年
英語, 研究論文（国際会議プロシーディングス）

Deformation behavior of LPSO phase in Mg-Zn-Y alloy by four-point bending test using a thin sheet　　　　　　　　　　　　　　　
K. Ikeda, R. Nishio, H. Gao, S. Hata, H. Nakashima, S. Miura
2015 Mg proceedings, EO-4-1241, 2015年
英語, 研究論文（国際会議プロシーディングス）

A Quantitative Evaluation of Phase Field Microstructure by the Spectral Analysis
Kenji Iseya, Seiji Miura, Tetsuo Mohri
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, 35, 6, 788, 793, SPRINGER, 2014年12月, ［査読有り］
英語, 研究論文（学術雑誌）, Two-phase microstructure calculated by Phase Field calculations is perturbed by Gaussian filtration processes to produce a series of deteriorated images. Fourier spectral analysis is, then, performed on the resultant images to derive information of spatial distribution of phases consisting of the microstructure. It is shown that Fourier spectrum is correlated with characteristic length involved in the microstructure. By inverting a particular spectrum peak, one can estimate the spatial distribution of a particular phase.

接着強さに及ぼす表面性状のフーリエ変換による影響解析
垂水 良悦, 山賀 英司, 坂口 紀史, 三浦 誠司, 亘理 文夫
北海道外科雑誌, 59, 1, 92, 92, 北海道外科学会, 2014年06月
日本語

Effect of Alloying Elements on Nb-Rich Portion of Nb-Si-X Ternary Systems and In Situ Crack Observation of Nb-Si-Based Alloys
Seiji Miura, Toru Hatabata, Takuya Okawa, Tetsuo Mohri
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 45A, 3, 1136, 1147, SPRINGER, 2014年03月, ［査読有り］
英語, 研究論文（学術雑誌）, To find a new route for microstructure control and to find additive elements beneficial for improving high-temperature strength, a systematic investigation is performed on hypoeutectic Nb-15 at. pct Si-X ternary alloys containing a transition element, Fe, Co, Ni, Cu, Ru, Rh, Pd, Re, Os, Ir, Pt, or Au. Information on phase equilibrium is classified in terms of phase stability of silicide phases, alpha Nb5Si3, Nb4SiX, and Nb3Si, and the relationship between microstructure and mechanical properties both at room temperature and high temperature is investigated. All the additive elements are found to stabilize either alpha Nb5Si3 or Nb4SiX but destabilize Nb3Si. A microstructure of Nb-ss/alpha Nb5Si3 alloy composed of spheroidized alpha Nb5Si3 phase embedded in the Nb-ss matrix is effective for toughening, regardless of the initial as-cast microstructure. Also the plastic deformation of Nb-ss dendrites may effectively suppress the propagation of longer cracks. High-temperature strength of alloys is governed by the deformation of Nb-ss phase and increases with higher melting point additives.

Phase equilibrium between B2 Aluminide NiAl and Nb-Mo bcc solid solution phase
Seiji Miura, Yoshihito Sekito, Takuya Okawa, Takuya Yamanouchi, Tetsuo Mohri
Materials Science Forum, 783-786, 1171, 1175, 2014年, ［招待有り］
英語, 研究論文（国際会議プロシーディングス）

Composition dependence of phase transformation behavior and shape memory effect of Ti(Pt,Ir)
御手洗 容子, Mitarai(Yamabe) Yoko, 細田 秀樹, HOSODA Hideki
Journal of Alloys and Compounds, 577, 577, Elsevier B.V., 2013年11月
英語, The phase transformation and high-temperature shape memory effect of Ti(Pt, Ir) were investigated. First, the Ti-rich phase boundary of Ti(Pt, Ir) was investigated by phase composition analysis by secondary electron microscopy (SEM) using an electron probe X-ray micro analyzer (EPMA), X-ray diffraction analysis and transmission electron microscopy (TEM). Then, the three alloys Ti-35Pt-10Ir, Ti-22Pt-22Ir, and Ti-10Pt-32Ir (at%) close to the phase boundary but in the single phase of Ti(Pt, Ir) were prepared by the arc melting method. The shape memory effect and crystal structure were investigated by compression loading-unloading tests and high-temperature X-ray diffraction analysis, respectively. © 2012 Elsevier B.V.

純せん断試験によるMg単結晶の非底面すべり挙動評価法確立とY添加の影響
峯田 才寛, 三浦 誠司, 向井 敏司
日本金属学会誌 = Journal of the Japan Institute of Metals and Materials, 77, 10, 466, 472, 日本金属学会 ; 1937-, 2013年10月, ［査読有り］
日本語, 研究論文（学術雑誌）, In Mg alloys, the most favorable deformation mechanism is the basal slip, and extension twinning also contributes to plastic deformation. Other mechanisms such as prismatic slips, pyramidal slips and twinning except for extension twinning scarcely occur. However, these slip systems also contribute to the plastic deformation of poly crystal Mg alloys, so the determination of CRSS of such non-basal slip systems are inevitable as a basis for the prediction of the deformation behavior of poly-crystal Mg alloys. Because of the difficulty of the evaluation of CRSS for non-basal slip by conventional compression test, newly designed "Pure shear test" is applied to evaluate the CRSS of the prismatic slip Mg alloy single crystals containing Y. Also a modification of Bridgman method using LiF + LiCl is attempted to obtain a pure-Mg single crystal.

Experimental Study on Phase Equilibria in the Vicinity of X, W and H Phases in the Mg-Zn-Y Ternary System
Atsushi Hamaya, Toshiaki Horiuchi, Yuki Oohira, Satoshi Minamoto, Seiji Miura, Norihito Sakaguchi
MATERIALS TRANSACTIONS, 54, 5, 641, 646, JAPAN INST METALS & MATERIALS, 2013年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Three Mg-Zn-Y ternary alloys in the vicinity of X, Wand H phases were prepared and were isothermally heat treated at 833, 793, 723 and 673K to attain thermodynamic equilibrium. The microstructure was observed using electron probe microanalysis and transmission electron microscopy, and the chemical compositions of the equilibrium phases were analyzed using wavelength dispersive X-ray spectroscopy. The crystal structure of the Wand H phases were analyzed using X-ray diffraction, electron back scattering diffraction and electron diffraction pattern obtained by transmission electron microscopy. The Mg-Zn-Y ternary phase diagrams of the isothermal section were also calculated using the Thermo-Calc to compare with the experimental results. The X phase was found to be solidified in high-Mg alloys not in a manner of eutectic reaction as reported previously but in a manner of peritectic reaction. The W phase has a Heusler (L2(1)) type crystal structure with a stoichiometric composition of Mg1Zn2Y1, and fine mesh texture composed of alpha (Mg) and W phases was occasionally observed in non-equilibrium solidified parts, implying that the transient W phase has potential to be utilized as an additional strengthening phase. The equilibrium chemical composition of the H phase with a hexagonal crystal structure (P6(3)/mmc) was found to be different from that of the previous reports.

Structure Consideration of Platinum Nanoparticles Constructing Nanostructures Obtained by Electrochemical Dealloying of a Cu-Pt Alloy
Kazuki Maruya, Ryoji Yamauchi, Takashi Narushima, Seiji Miura, Tetsu Yonezawa
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 13, 4, 2999, 3003, AMER SCIENTIFIC PUBLISHERS, 2013年04月, ［査読有り］
英語, 研究論文（学術雑誌）, Many nanoporous metals have been applied for catalysis and show active properties. In this study, nanoporous platinum was successfully prepared from a Cu-Pt (50/50 w/w) alloy plate by electrochemical dealloying. In order to reveal their detailed structures in nanometer order, TEM observation of the surface area of the alloy plate was performed by using focused ion beam (FIB) for sample preparation. Peeling off the surface platinum nanoparticles could be also successfully preformed by using ultra sonification and their TEM observation revealed the units of the platinum nanoporous. structures.

Heterogeneous Nucleation of Pure Magnesium on Al3Ti, TiC, TiB2, and AlB2 Particles
Yoshimi Watanabe, Yan Bing Gao, Jun Qing Guo, Hisashi Sato, Seiji Miura, Hiromi Miura
JAPANESE JOURNAL OF APPLIED PHYSICS, 52, 1, 01AN04.1-01AN04.7, IOP PUBLISHING LTD, 2013年01月, ［査読有り］
英語, 研究論文（学術雑誌）, In this study, experiments were performed to clarify the grain-refining mechanisms of pure Mg cast by adding some grain refiners containing Al3Ti, TiC, TiB2, and AlB2 particles as heterogeneous nucleation sites. It is found that Al-5mass% Ti, Al-3mass% Ti-0.15mass% C, Al-5mass% Ti-0.2mass% B, and Al-5mass% Ti-1mass% B alloys are effective grain refiners for pure Mg, as well as for pure Al and Al alloys. The favourable heterogeneous nucleation sites in these refiners are considered to be TiC, TiB2, and AlB2 particles. (C) 2013 The Japan Society of Applied Physics

Microstructure control of Nb-Si based alloys with Cr, W, Ta and Zr by using Nb3Si phase stability control
Yuting Wang, Seiji Miura, Akira Yoshinari
Materials Research Society Symposium Proceedings, 1516, 109, 114, 2013年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, Recently, Nb-Si based alloys have attracted considerable attention as potential candidate materials for ultra-high temperature applications, because of their low densities and high melting points. However, it is still very difficult to obtain materials with a good balance of high-temperature strength and room-temperature toughness. To address this issue, microstructure control is considered to be a promising method. In applying microstructure control to Nb-Si based alloys with a eutectic reaction (L → Nbss + Nb 3Si) and a eutectoid reaction (Nb3Si → Nb ss + Nb5Si3), the key is the control of Nb 3Si phase stability. Nb55(Nb solid solution) is considered as a ductile phase. In previous reports, it was revealed that different elements had different effects on the stability of Nb3Si. In particular, Mo and W (>
3 at %) destabilize the Nb3Si phase, while Ti and Ta stabilize it, and Zr acts as an accelerator for decomposition of Nb3Si. On the other hand, Cr is known to enhance the formation of the ductile Nb55 phase. In the present study, we investigated the effects of adding combinations of stabilizing, destabilizing, and accelerating elements with Cr, such as Cr and W, Cr and Ta, Cr and Zr. According to SEM observation, different microstructures were obtained with different combination of additives, and the fracture toughness at room temperature of these samples were also evaluated to reveal the effects of the microstructure on the mechanical properties of Nb-Si based alloys. © 2012 Materials Research Society.

Effects of the microstructure and minor elements on the fracture toughness of Nb-Si alloy
Takuya Okawa, Seiji Miura, Tetsuo Mohri
Materials Research Society Symposium Proceedings, 1516, 163, 167, 2013年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, The development of a new high temperature structural material is recently required in various fields. As one of the potential materials, Nb-Si alloys have attracted attention due to their high melting point and low density. A microstructure composed of ductile Nb matrix containing finely dispersed spherical ND5Si3 phase is obtained by the addition of ternary elements such as Au and it is found that such microstructure is effective in improving room temperature toughness. The main purpose of the present study is evaluating fracture toughness of Nb-Si-Au alloys using small specimens and investigating the effects of the microstructure and other minor elements on the fracture toughness. Alloy ingots of Nb-15at.%Si-3at.%Au and Nb-3at.%Au are prepared by arc-melting under Ar atmosphere, followed by heat-treatments at up to 1500°C for 100 hours. Chevron notched specimens with a size of 1.0x2.0x 10mm are subjected to four-point bending tests under a laser confocal microscope for in-situ observation of crack propagation, and the effect of the microstructure and minor elements such as oxygen on the evaluated fracture toughness is investigated on both the Nb/Nb5Si3 alloys and the Nb solid solution (Nbss) alloys. ©2012 Materials Research Society.

DIRECT AND INDIRECT EFFECTS OF THE ALLOYING ELEMENTS ON THE MECHANICAL PROPERTIES OF NB-SI ALLOY　　　　　　　　　　　　　　　
MIURA Seiji
An ECI (Engineering Conferences International) Conference proceedings, 2013年
英語, 研究論文（国際会議プロシーディングス）

Phase Transformation and Shape Memory Effect of Ti(Pt, Ir)
Yoko Yamabe-Mitarai, Toru Hara, Seiji Miura, Hideki Hosoda
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 43A, 8, 2901, 2911, SPRINGER, 2012年08月, ［査読有り］
英語, 研究論文（学術雑誌）, The martensitic transformation and shape memory effect of Ti-50(Pt, Ir)(50) with 5-37.5 at. pct Ir were investigated using differential thermal analysis (DTA), high-temperature X-ray diffraction (HT-XRD), and compression tests. The austenite finish temperature, A (f), increased with increasing Ir content from 1331 K (1058 A degrees C) in Ti-50 at. pct Pt to 1491 K (1218 A degrees C) in Ti-12.5Pt-37.5Ir. The structure of the parent and martensite phases was identified as B2 and B19 in all tested alloys. A large strain recovery rate was obtained in Ti-50(Pt, Ir)(50) with 10 to 30 at. pct Ir. The highest shape recovery ratio was 57 pct in Ti-25Pt-25Ir after deformation at 1123 K (850 A degrees C), followed by heating to above A (f). Using HT-XRD, the dependence of lattice parameter change on Ir content and temperature was investigated. The volume change during phase transformation from B2 to B19 was estimated using the lattice parameter of the B2 and B19 phases. Strain recovery is discussed along with volume change and lattice parameter change.

Experimental Study on Phase Diagram in the Vicinity of X or W Phase in the Mg-Zn-Y Ternary System
T. Horiuchi, H. Ikee, A. Hamaya, S. Minamoto, S. Nomoto, S. Miura
THERMEC 2011, PTS 1-4, 706-709, 1170, +, TRANS TECH PUBLICATIONS LTD, 2012年, ［招待有り］
英語, 研究論文（国際会議プロシーディングス）, To elucidate the phase equilibria in the vicinity of the X or W phase in the Mg-Zn-Y ternary system, five Mg-Zn-Y ternary alloys containing the X or W phase were prepared and isothermally heat-treated to reach thermodynamic equilibrium. The microstructure and chemical compositions of the equilibrium phases of the alloys were analyzed. Furthermore, the crystal structure of the W phase was investigated, and the liquidus temperatures of the alloys were examined using differential thermal analysis. The results showed that the X phase can be crystallized not by a eutectic reaction, as reported previously, but by a peritectic reaction. They also showed that the W phase has the Heusler-type crystal structure with a stoichiometric composition of Mg1Zn2Y1, and that Mg and Zn in the W phase can be substituted for each other. The Mg-Zn-Y ternary phase diagram was calculated using an assessed CALPHAD thermodynamic database based on the experimental results of the present study, and compared with a recently reported phase diagram.

Effect of alloying elements on the shape of Nb silicide embedded in Nb matrix　　　　　　　　　　　　　　　
Seiji Miura, Toru Hatabata, Tetsuo Mohri
Plasticity 2012 proceeding(CD-ROM), 118, 120, 2012年, ［査読有り］, ［招待有り］
英語, 研究論文（国際会議プロシーディングス）

Effect of Al3Ti, TiC and TiB2 Particles on the Grain Refinement of Pure Magnesium　　　　　　　　　　　　　　　
Yoshimi Watanabe, Yan Bing Gao, Jun Qing Guo, Hisashi Sato, Seiji Miura, Hiromi Miura
ISPlasma2012, 182, 182, 2012年
英語, 研究論文（国際会議プロシーディングス）

Mechanical properties of Nb-Si based alloys with microstructure modified by applying phase stability concept　　　　　　　　　　　　　　　
Seiji Miura, Tatsuichi Tanahashi, Tetsuo Mohri
Creep 2012/JIMIS 11, 12th International conference on Creep and Fracture of Engineering Materials and Structures, Proceedings, D11, 2012年, ［査読有り］, ［招待有り］
英語, 研究論文（国際会議プロシーディングス）

In situ crack observation of unidirectionally solidified Nb-Si based alloys　　　　　　　　　　　　　　　
T. Hatabata, S.Miura, T. Mohri
Creep 2012/JIMIS 11, 12th International conference on Creep and Fracture of Engineering Materials and Structures, Proceedings, D12, 2012年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Mechanical properties of directionally solidified Nb-Mo-Si-based alloys with aligned Nb-SS/Nb5Si3 lamellar structure
Yulong Li, Chaoli Ma, Hu Zhang, Seiji Miura
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 528, 18, 5772, 5777, ELSEVIER SCIENCE SA, 2011年07月, ［査読有り］
英語, 研究論文（学術雑誌）, The room-temperature fracture toughness and high-temperature compression strength are investigated in directionally solidified Nb-Mo-Si-based alloys with aligned Nb-ss/Nb5Si3 lamellar structure. The fracture toughness is higher as grain size is reduced or annealing at 1300 degrees C for 100 h is applied. The normalized work of rupture (chi) in the in situ Nb-ss/Nb5Si3 lamellar structure is modeled and calculated to range from 0.10 to 0.38. Besides, the Nb-ss and Nb5Si3 are firmly connected on the fracture surface. Thus, the Nb-ss/Nb5Si3 interface is strongly bonded. Either reducing interface toughness or enhancing Nb-ss toughness is advantageous for interface decohesion. In the annealed Nb-17Si-10Mo-0.1Ga alloy, a small amount of Nb-ss/Nb5Si3 interface decohesion is observed because the annealing increases the toughness of Nbss. At 1250 degrees C and 1350 degrees C, the maximum compression strength is 620 MPa and 520 MPa, respectively. (C) 2011 Elsevier B.V. All rights reserved.

Ultrahigh-temperature Nb-SS/Nb5Si3 fully-lamellar microstructure developed by directional solidification in OFZ furnace
Yulong Li, Seiji Miura, Kenichi Ohsasa, Chaoli Ma, Hu Zhang
INTERMETALLICS, 19, 4, 460, 469, ELSEVIER SCI LTD, 2011年04月, ［査読有り］
英語, 研究論文（学術雑誌）, Directional solidification in an optical floating zone furnace was employed to develop a fully-lamellar Nb-SS/Nb5Si3 structure for ingots having a composition of Nb-17Si-10Mo-3Al. It was determined that beta-Nb5Si3 is a faceted phase through the estimation of the entropy of melting and that the Nb-SS/beta-Nb5Si3 eutectic has a non-faceted/faceted structure, in which the microstructure is thought to be sensitive to growth conditions such as growth rate and rod-rotation speed. In the absence of the rotation speed of the seed rod, a fully-lamellar Nb-SS/beta-Nb5Si3 structure was obtained for growth rates below 10 mm/h. The relationship between lamellar spacing and growth rate was in agreement with the Jackson Hunt theory with lambda R-2 = 170 mu m(2) mm/h in this alloy. Electron backscatter diffraction analysis on both Nb-17Si-10Mo-3Al alloy and Nb-18Si-10Mo alloys revealed that the crystallographic orientation relationship in the as-grown Nb-SS/beta-Nb5Si3 lamellae was {112}(NbSS)//{100}(beta-Nb5Si3) and < 113 >(NbSS)//[001](beta-Nb5Si3). No preferred crystallographic orientation relationship was identified between either beta-Nb5Si3 or Nb-SS and alpha-Nb5Si3, but the Nb-SS/alpha-Nb5Si3 lamellar structure exhibited good stability at high temperature. It was inferred that one beta-Nb5Si3 may nucleate with several Nb-SS nucleation supposedly at the interface between the liquid and beta-Nb5Si3. (C) 2010 Elsevier Ltd. All rights reserved.

In-situ observation of Nb/Nb5Si3 two-phase alloys during bending at various temperatures
Seiji Miura, Yukiyoshi Tsutsumi, Tetsuo Mohri
Materials Research Society Symposium Proceedings, 1295, 373, 378, 2011年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, In order to understand the deformation and fracture behavior of Nb-Si alloys, in-situ observation was conducted during bending of small specimens at room and high temperatures. Nb-Si alloy ingots containing 18.1 at.%Si, 1.5 at.%Zr and 100 ppmMg were prepared by arc melting, followed by uni-axial solidification in an optical floating zone apparatus and a heat-treatment to obtain Nb/Nb5Si3 two-phase microstructure. Chevron-notched specimens with a dimension of 1x2x10mm were used for in-situ observation of bending tests under a confocal laser scanning microscope (CLSM) at room temperature and at 1140°C. At room temperature the Nb-Si alloy shows a fracture toughness of 8 MPa m1/2 and the crack propagation velocity seems to be not uniform, presumably due to the ductile Nb. At 1140°C the toughness of the alloy was about 20 MPa m1/2 and slower plastic deformation prior to the cracking was observed. The SEM observation of crack surfaces revealed that plastic deformation of Nb enhances the toughness of the alloy. © 2011 Materials Research Society.

Effects of additives on the phase stability of Nb3Si intermetallic compound and mechanical properties of Nb-Si alloy
Tatsuichi Tanahashi, Seiji Miura, Tetsuo Mohri
Materials Research Society Symposium Proceedings, 1295, 207, 212, 2011年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, Recently, Nb-Si alloys have attracted attentions as substitutional materials of Ni-based superalloys because of its low density and high melting point. For attaining good room temperature toughness of Nb-Si alloys, proposed is a microstructure-control technique by combining eutectic reaction (L->
Nb+Nb3Si) and eutectoid reaction (Nb3Si->
Nb+ Nb5Si3) for spheroidizing Nb5Si3 strengthening phase embedded in Nb matrix [1]. For the solid solution strengthening of Nb matrix phase W and Mo are very effective, but Nb 3Si phase disappears by adding these elements of as small as 3 at%. In contrast, Ti and Ta stabilize Nb3Si phase. For a further alloy development, establishment of an alloy design based on the control of phase stability of Nb3Si is needed. In the previous study [2], it was revealed that the phase stability of Nb3Si can be controlled by selecting appropriate Ta/Mo ratio. In the present study, this approach is expanded to other combinations of stabilizing and destabilizing elements of Nb3Si, such as Ti and W, Ta and W, and Ti and Mo. Vickers hardness tests were conducted on the heat-treated samples to reveal effects of additives on mechanical properties of Nb-Si alloy. © 2011 Materials Research Society.

Binding Energy of Carbon Implanted into Hematite and in situ Observation of Reaction Behavior during Heating Up Experiment
Yoshiaki Kashiwaya, Tsuyoshi Nakamitsu, Hiroshi Kinoshita, Seiji Miura
ISIJ INTERNATIONAL, 51, 8, 1204, 1212, IRON STEEL INST JAPAN KEIDANREN KAIKAN, 2011年, ［査読有り］
英語, 研究論文（学術雑誌）, It is widely known that the direct contact between solid carbon and iron oxide shows quite a fast reduction rate in comparison with CO gas reduction. However, it is difficult to sustain the physical contact between solid carbon and iron oxide. Furthermore, the contact mode will be different from the production method, which will affect the reaction kinetics strongly.
In this study, different kinds of contacts between solid carbon and hematite were made to clarify the reaction mechanism. One contact mode is the deposition of the carbon layer on the hematite surface using a vacuum evaporation method. Another method is the implantation of carbon ions into hematite. Using XPS (X-ray photoelectron spectroscopy), the binding energy of Fe-O-C was measured. Heating under an argon atmosphere was carried out. Both samples showed quite different reaction behavior, though the temperature at the beginning of the reduction reaction was almost the same. From these results, it was determined that the position of carbon will change the reaction behavior drastically, because it is important how the CO gas escapes from the reaction site.

Shape memory effect and pseudoelasticity of TiPt
Y. Yamabe-Mitarai, T. Hara, S. Miura, H. Hosoda
INTERMETALLICS, 18, 12, 2275, 2280, ELSEVIER SCI LTD, 2010年12月, ［査読有り］
英語, 研究論文（学術雑誌）, Martensitic transformation behavior and shape memory properties of Ti-50at%Pt were investigated using high-temperature X-ray diffractometry and loading-unloading compression tests. The structure of the parent and martensite phases was identified as 132 and B19, respectively. Changes in the lattice parameters of the martensite phase were investigated as a function of temperature. Applying the lattice parameter changes, the volume strain between 819 and B2 phases at 1473 K was estimated at 2.5%. The compression test was carried out at room temperature and at 1123 K. Strain was precisely measured using a strain gage for the test at room temperature and a CCD camera for the test at 1123 K. Strain recovery was observed during unloading at room temperature and at 1123 K, which was below the martensite temperature. Shape recovery was investigated for the samples tested at room temperature and at 1123 K by heating at 1523 K for 1 h. It was found that the strain recovery rate was 30-60% for the samples tested at room temperature and about 11% for the samples tested at 1123 K. (C) 2010 Elsevier Ltd. All rights reserved.

酸化鉄触媒添加コークスの反応挙動
山本 雄一郎, 柏谷 悦章, 三浦 誠司, 西村 勝, 加藤 健次, 野村 誠治, 窪田 征弘, 国友 和也, 内藤 誠章
鉄と鋼, 96, 5, 104, 112, IRON STEEL INST JAPAN KEIDANREN KAIKAN, 2010年05月, ［査読有り］
日本語, 研究論文（学術雑誌）, The performance of coke in blast furnace (BF) used to prefer a high strength and low reactivity, generally, while the high reactivity coke commonly has a low strength. To overcome the contradiction, we are going to use the catalytic effect on the coke gasification. It is important to clarify the mechanism of coke gasification concerning to the coke microstructure and pore. In this study, the coke gasification was analyzed using mu-X-ray CT (Computed Tomography). The optimum conditions for the image processing of the data from the X-ray CT were obtained through the comparison with the cross section of the coke embedded in a resin. Nondestructive observation became possible. To improve resolution of the nondestructive observation, the sample shape was changed from spherical to cylindrical one and the observation conditions were adjusted to an optimum one. It was found that the resolution of the nondestructive observation of cylindrical sample was better than that of spherical sample. Using high precision mu-X-ray CT, the position of the catalyst added and the reaction behavior became clear. Furthermore, using new developed image processing of the data from the mu-X-ray CT, macroscopic reaction behavior of the catalyst became clear.

Dislocation Character And Operative Slip Systems In α–Nb₅Si₃ Tested At 1673 K
N.Sekido, S.Miura, Y.Yamabe-Mitarai, Y.Kimura, Y.Mishima
Intermetallics, 18, 5, 841, 845, ELSEVIER SCI LTD, 2010年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Dislocation character and operative slip systems in alpha-Nb5Si3 were examined by transmission electron microscopy. Two-phase alloys comprised of (Nb) and alpha-Nb5Si3 were used in this study. Although few dislocations were present in the alpha-Nb5Si3 phase of a pre-deformed alloy, many developed after 15% of compressive deformation at 1673 K. Two types of the Burgers vectors were identified for alpha-Nb5Si3: <100] and 1/2 < 111]. The glide planes of dislocations were defined by the cross products between the Burgers vectors and the line vectors of the dislocations, by which the slip systems that operate in alpha-Nb5Si3 at 1673 K were determined as {011)<111], {100)<010], and {001)<100]. (C) 2009 Elsevier Ltd. All rights reserved.

コークス中に添加された酸化鉄触媒のその場観察と反応機構
山本雄一郎, 柏谷悦章, 三浦誠司, 西村勝, 加藤健次, 野村誠治, 窪田征弘, 国友和也, 内藤誠章
鉄と鋼, 96, 5, 113, 120, IRON STEEL INST JAPAN KEIDANREN KAIKAN, 2010年05月, ［査読有り］
日本語, 研究論文（学術雑誌）, The performance of coke in blast furnace (BF) used to prefer a high strength and low reactivity, generally, while the high reactivity coke commonly has a low strength. To overcome the contradiction, it is important to develop a catalyst to increase the reactivity of carbon, so that the reaction mode can be changed from chemical reaction control to diffusion control. In this study, the reaction behavior of a ferro-coke was investigated, in which an iron oxide were added into a raw coal. Using high temperature laser microscope, in situ observation was carried out with the ferro-coke sample ground into tetragonal shape with 3.4 x 3.4 x 2.2 mm. Behavior of catalyst in coke was clarified through the in situ observations. It was found that the temperature at peak of reaction without catalyst was 1270 degrees C, while the coke with catalyst showed two peaks at 900 degrees C and 1270 degrees C. It was considered that redox reactions would exist in the system. The mechanism of redox reaction is shown as Eqs. (1), (2) and (3), mainly.FeO(melt) + C = Fe + CO (1)FeO(melt) + CO= Fe +CO2 (2)Fe + CO2 = FeO(melt) + CO (3)On the other hand, the coke gasification was analyzed using high precision mu-X-ray CT. The optimum conditions for the image processing of data from the mu-X-ray CT were obtained through the comparison with the cross section image of the coke embedded in the resin. Because of the smaller sample than the previous study, higher precision analysis was able to carry out.

Effect of Cold Rolling on Passive Film on Pure Iron in pH 8.4 Borate Buffer Solution
T. Yamamoto, K. Fushimi, S. Miura, H. Konno
OXIDE FILMS, 25, 40, 3, 15, ELECTROCHEMICAL SOC INC, 2010年
英語, 研究論文（国際会議プロシーディングス）, The influence of substrate dislocations on passivation behavior of a pure iron in pH 8.4 borate buffer solution was investigated. Cold rolling was employed to induce dislocation in the annealed substrate. The dislocation density on the cold rolled substrate depended on the reduction ratio (Red) and was maximum at Red = 60%. The electric charge consumed in the passivation and the passivity-maintaining current increased with increase in the dislocation density. EIS revealed that the dislocation exposed to the iron surface increased donor density in the passive film and reduced charge transfer resistance for the film aging. It was also demonstrated by rf-GDOES that a thick passive film formed on the cold rolled iron compared with that on annealed iron. These results suggest that substrate dislocations enhance the reactions at the substrate/film interface, resulting in the formation of the highly defective passive film.

Microstructure! Characterization of Nb-Al Base ODS Alloys
Shigeharu Ukai, Akinobu Minami, Shigenari Hayashi, Norihito Sakaguchi, Seiji Miura
PRICM 7, PTS 1-3, 654-656, Pt.1, 436, 439, TRANS TECH PUBLICATIONS LTD, 2010年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, Nb, Al and Y(2)O(3) powders were mechanically alloyed together with 5 wt% stearic acid. The heavy plastic deformation of the powders by mechanical alloying led significant hardening to 970 Hv and the reduced grain size to 10 nm. Nb-Al base ODS alloys consolidated by HIP at 1500 degrees C and 150 MPa for 0.5 h gave the dual phase of Nb solid solution and Nb(3)Al compound. The oxide particles are of the hexagonal type YAlO(3) (YAH), with the size of 50 nm to 200 nm. The high-temperature ductility at 1200 degrees C and capability of the grain growth at 2000 degrees C were confirmed.

Alloy Design of Nb-Si Based High Temperature Alloys by Phase Stability Control
Seiji Miura, Tatsuichi Tanahashi, Yoshinao Mishima, Tetsuo Mohri
PRICM 7, PTS 1-3, 654-656, Pt.1, 444, +, TRANS TECH PUBLICATIONS LTD, 2010年
英語, 研究論文（国際会議プロシーディングス）, In order to spheroidize alpha-Nb5Si3 strengthening phase embedded in Nb matrix for attaining a good room temperature toughness of Nb-Si alloy, the authors have proposed a microstructure control technique by combining eutectic and eutectoid reactions. Nb3Si intermetallic compound formed during solidification is a key phase for the microstructure control, but its stability is very sensitive to the alloying elements. Nb3Si disappears by adding as small as 3 at% of W and Mo, while these elements are very effective for the solid solution strengthening of Nb phase. For a further alloy development, establishment of an alloy design concept based on the control of phase stability of Nb3Si is needed. Similarly to ferrous alloys such as stainless steels where Cr and Ni are added to control the stability of bcc phase and fcc phase, two alloying elements (one is a stabilizing element and the other is a destabilizing element for Nb3Si phase) are added to a Nb-Si binary master alloy and their microstructure is investigated using SEM. The stabilizing element Ta is found to enlarge the composition area where Nb3Si exists even with the destabilizing element Mo, and it is confirmed that the phase stability concept is useful for designing Nb-Si based alloys.

Twinning Behavior in AZ31-B Polycrystal Texture Subjected to In-Situ Bending Test
Itsuya Sato, Seiji Miura, Tetsuo Mohri
PRICM 7, PTS 1-3, 654-656, Pt.1, 715, 718, TRANS TECH PUBLICATIONS LTD, 2010年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, A commercial Mg alloy, AZ31B, has been used widely. In the texture of AZ31B sheet, each grain has its c-axis almost parallel to the sheet normal. Therefore, at the bending process of the sheet, basal slip system can not accommodate an in-plane plastic strain which is perpendicular to the c-axis of each grain. It is known that {10 (1) over bar2} twin can be formed by applying an extension strain parallel to the c-axis, which is equivalent to the a-axis compression strain. So in the bending deformation of the AZ31B sheet with a texture microstructure, it is expected that {10 (1) over bar2} twinning occurs. In this study, an in-situ bending test of AZ31B sheet with a texture was conducted under a confocal scanning laser microscope to observe twinning by applying compression stress along a direction almost perpendicular to the c-axis of grains. In addition, EBSD techniques were used for the analysis of crystal orientations. The process of twin development observed by the in-situ bending test can be summarized as follows; with the increase of the deformation strain, the total area of twins increases. However, it is noted that the growth of twins is apparent while the number of twins is almost constant during plastic bending deformmation. EBSD analysis suggested that twinning behavior obey Schmid's law even in the polycrystal.

Microstructure Simulation for Solidification of Magnesium-Zinc-Yttrium Alloy by Multi-phase-field Method Coupled with CALPHAD Database
Satoshi Minamoto, Sukeharu Nomoto, Atsushi Hamaya, Toshiaki Horiuchi, Seiji Miura
ISIJ INTERNATIONAL, 50, 12, 1914, 1919, IRON STEEL INST JAPAN KEIDANREN KAIKAN, 2010年, ［査読有り］
英語, 研究論文（学術雑誌）, The Mg-Zn-Y alloys show a good mechanical strength which can be achieved with the precipitation hardening by intermediate phases (X Wand / phase) in Mg solid solution (a phase) However an accurate control of the microstructure formation is required in order to obtain good mechanical properties In this study experimental observations of microstructures of the Mg-Zn-Y system have been performed Then we have focused on developing CALPHAD (CALculation of PHAse Diagrams) thermodynamic database to obtain the Gibbs free energy to draw phase diagram of the system and to understand the precipitation behavior of the intermediate phases In order to understand the formation of microstructures we have performed simulations of solidification of the alloy with use of multi-phase-field method At the beginning the solidification process has been calculated for a large area then the zoomed in region of the lamellar structures of the a phase and the W phase have been analyzed Resulting optimum lamellar spacing reproduce experimental one well

Influence of Substrate Dislocation on Passivation of Pure Iron in pH 8.4 Borate Buffer Solution
Takatoshi Yamamoto, Koji Fushimi, Seiji Miura, Hidetaka Konno
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 157, 7, C231, C237, ELECTROCHEMICAL SOC INC, 2010年, ［査読有り］
英語, 研究論文（学術雑誌）, The influence of substrate dislocations on the passivation behavior of pure iron in a pH 8.4 borate buffer solution was investigated. Cold-rolling was employed to induce dislocation in the annealed substrate. The dislocation density on the cold-rolled substrate depended on the reduction ratio (Red) and was maximum at Red = 60%. The electric charge consumed in the passivation and the passivity-maintaining current increased with an increase in the dislocation density. Electrochemical impedance spectroscopy revealed that the dislocation exposed to the iron surface increased the donor density in the passive film and reduced the charge-transfer resistance for the film aging. It was also demonstrated by radio frequency-glow discharge optical emission spectroscopy that a thick passive film formed on the cold-rolled iron compared with that on annealed iron. These results suggest that substrate dislocations enhance the reactions at the substrate/film interface, resulting in the formation of a highly defective passive film. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3425607] All rights reserved.

A Kinetic Monte Carlo Simulation of Ordering Process in Ti-Al System
Kazufumi Sato, Satoshi Takizawa, Seiji Miura, Tetsuo Mohri
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 78, 11, 114003.1-114003.6, PHYSICAL SOC JAPAN, 2009年11月, ［査読有り］
英語, 研究論文（学術雑誌）, We perform kinetic Monte Carlo simulations of atomic diffusion in the Ti-Al system using activation energies calculated by embedded atom method (EAM). The activation energies strongly depend on the atomic species occupying the four atomic sites which locate nearest to the saddle point in the fee lattice. It is found, however, that the configuration of atoms on the other sites surrounding the jumping atom plays an essential role in the atomic ordering process: we fail to reproduce the formation of ordered nuclei in using the activation energies which depend only on the configuration of the nearest four atoms, and the system remains in disordered states even at very low temperatures. By introducing a correction term to the activation energies which takes into account the contribution of nearest neighbor atoms of the migrating atom, we can simulate growth of ordered embrios.

Effect of microstructure on the high-temperature deformation behavior of Nb-Si alloys
Seiji Miura, Yuki Murasato, Yoshihito Sekito, Yukiyoshi Tsutsumi, Kenji Ohkubo, Yoshisato Kimura, Yoshinao Mishima, Tetsuo Mohri
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 510-11, 317, 321, ELSEVIER SCIENCE SA, 2009年06月, ［査読有り］
英語, 研究論文（学術雑誌）, Deformation behavior of Nb-Si-Zr alloys is investigated at various temperatures ranging from R.T. to 1670 K. The master alloy ingots composed of Nb-18.1 at% Si-1.5 at% Zr doped with Mg are Ar-arc-melted. The ingots contain Nb rods (radius: 1 mu m) in Nb(3)Si matrix formed by eutectic reaction. Alloys are subjected to heat treatments at 1923 K for 4-100 h to obtain a large Nb network structure with small silicide (alpha-Nb(5)Si(3)) particles by decomposing Nb(3)Si matrix into Nb and Nb(5)Si(3) through a eutectoid reaction. Compression tests are conducted at room temperature in air and at elevated temperatures in Ar atmosphere. At 1471 K the maximum strength is 500 MPa and compressive ductility is higher than 10% with a strain rate of 1.0 x 10(-4) s(-1), while at room temperature the maximum strength is over 1500 MPa and compressive ductility is about 1.5%. The high-temperature deformation obeys a power-law type equation. The stress exponent n is evaluated to be 4.8 and the apparent activation energy is 350kJ/mol. The Vickers indentation at room temperature revealed that the crack propagation at room temperature is suppressed effectively by ductile Nb. This suggests that the Nb aggregate in the network structure acts as a large Nb grain containing fine Nb(5)Si(3) particles, which might be beneficial for ductility at low temperatures. (C) 2009 Published by Elsevier B.V.

Nickel-Aluminides Long-Fiber Reinforced Nickel Matrix Composite fabricated by a Reaction at Narrow Holes Method　　　　　　　　　　　　　　　
Proceedings of 17th International Conference on Composite Materials (ICCM-17, Edinburgh), 1, 10, 2009年

Deformation Behavior of Niobium Silicides During High Temperature Compression
N. Sekido, S. Miura, Y. Yamabe-Mitarai, Y. Kimura, Y. Mishima
ADVANCED INTERMETALLIC-BASED ALLOYS FOR EXTREME ENVIRONMENT AND ENERGY APPLICATIONS, 1128, 413, +, MATERIALS RESEARCH SOC, 2009年
英語, 研究論文（国際会議プロシーディングス）, Deformation behavior of (Nb)/alpha-Nb5Si3 two-phase alloys is examined by high temperature compression tests. The alloys exhibit brittle fracture behavior at temperatures up to 1473 K, while reasonable compressive deformability at 1673 K. Upon high temperature compression of the alloys, the flow stress gradually decreases after the peak stress due to the recrystallization/recovery in the (Nb) phase, as well as the increase in the density of mobile dislocations within the alpha-Nb5Si3 phase. Two types of slip systems that operate in alpha-Nb5Si3 have been identified as (011)<1<(1)over bar>1] and {001)<100] in the present study.

Modeling of Microstructure Evolution in Nb-Si Eutectic Alloy Using Cellular Automaton Method
Kenichi Ohsasa, Seiji Miura
ADVANCED INTERMETALLIC-BASED ALLOYS FOR EXTREME ENVIRONMENT AND ENERGY APPLICATIONS, 1128, 407, 412, MATERIALS RESEARCH SOCIETY, 2009年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, A numerical model was developed for the simulation of microstructure evolution during the solidification of Nb-Si eutectic alloy. In this model, the cellular automaton method was used to simulate the eutectic growth of Nb solid solution and Nb(3)Si intermetallics. Diffusion in liquid, mass conservation at the solid/liquid interface and local equilibrium at the solid/liquid interface with consideration of curvature undercooling were solved to determine the positions of the Nb/liquid and Nb(3)Si/liquid interfaces. In the alloy with eutectic composition of 17.5 at%Si, irregular eutectic growth morphology was observed in relatively low undercooling region. On the other hand, in high undercooling region over 50 K, dendrite morphology of Nb(3)Si was observed. In the simulation for the alloy with hypo-eutectic composition of 16.0 at%Si, Nb solid solution grew with cell morphology in low undercooling region, while coupled eutectic morphology was formed in higher undercooling region over 8 K. The growth velocity of the coupled growth increased with increase in the degree of undercooling. In the alloy with hypo-eutectic composition of 12.0 at%Si, cell and dendrite morphology of Nb was formed in whole undercooling region,

Effect of growth rate on microstructure and microstructure evolution of directionally solidified Nb-Si alloys
Yoshihito Sekito, Seiji Miura, Kenji Ohkubo, Tetsuo Mohri, Norihito Sakaguchi, Seiichi Watanabe, Yoshisato Kimura, Yoshinao Mishima
ADVANCED INTERMETALLIC-BASED ALLOYS FOR EXTREME ENVIRONMENT AND ENERGY APPLICATIONS, 1128, 281, +, MATERIALS RESEARCH SOC, 2009年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, In the present work Nb-18.1 Si-1.5Zr alloy rods are produced with a growth rate ranging from 1.5 to about 1500 mm/h using the optical floating zone (OFZ) furnace. A part of each specimen is heat-treated at 1650 degrees C for 100 h. The microstructure was observed using SEM and TEM and analyzed using EPMA and EBSD.Eutectic-cells are observed in as-grown specimens with a growth rate of 150 mm/h or higher. It is found by EBSD analysis that the solidification direction of Nb is along < 113 > and that of Nb3Si is along <001], and {112) of Nb and {110) of Nb3Si are parallel. The present crystallographic orientation relationship between Nb and Nb3Si is different from that found in previous reports by several researchers. It was also confirmed that the heat-treated microstructure in the specimen grown by OFZ with a growth rate of 150 mm/h is similar to that in the heat-treated specimen prepared by arc-melting.

Microstructure Control of E21 Fe3AlC-bcc Ferrite Dual Phase Alloy and Its Mechanical Properties　　　　　　　　　　　　　　　
Hiroaki Ishii, Megumi Kitamoto, Seiji Miura, Kenji Ohkubo, Tetsuo Mohri
The Japan Society for Heat Treatment, 49, special issue 2, 514, 517, 2009年, ［査読有り］, ［責任著者］
研究論文（国際会議プロシーディングス）

Development of Sic particle-dispersed Mg-based functionally graded materials by a centrifugal solid-particle method
Yoshimi Watanabe, Hisashi Sato, Katsuya Mori, Su Min Lee, Ick Soo Kim, Hiromi Miura, Seiji Miura
The US-Japan Conference on Composite Materials 2008, (HTC-5)1-8, 2008年12月01日
Mg/SiC FGM is fabricated by the centrifugal method under different conditions. For this purpose, green compact of pure Mg chips and SiC particles was used as a master material. The microstructures and Vickers hardness of the successfully fabricated FGM were gradually changed depending on the region of the FGM samples. This tendency was more emphasized with increasing G number. This was caused by the distribution gradient of SiC and Mg2Si particles. Copyright ? 2008 by JSCM.

Liquid-Solid Equilibrium and Intermediate Phase Formation during Solidification in Mg-1.3 at%Zn-1.7 at%Y Alloy
Toshiaki Horiuchi, Akemi Ono, Kentaro Yoshioka, Takero Watanabe, Kenji Ohkubo, Seiji Miura, Tetsuo Mohri, Shigeyuki Tamura
MATERIALS TRANSACTIONS, 49, 10, 2247, 2253, JAPAN INST METALS, 2008年10月, ［査読有り］
英語, 研究論文（学術雑誌）, Mg-Y-Zn alloys have attracted much attention in recent years due to their excellent mechanical properties, which are said to be the effect of the intermediate phase (X phase) in the Mg solid solution (alpha phase). The formation behavior of the X phase has been reported to be a eutectic type reaction in the Mg-Y-Zn pseudo-binary system. However, the phase diagram of this system still requires clarification. In the present Study, the 97.0Mg-1.3Zn-1.7Y (at%) alloy was prepared to clarify the liquidus and solidus in the liquid-solid coexistence region, and the solubility limit in the alpha phase. The chemical compositions of the alloy were analyzed by electron probe X-ray microanalysis after isothermal heat treatment. The results indicate that the Mg-Y-Zn ternary system can be represented as a pseudo-binary system between the alpha and X phases. In addition, the solidus line for the alpha phase has been clarified. The solubility limit for the alpha phase is not much different from that of the previous report, whereas the formation behavior of the X phase is not in the manner of a eutectic reaction, but rather that of a peritectic one. [doi: 10.2320/matertrans.MAW200822]

Analysis of strain transfer through the Mg/Ti interface using crystallographic orientation analysis based on electron back-scattered diffraction patterns
Hiroaki Kawamoto, Seiji Miura, Kaori Yano, Kenji Ohkubo, Tetsuo Mohri
MATERIALS TRANSACTIONS, 49, 5, 1107, 1111, JAPAN INST METALS, 2008年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Improvement of deformability for Mg-based composite materials with a dispersion of Ti particles has been considered in terms of the Strain transfer through the interface, but is not fully understood during the deformation of ductile Ti particles. Mg-based composites composed of pure Mg and pure Ti plates was investigated to clarify the strain transfer through the Mg/Ti interface using crystallographic orientation analysis based on electron back-scattered diffraction (EBSD) patterns. It is suggested that the larger Schmid factor and lower residual strain energy (W) are significant for the operation of a prismatic slip system in the Ti grains.

Effect of rare-earth elements Y and Dy on the deformation behavior of Mg alloy single crystals
Seiji Miura, Shigeki Imagawa, Takeshi Toyoda, Kenji Ohkubo, Tetsuo Mohri
MATERIALS TRANSACTIONS, 49, 5, 952, 956, JAPAN INST METALS, 2008年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Effect of rare-earth elements (Y and Dy) on the mechanical properties of Mg solid solution single crystal is investigated. Comparing with the effect of other elements reported by previous studies, the solid solution strengthening by Y and Dy are much higher than that of other additives such as Zn for basal slip operation, while the isotropic strain by Zn atoms is higher than those of Y and Dy. Strain-rate changing tests were conducted for a further understanding of the dislocation motion and it revealed that the activation volumes estimated for Mg alloys with Y and Dy are much smaller than that of Zn-added alloy, while the activation enthalpy is almost the same. It was confirmed that the high strengthening effect by Dy addition is also found by Y addition, while the elastic interaction based on neither isotropic or anisotropic distortion are sufficient to explain the origin of the strengthening effect by Y and Dy addition.

The effect of metal texture on depassivation-repassivation behavior of iron in borate buffer solution investigated by micro-indentation
T. Yamamoto, K. Fushimi, H. Habazaki, H. Konno, S. Miura
ECS Transactions, 16, 52, 133, 140, 2008年
英語, 研究論文（国際会議プロシーディングス）, The effects of grain orientation and cold-rolling on the depassivation-repassivation behavior of polycrystalline irons were examined in pH8.4 borate buffer solution using in-situ micro-indentation technique. The depassivation rate on the passive iron surface during the downward drive of the indenter (penetration of an indenter tip into iron surface) depended on the grain orientation
the highest rate was obtained on {100} surface, on which a possible main slip plane of {110} was normal to the surface. In contrast, the total electric charge required for repassivation during the downward and subsequent upward drives was not influenced by the grain orientation. The electric charge for repassivation was strongly influenced by the rolling reduction that changed the dislocation density at the specimen surface. There was a linear correlation between the electric charge normalized by residual dent area and the square root of the dislocation density. ©The Electrochemical Society.

Effect of Hardness on Depassivation-repassivation Behavior of Pure Iron in Borate Buffer Solution　　　　　　　　　　　　　　　
Proceedings of 214th ECS Meeting, PRiME 2008, 1, 2008年

DEFORMATION BEHAVIOR OF Nb-Si BASED ALLOY HAVING LARGE Nb GRAINS WITH Nb5Si3 DISPERSOIDS　　　　　　　　　　　　　　　
Plasticity 2008 proceeding(CD-ROM), 1107, 2008年

新規化合物探索のための電子論計算に基づくAB二元系化合物の安定性評価と四元系金属間化合物への拡張
三浦 誠司, 滝沢 聡, 大久保 賢二, 毛利 哲雄
日本金属学会誌 = Journal of the Japan Institute of Metals, 71, 10, 860, 868, 日本金属学会, 2007年10月, ［査読有り］
日本語, 研究論文（学術雑誌）, In order to search stable intermetallic compounds in a broad composition area in ternary, quaternary and higher-order systems, it is effective to utilize the calculation of formation enthalpy for screening prior to the experimental study. As the number of candidates is tremendously large for ternary and quaternary alloys, an augmented-spherical-wave (ASW) method was employed for fast calculation. To evaluate the accuracy of the calculation, the formation enthalpy of 132, L1(0) and B19 structures of 99 equi-atomic compounds are estimated, and the most stable structure for each alloy is compared with the literature. It is found that 75% of the reported structures are predicted by the calculation results, and B19 structure tends to be evaluated less stable than L1(0) structure. The formation enthalpy of Heusler-like structure with Co-Fe-Ti-Zr equi-atomic quaternary composition is also estimated and this quaternary compound is unstable comparing with the estimated formation enthalpy of binary B2-CoFe, CoZr, FeTi and FeZr. An experimental study revealed there is a phase near the composition of the quaternary compound, but the structure is Laves-C14 Fe2Zr, neither the Hensler type nor bcc-based structure. It is concluded that the combination of ASW calculation and the experimental study is suitable for a broad search of compounds with relatively symmetric structure.

Mechanical properties of Co-based L1(2) intermetallic compound Co-3(Al,W)
Seiji Miura, Kenji Ohkubo, Tetsuo Mohri
MATERIALS TRANSACTIONS, 48, 9, 2403, 2408, JAPAN INST METALS, 2007年09月, ［査読有り］
英語, 研究論文（学術雑誌）, Mechanical properties of Ll(2)-Co-3(Al,W) polycrystalline sample are investigated by compression testing at various temperature ranging from room temperature to 1193 K. It was found that at room temperature the 0.2% flow stress is 410MPa and the compressive ductility is higher than 10%, whereas at 1193 K the 0.2% flow stress is 382 MPa and the compressive ductility is about 10%. Two candidates for the reaction scheme of the Co-rich region of the Co-Al-W ternary phase diagram are proposed by combining the results of microstructure observation, X-ray diffractometry and the previous report.

A NOVEL METHOD FOR THE MEASUREMENT OF THERMAL EXPANSION OF THIN FILM USING LASER SCANNING CONFOCAL MICROSCOPY
MIURA Seiji, OKA Kazuhiko, OHKUBO Kenji, MOHRI Tetsuo
実験力学 : journal of JSEM, 7, 0, 78, 82, 日本実験力学会, 2007年06月, ［査読有り］
英語

Micro structural control of Nb-Si alloy for large Nb grain formation through eutectic and eutectoid reactions
Seiji Miura, Kenji Ohkubo, Tetsuo Mohri
INTERMETALLICS, 15, 5-6, 783, 790, ELSEVIER SCI LTD, 2007年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Alloys based on Nb-silicides exhibit superior high temperature strength than the commercial nickel based superalloys. In order to improve the low-temperature ductility by microstructural control, authors have attempted to understand the nature of the eutectic and eutectoid reactions in Nb-rich portion of the Nb-Si binary system, especially the crystallographic orientation relationship among the phases using FESEM-EBSD. During the eutectic reaction it was found that Nb rods of about 1 mu m in diameter having a certain crystallographic orientation disperse in Nb3Si matrix in a eutectic cell. Then, during the following heat treatment Nb3Si decomposes into a lamellar structure composed of Nb and alpha-Nb5Si3 in a manner of eutectoid reaction. It is observed that eutectoid Nb plates tend to nucleate at the eutectic Nb rod because both of them have a similar crystallographic orientation, resulting in a network of Nb phase with fine alpha-Nb5Si3 dispersoids. The Nb network may act as a large Nb grain which is expected to show better mechanical properties at both low and high temperatures. Both the reaction kinetics of the eutectoid decomposition of Nb3Si and the tendency of the Nb network formation are significantly affected by doping elements, which are attributed to the control of the interfacial energies among phases. (c) 2006 Elsevier Ltd. All rights reserved.

Mechanical and physical properties of Ni3Al-Based alloys with Cr carbides dispersion
S. Miura, H. Goldenstein, K. Ohkubo, H. Sato, Y. Watanabe, T. Mohri
PRICM 6: SIXTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-3, 561-565, 439, +, TRANS TECH PUBLICATIONS LTD, 2007年
英語, 研究論文（国際会議プロシーディングス）, Ni3Al-based alloys possess good oxidation resistance, moderate room and high temperature strength and ductility. Introduction of Cr-carbide particles through a solidification route is attempted to provide higher hardness and wear resistance. The mechanical and physical properties are measured at room temperature for several alloys with various carbon concentrations up to 2.0 wt.%. Hardness and wear resistance as well as compressive strength increase with increasing carbon concentration, while bend ductility decreases. Adhesion between carbides and matrix phase is good, and cracks propagate mainly through carbides. The crystallographic orientation relationships between constituent phases are also attempted using electron back-scattering diffraction (EBSD) technique. The thermal conductivity is found to be less sensitive to the alloy composition.

Microstructural control of Nb-Si alloy with invariant reactions
S. Miura, J. H. Kim, K. Ohkubo, Y. Kimura, N. Sekido, Y. Mishima, T. Mohri
THERMEC 2006, PTS 1-5, 539-543, 1507, +, TRANS TECH PUBLICATIONS LTD, 2007年
英語, 研究論文（国際会議プロシーディングス）, Various investigations have been attempted to improve the low temperature ductility of Nb-silicides by microstructural control while they show superior high temperature strength. Present authors have focused on the microstructure evolution through the eutectic and eutectoid reactions in Nb-rich portion of Nb-Si binary system, and with small amounts of additives (Zr or Mg) alloys large Nb grains with fine silicide (alpha-Nb5Si3) particles have been obtained, which is attractive for high temperature use. For further understanding of this phenomenon, the present study has two objectives; one is to apply the advanced solidification technique for further microstructure control, and the other is to investigate the effect of co-existence of Zr and trace amount of Mg on the microstructure evolution during the eutectoid reaction in terms of the interfacial energy between phases. EBSD analysis revealed that uni-directionally solidified alloy show the same crystallographic orientation relationship (O.R.) between Nb and alpha-Nb5Si3 with that in arc-melted alloy having the same composition. On the other hand, Mg-doped alloy containing Zr shows an O.R. which was not observed in previous works. This implies that Mg doping is effective to control the interfacial energy between Nb and alpha-Nb5Si3 even in Nb-Si-Zr alloys. Two-step heat-treatment is found to be effective to obtain finer microstructure, and a further investigation on the controlling factors of eutectoid decomposition will provide a proper route to well-controlled micro structures.

High-Temperature Shape Memory Effect of Ti-(Pt, Ir)　　　　　　　　　　　　　　　
Materials Science Forum, 539-543, 3273, 3278, 2007年

Mechanical properties of L1₂-Co₃(Al, W) polycrystals at various temperatures　　　　　　　　　　　　　　　
S Miura, K Ohkubo, T Mohri
Materials Transactions, 48, 2403, 2408, 2007年, ［査読有り］

Deformation behavior of ReCr sigma phase diffusion barrier on Ni-based superalloy
Seiji Miura, Kenji Ohkubo, Tetsuo Mohri, Takayuki Yoshioka, Toshio Narita
ADVANCED INTERMETALLIC-BASED ALLOYS, 980, 487, +, MATERIALS RESEARCH SOC, 2007年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, In order to attain a better oxidation resistance of Ni-based superalloys for high performance engines, a ReCr-based sigma-phase diffusion barrier coating between the MCrAlY bond coat (Al reservoir) layer and a Ni-based superalloy substrate has been proposed to suppress the diffusion of Al and other elements. The deformation behavior of TMS82+ superalloy specimens with coating layers composed of an Al-rich surface layer (corresponding to a bond coat) and a ReCr sigma-phase inner layer is investigated. In-situ observation of the bending tests using a Laser scanning confocal microscopy revealed that the crack formation in the Al-rich surface layer(s) on the tension side of the bend specimen occurs at an early stage of bending. On the other hand, small cracks in the a-phase layer under the Al-rich surface layer(s) are formed at the slip traces in the Ni-based superalloy single crystal substrate. This suggests a good adhesion between the a phase and the Ni-based superalloy. At the compression side, in both the Al-rich surface layer(s) and the sigma-phase layer no cracking was observed until the Al-rich surface layer(s) shows buckling,

Microstructure control of Nb-Si alloy doped with Zr and Mg through eutectic and eutectoid reactions and its deformation behavior
Seiji Miura, Yuki Murasato, Kenji Ohkubo, Yoshisato Kimura, Nobuaki Sekido, Yoshinao Mishima, Tetsuo Mohri
ADVANCED INTERMETALLIC-BASED ALLOYS, 980, 327, +, MATERIALS RESEARCH SOC, 2007年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, In order to overcome the brittleness of Nb-Si intermetallic compounds, novel inicrostructure control through eutectic solidification and eutectoid decomposition reactions has been proposed for obtaining Nb matrix alloys with a Nb-silicide dispersion by the present authors. As the additions of Zr and Mg accelerate the eutectoid decomposition rate and spheroidization of Nb-silicide during heat treatment, the effects of these additives on the eutectic microstructure are investigated. The effect of the growth rate during the uni-directional solidification on the microstructure of a selected alloy was examined and it was found that the following eutectoid reaction rate is strongly affected by the growth rate.

Microstructure development of unidirectionally solidified (Nb)/Nb3Si eutectic alloys
Nobuaki Sekido, Yoshisato Kimura, Seiji Miura, Yoshinao Mishima
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 444, 1-2, 51, 57, ELSEVIER SCIENCE SA, 2007年01月, ［査読有り］
英語, 研究論文（学術雑誌）, Unidirectional solidification experiments were performed on the (Nb)/Nb3Si eutectic alloys in the Nb-Si binary and Nb-Ti-Si ternary systems. The effect of solidification rates on microstructure development was studied using an optical floating zone melting furnace within the solidification rates from 10 to 200 mm/h. For the binary invariant eutectic alloy, a planar eutectic microstructure forms at 10 mm/h, while cellular eutectic microstructures develop at the higher solidification rates. The orientation relationship between Nb and Nb3Si formed upon planar eutectic solidification is determined as: {110}(Nb)//{110)(Nb3Si), and < 112 >(Nb)//< 001](Nb3Si). For the ternary univariant eutectic alloys, the formation of cellular eutectic microstructures is prevailing for all over the rates of solidification. The growth of Nb3Si is faster than that of (Nb). The size distribution of (Nb) particles spreads widely in an asymmetric manner. The cell size variation against solidification rates is in a reasonable agreement with the theoretical prediction. (c) 2006 Elsevier B.V. All rights reserved.

An Analysis of the Anomalous Temperature Dependence of Strength in Single Crystalline L12, Cu3Pt Alloys
MITSUI Kazuhiro, MIURA Seiji
学際研究, 62, 2006, 2013, 2006年11月30日
英語

Fracture toughness and high temperature strength of unidirectionally solidified Nb-Si binary and Nb-Ti-Si ternary alloys
Nobuaki Sekido, Yoshisato Kimura, Seiji Miura, Fu-Gao Wei, Yoshinao Mishima
JOURNAL OF ALLOYS AND COMPOUNDS, 425, 1-2, 223, 229, ELSEVIER SCIENCE SA, 2006年11月, ［査読有り］
英語, 研究論文（学術雑誌）, The (Nb)/NTb3Si eutectic alloys in the Nb-Si binary and Nb-Ti-Si ternary systems were unidirectionally solidified in an optical floating zone melting furnace. The effect of solidification rates on microstructures of the alloys is investigated. The coupled growth of (Nb) and Nb3Si is observed in the binary alloy solidified at 10 mm/h. The ternary alloys exhibit the development of discontinuous (Nb) particles within the Nb3Si matrix. The unidirectionally solidified alloys show improved fracture toughness and enhanced high temperature compressive strength as compared with the arc-melted counterparts. The role of an aligned eutectic microstructure in toughening is discussed from the existing models based on the crack bridging and the crack deflection. (c) 2006 Elsevier B.V. All rights reserved.

Thermophysical Properties of Rh3X for Ultra-High Temperature Applications THERMAL CONDUCTIVITY AND THERMAL EXPANSION OF L1(2) INTERMETALLIC COMPOUNDS OF RHODIUM WITH TITANIUM, ZIRCONIUM, HAFNIUM, VANADIUM, NIOBIUM AND TANTALUM
Yoshihiro Terada, Kenji Ohkubo, Seiji Miura, Tetsuo Mohri
PLATINUM METALS REVIEW, 50, 2, 69, 76, JOHNSON MATTHEY PUBL LTD CO, 2006年04月, ［査読有り］
英語, 研究論文（学術雑誌）, Thermal conductivity and thermal expansion were measured for the L1(2) intermetallic compounds Rh3X ( X = Ti, Zr, Hf, V, Nb, Ta) in the temperature range 300-1100 K to evaluate the feasibility of applying the compounds as ultra-high temperature structural materials. The thermal conductivities of Rh3X are widely distributed over the range 32-103 W m(-1) K-1 at 300 K, but the differences between the thermal conductivities diminish at higher temperatures. A trend is observed in that the thermal conductivity of Rh3X is greater if the constituent X belongs to Group 5 rather than to Group 4 in the Periodic Table. The coefficient of thermal expansion (CTE) values of Rh3X increase slightly with increasing temperature; values are concentrated around 10 x 10(-6) K-1 at 800 K. CTE values of Rh3X decrease as X appears lower in the Periodic Table. It is demonstrated that Rh3Nb and Rh3Ta are suitable for ultra-high temperature structural applications due to their higher thermal conductivities and smaller CTE values.

Thermophysical properties of Rh 3X for ultra-high temperature applications
Yoshihiro Terada, Kenji Ohkubo, Seiji Miura, Tetsuo Mohri
Platinum Metals Review, 50, 2, 69, 76, 2006年04月, ［査読有り］
英語, 研究論文（学術雑誌）, Thermal conductivity and thermal expansion were measured for the L1 2 intermetallic compounds Rh 3X (X = Ti, Zr, Hf, V, Nb, Ta) in the temperature range 300-1100 K to evaluate the feasibility of applying the compounds as ultra-high temperature structural materials. The thermal conductivities of Rh 3X are widely distributed over the range 32-103 W m -1 K -1 at 300 K, but the differences between the thermal conductivities diminish at higher temperatures. A trend is observed in that the thermal conductivity of Rh 3X is greater if the constituent X belongs to Group 5 rather than to Group 4 in the Periodic Table. The coefficient of thermal expansion (CTE) values of Rh 3X increase slightly with increasing temperature
values are concentrated around 10 × 10 -6 K -1 at 800 K. CTE values of Rh 3X decrease as X appears lower in the Periodic Table. It is demonstrated that Rh 3Nb and Rh 3Ta are suitable for ultra-high temperature structural applications due to their higher thermal conductivities and smaller CTE values.

Mechanical properties of Ti-50(Pt,Ir) high-temperature shape memory alloys
Yoko Yamabe-Mitarai, Toru Hara, Seiji Miura, Hideki Hosoda
MATERIALS TRANSACTIONS, 47, 3, 650, 657, JAPAN INST METALS, 2006年03月, ［査読有り］
英語, 研究論文（学術雑誌）, To develop high-temperature shape memory alloys, Ti-50(Pt,Ir)mol% compounds are noted because of their martensitic transformation from B2 to B19(2H) or 4H(40) structures above 1273 K. A thermal expansion measurement and loading-unloading compression test were performed for Ti-50(Pt,Ir) to determine if the shape memory effect or superelasticity was shown. The thermal expansion measurement indicated the shape recovery in some of the compounds. The maximum shape recovery was about 4% by reheating at the above martensite transformation temperature after a loading-unloading compression test. Superelasticity was also observed in ternary compounds. The potential of Ti-50(Pt,Ir) as a high-temperature shape memory alloy is discussed.

Orientation relationship between Nb and Nb5Si3 (D8(1)) phases in the eutectoid lamellar microstructure
N Sekido, FG Wei, Y Kimura, S Miura, Y Mishima
PHILOSOPHICAL MAGAZINE LETTERS, 86, 2, 89, 98, TAYLOR & FRANCIS LTD, 2006年02月, ［査読有り］
英語, 研究論文（学術雑誌）, The crystallography of a Nb/Nb5Si3 lamellar microstructure formed by Nb3Si decomposition has been investigated by transmission election microscopy. Upon solidification of a Nb-10 at.% Ti-20 at.% Si alloy, the high-temperature phase Nb3Si is retained at room temperature. During annealing at 1673 K, the Nb3Si phase transforms into the Nb and Nb5Si3 (D8(1)) phases with a lamellar microstructure through a eutectoid reaction. The orientation relationship between Nb and Nb5Si3 is determined by selected-area diffraction analyses as (01(1) over bar) (Nb)//(12(3) over bar)(Nb5Si3), and [133](Nb)//[111](Nb5Si3). The present orientation relationship is explained by good atomic matching on the close-packed planes along the near close-packed directions.

Geometrical approach to reaction schemes of multicomponent phase diagrams
S Miura
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, 27, 1, 34, 46, ASM INTERNATIONAL, 2006年02月, ［査読有り］
英語, 研究論文（学術雑誌）, A unique method for describing and establishing the reaction scheme of a multicomponent phase diagram is proposed in terms of graph theory. A geometrical representation of the connections between invariant reactions is considered as the basis to introduce the matrix formula of a graph that models a reaction scheme; then the number of all possible reaction schemes is enumerated. With a matrix operation, the most probable (full or partial) reaction scheme(s) can be selected within available experimental data. A ternary phase diagram was chosen as an example to show how to relate with experimental data. It is also shown that the number of invariant reactions in a ternary phase diagram can be expressed as a function of the numbers of binary and ternary phases.

A Novel method for the Measurement of Thermal Expansion of Thin Film using Laser Scanning Confocal Microscopy　　　　　　　　　　　　　　　
Proceedings of International Symposium on Advanced Fluid/Solid Science and Technology in Experimental Mechanics, 367, 371, 2006年

Microstructure control of Nb-Si based multi component alloys using Eutectic and Eutectoid reactions　　　　　　　　　　　　　　　
6, 2, 111, 118, 2006年

Geometrical approach to a reaction scheme of multi-component phase diagram and its application to a part of Al-Mo-Ti ternary phase diagram　　　　　　　　　　　　　　　
6, 2, 49, 58, 2006年

210 Ti(Pt,Ir)の高温形状記憶特性(OS9(1) 形状記憶合金の特性と応用)
御手洗 容子, 原 徹, 三浦 誠司, 細田 秀樹
材料力学部門講演会講演論文集, 2006, 0, 77, 78, 一般社団法人 日本機械学会, 2006年
日本語, To develop high temperature shape memory alloys, TiPt and TiIr are noted because of their possibility of phase transformation above 1273K. Then, the effects of Iridium (Ir) into TiPt on the constituent phases and the phase transformation temperature were investigated. It was found that the B19 phase appeared up to 37.5at% Ir in Ti (Pt, Ir) and the phase transformation temperature raised from 1303K in TiPt to 1473K in the Ti-12.5Pt-37.5Ir. Shape recovery and superelasticity of Ti-50 (Pt, Ir) were investigated by thermal expansion measurement in dilatometer and loading-unloading compression test. The shape recovery was found in all compounds in at least one of the testing methods. The highest shape recovery, about 4% was found in Ti-25Pt-25Ir using loading-unloading compression test. On the other hand, superelasticity was found in only ternary compounds. Larger superelasticity was observed in ternary compounds with higher Ir contents. Potential of Ti-50 (Pt, Ir) as high-temperature shape memory alloys is discussed.

Effect of tetragonal distortion introduced by anti-site defect configuration on additional hardening in off-stoichiometric Al-rich Ni3Al alloys
S Miura, S Takizawa, T Suzuki, Y Mishima, T Mohri
ACTA MATERIALIA, 53, 19, 5175, 5181, PERGAMON-ELSEVIER SCIENCE LTD, 2005年11月, ［査読有り］
英語, 研究論文（学術雑誌）, A theoretical approach to the hardening mechanism of L1(2)-Ni3Al compound with Al-rich off-stoichiometric composition is attempted based on the classical elastic interaction model between an edge dislocation and a unit cell with an equi-atomic composition embedded in Ni3Al. A tetragonal distortion is expected to arise from a local anisotropic atomic configuration in the unit cell which is recognized as a face-centered tetragonal-L1(0) or distorted B2 NiAl structure around an anti-site Al atom. According to the study by Cochardt et al. (Acta Metall 1955;3:533), it is found that the maximum point force F, on an edge dislocation from the local L1(0) unit cell increases with decreasing the cilai ratio of the L1(0) structure toward the stable B2 structure, which is expected from the authors' recent electronic structure calculations on the stability of L1(0)-NiAl relative to B2-NiAl. This increment of F-m by decreasing the cilai ratio accounts for a larger hardening in Al-rich Ni3Al than that in Ni-rich Ni3Al at 77 K. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Structural stability of NiAl with the L1(0) structure and local lattice distortion in the Ni3Al alloy around excess Al atoms
S Takizawa, S Miura, T Mohri
INTERMETALLICS, 13, 11, 1137, 1140, ELSEVIER SCI LTD, 2005年11月, ［査読有り］
英語, 研究論文（学術雑誌）, For explaining asymmetry in the flow stress of Ni3Al alloy as a function of aluminum content, the structural energy of ordered NiAl alloy with the L1(0) structure is obtained with the electronic structure calculations based on the density functional theory. Quite a large distortion in the c-direction is found at the equilibrium, which means an L1(0)-like local structure appearing in the Al-rich region of the Ni3Al phase undergoes a large tetragonal strain. This tetragonal strain will give an explanation for the strengthening mechanism using the framework of Cochardt et al. The effect of the A1 concentration on the structural stability of L10 in terms of the DOS is also discussed to explain the concentration dependence of the B2-L1(0) martensitic transition temperature. (c) 2004 Elsevier Ltd. All rights reserved.

High temperature deformation and extended plasticity in Mg single crystals
H Miura, Yang, X, T Sakai, H Nogawa, S Miura, Y Watanabe, JJ Jonas
PHILOSOPHICAL MAGAZINE, 85, 30, 3553, 3565, TAYLOR & FRANCIS LTD, 2005年10月, ［査読有り］
英語, 研究論文（学術雑誌）, The high temperature deformation behavior of Mg single crystals was precisely investigated using orientation imaging microscopy. For this purpose, Mg single crystals of various orientations were tensile tested in vacuum at temperatures between 473 and 673 K. A strain rate of 4.2 x 10(-4) s(-1) was employed. The elongations to fracture depended strongly on crystal orientation, the lowest fracture strains being associated with multiple slip. Single crystals in which single slip was activated exhibited extended ductilities corresponding to more than 1.5 in true strain. The strong orientation dependence of the ductility can also be correlated with the ease of occurrence of dynamic recrystallization (DRX), which took place in the multiple-slip specimens. The role of twinning in the initiation of DRX is also discussed.

「高温場における変形・流動特性評価」レーザー顕微鏡と光干渉法を組み合わせたミクロンサイズ薄膜熱膨張測定の試み
三浦誠司, 岡和彦, 大久保賢二, 毛利哲雄
実験力学, 5, 3, 197, 202, 2005年09月, ［査読有り］
日本語

「高温場における変形・流動特性評価」レーザー顕微鏡を用いた環境下高温3点曲げ変形挙動の直接観察
三浦誠司, 大久保賢二, 毛利哲雄, 成田敏夫
実験力学, 5, 3, 203, 208, 2005年09月, ［査読有り］
日本語

Phenomenological calculation of the Fe-Pd-based L1(0)-ordered phase in the Fe-Pd-Ni ternary system
T Horiuchi, M Igarashi, F Abe, K Ohkubo, S Miura, T Mohri
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 36A, 8, 1999, 2006, MINERALS METALS MATERIALS SOC, 2005年08月, ［査読有り］
英語, 研究論文（学術雑誌）, A phenomenological calculation of phase equilibria by combining the cluster variation method (CVM) with the Lennard-Jones-type (L-J-type) pairwise atomic interaction energies has been attempted for the Fe-Pd-Ni ternary system in order to examine the possibility of Ni as the substituting element for Pd. The calculated Ni content in an Fe-Pd-based L1(0) ordered phase at 863 K shows fairly good agreement with the experimental analysis performed for Fe-5Pd-5Ni alloy by energy-dispersive X-ray spectroscopy of a transmission electron microscope. The detailed calculation indicates that Ni is preferentially substituted in a Pd site in the L1(0)-ordered phase, which can be interpreted by the Lennard-Jones-type pairwise potentials employed for the present study. It is concluded from the thermodynamic point of view that Ni is a promising candidate as the substituting element for Pd in an Fe-Pd-based L1(0) ordered phase.

「スマートマテリアル」 (Pt,Ir)‐50at%Tiにおける形状記憶効果の可能性
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会誌, 69, 8, 634, 642, 日本金属学会, 2005年08月, ［査読有り］
日本語, 研究論文（学術雑誌）, It is known that some of platinum group metals base intermetallics have shape memory effect. We note PtTi because its phase transformation temperatures is at around 1273 K. The phase transformation of PtTi and the effect of Ir on the phase transformation were investigated by X-ray diffractometry (XRD), differential thermal analysis (DTA), in-situ surface observation in laser microscope, and microstructure observation in transmission electron microscopy (TEM). The shape recovery was investigated by dilatometry. Microstructure suggests martensitic phase transformation occurs in PtTi and (Pt, Ir) Ti. The shape recovery was found in some of the tested alloys. Potential of platinum group metals base intermetallics as high temperature shape memory alloys is discussed in this paper.

Phase equilibria in the Ir-rich portion of the Ir-Al-X (X : Ti, Zr and Hf) ternary systems
S Miura, K Ohkubo, Y Terada, Y Kimura, Y Mishima, Y Yamabe-Mitarai, H Harada, T Mohri
JOURNAL OF ALLOYS AND COMPOUNDS, 393, 1-2, 239, 247, ELSEVIER SCIENCE SA, 2005年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Isotherms of the Ir-rich portion of the Ir-Al-X (X: Ti, Zr, Hf) systems are presented. In all of the isotherms three-phase equilibrium is found and no ternary compound is observed. Solid solubility of each phase is confirmed by chemical analysis by wavelength dispersive X-ray spectroscopy (WDS). The direction of the solubility lobe of L1(2)-Ir3X with Al addition is explained in terms of the nearest neighbor interactions. Liquidus surfaces are also established by taking into account the microstructure of as-cast alloys, differential thermal analysis (DTA) data, Ir-X binary phase diagrams reported previously and the phase equilibria of the Ir-Al binary system investigated in the present study. (c) 2004 Elsevier B.V. All rights reserved.

Functionally graded material fabricated by a centrifugal method from ZK60A magnesium alloy
Y Watanabe, R Sato, IS Kim, S Miura, H Miura
MATERIALS TRANSACTIONS, 46, 5, 944, 949, JAPAN INST METALS, 2005年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Magnesium based functionally graded material (FGM) was fabricated by a centrifugal method from ZK60A (Mg-5.5 mass%Zn-0.6 mass%Zr) alloy. The applied G numbers are 40, 80 and 120, where the G number is the centrifugal force in unit of gravity. The specimen shape was cylindrical with 18 mm in length. Microstructures of the fabricated FGM specimens were observed using SEM. Energy dispersive X-ray analysis was performed to study the. chemical compositional gradients within the fabricated FGM specimens. It was found that concentration of Zr in the specimens increases toward the centrifugal force direction, while no or quite small chemical compositional gradient of MgZn2 appears. A hardness change along the centrifugal force direction was also found. The graded structures are caused by the difference in the formation mechanisms of compositional gradient during the centrifugal method between Zr and Zn.

Phase equilibria in Ir-rich portion of Ir-AI-X (X : V, Nb and Ta) ternary systems
S Miura, K Ohkubo, Y Terada, Y Kimura, Y Mishima, Y Yamabe-Mitarai, H Harada, T Mohri
JOURNAL OF ALLOYS AND COMPOUNDS, 395, 1-2, 263, 271, ELSEVIER SCIENCE SA, 2005年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Isotherms of the Ir-rich portion of the Ir-Al-X (X: V, Nb, Ta) systems composed of fcc-Ir solid solution ((Ir)(ss)), Ir-based L1(2) intermetallic compounds Ir3X and B2-IrAl are presented as a second report of a series of investigations on the phase equilibria in the (Ir or Rh)-Al-X (X: Ti. Zr and HE or. V. Nb and Ta) ternary systems. In both Ir-Al-Nb and Ir-Al-Ta systems fcc/L1(2)/B2 three-phase equilibrium is found. In Ir-Al-V system, Ir solid solution and Ir3V have close compositions each other and fcc/L1(2)/B2 three-phase equilibrium is expected. No ternary compound is observed in all of the isotherms. Solid solubility of each phase is confirmed by chemical analysis by wavelength dispersive X-ray spectroscopy (WDS). The direction of the solubility lobe of L1(2)-Ir3X with Al addition is explained in terms of the nearest neighbor interactions. Liquidus surfaces are also established by taking into account the microstructure of as-cast alloys, differential thermal analysis (DTA) data, and the Ir-Al and the Ir-X binary phase diagrams reported previously. © 2004 Elsevier B.V. All rights reserved.

ZK60A合金を用いて作製したマグネシウム基傾斜機能材料
渡辺義見, 佐藤隆芳, KIM Isk‐Soo, 三浦誠司, 三浦博己
傾斜機能材料論文集, 2004, 1, 6, 2005年03月31日
日本語

Effects of Zr on the eutectoid decomposition behavior of Nb3Si into (Nb)/Nb5Si3
S Miura, M Aoki, Y Saeki, K Ohkubo, Y Mishima, T Mohri
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 36A, 3, 489, 496, MINERALS METALS MATERIALS SOC, 2005年03月, ［査読有り］
英語, 研究論文（学術雑誌）, The effect of Zr on the formation of Nb/Nb5Si3 lamellar microstructure by eutectoid decomposition reaction of Nb3Si is investigated. It has been shown that the kinetics of the eutectoid decomposition of high-temperature Nb3Si phase into Nb and Nb5Si3 phases are sluggish in the binary Nb-Si system and that they are enhanced by Zr additions. The time-temperature-transformation (TTT) diagram for the decomposition is experimentally determined and the acceleration of the reaction by small Zr addition of 1.5 at. pct is confirmed by comparison with the reported TTT curves of binary and ternary alloys containing Ti. The role of the ternary element on the decomposition kinetics is discussed in terms of crystallographic orientation relationships (ORs) and Zr distribution in the parent Nb3Si phase during solidification.

「高温レーザー顕微鏡を用いた金属材料高温変形直接観察の試み」　　　　　　　　　　　　　　　
エネルギー変換マテリアル研究センターシンポジウム、"2005 Symposium on Materials and Systems for Energy Conversion", CARECM, 232, 236, 2005年

Orientation dependence of ductility of Mg single crystals at elevated temperature　　　　　　　　　　　　　　　
Materials Science Forum, 193-196, 488, 489, 2005年

Investigation on the microstructure and high temperature mechanical properties of Al₃Ti-Mo₃Al two-phase alloys　　　　　　　　　　　　　　　
Materials Science Forum, 475-479, 837, 840, 2005年

Effect of Temperature and Ternary Additives on the Crystallographic Orientation Relationships among Phases related to the Eutectoid Decomposition of Nb₃Si　　　　　　　　　　　　　　　
MRS Symp. Proc. "Integrative and Interdisciplinary Aspects of Intermetallics", 842, 279, 285, 2005年

「ZK60A合金を用いて作製したマグネシウム基傾斜機能材料」　　　　　　　　　　　　　　　
2004年度傾斜機能材料論文集, 1, 6, 2005年

Mechanical properties of (Pt, Ir)Ti　　　　　　　　　　　　　　　
Materials Science Forum, 475-479, 1987, 1990, 2005年

In-situ observation of surface relief formation and disappearance during order-disorder transition of equi-atomic CuAu alloy using laser scanning confocal microscopy
S Miura, H Okuno, K Ohkubo, T Mohri
Integrative and Interdisciplinary Aspects of Intermetallics, 842, 455, 460, MATERIALS RESEARCH SOCIETY, 2005年
英語, 研究論文（国際会議プロシーディングス）, In-situ observation of the formation and disappearance of the surface relief associated with the twinning during the order-disorder transitions among CuAu-I (L1(0)), CuAu-II (PAP) and disordered fcc phases was conducted using Confocal Scanning Laser Microscopy equipped with a gold image furnace. The Retro effect was confirmed in poly-crystal samples, however no evidence was found in single-crystal samples. Also observed in poly-crystal samples are that the disordering temperature detected by the disappearing of relieves is different from grain to grain, and that grain boundary cracking alleviates the Retro effect. The observed phenomena were explained based on the crystallographic orientation relationship among grains investigated by FESEM/EBSD in terms of the elastic strain effect around grain boundaries induced by transition. It was confirmed that in each grain the surface relieves correspond to a set of two 10 111 planes having a < 100 > axis perpendicular to both planes in common. It was also found that the larger the average strain of two neighboring grains is, the lower the transition temperature. This observation was explained by the stress effect on the stability of a phase.

レーザー顕微鏡を用いた環境下高温3点曲げ変形挙動の直接観察 (特集 高温場における変形・流動特性評価)
三浦 誠司, 大久保 賢二, 毛利 哲雄
実験力学, 5, 3, 203, 208, 日本実験力学会, 2005年, ［査読有り］
日本語

レーザー顕微鏡と光干渉法を組み合わせたミクロンサイズ薄膜熱膨張測定の試み (特集 高温場における変形・流動特性評価)
三浦 誠司, 岡 和彦, 大久保 賢二
実験力学, 5, 3, 197, 202, 日本実験力学会, 2005年, ［査読有り］
日本語

Investigation on the microstructure and high temperature mechanical properties of Al3Ti-Mo3Al two-phase alloys
S Miura, H Shimamura, K Ohkubo, T Mohri
PRICM 5: THE FIFTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-5, 475-479, Pt.1, 837, 840, TRANS TECH PUBLICATIONS LTD, 2005年
英語, 研究論文（学術雑誌）, Investigation on the crystallographic orientation relationships among D0(22)-Al3Ti, A15-Mo3Al and high temperature bcc phase consisting of an Al-Mo-Ti ternary alloy with an equi-axed two-phase structure was conducted by FESEM/EBSD analysis. The grains of intermetallic phases have certain crystallographic orientations each other, while the crystallographic orientation distributions become random after a high temperature deformation. This strongly suggests the grain boundary sliding and grain rotating govern the high temperature deformation, which is consistent with the fact that the strain-rate sensitivity m is 0.3 or higher during a steady-state compressive deformation.

Orientation dependence of ductility of Mg single crystals at elevated temperature
H Miura, T Sakai, H Nogawa, Yang, X, Y Watanabe, S Miura
MAGNESIUM - SCIENCE, TECHNOLOGY AND APPLICATIONS, 488-489, 193, 196, TRANS TECH PUBLICATIONS LTD, 2005年, ［査読有り］
英語, 研究論文（学術雑誌）, Orientation-controlled Mg single crystals were tensile tested at temperatures between 473 K and 673 K at a strain rate of 4.2 x 10(-4) s(-1) in vacuum. Though all the single crystals showed high ductility compared with that of polycrystals, the ductility of the single crystals strongly depended on the crystal orientation. The [27 -1 -26 1] single crystal showed 0.57 fracture stra4 while the [3 8 -11 -1] single crystal showed superplastic behavior of ductility over 1.8 strain. The observed strong orientation dependence of ductility seemed to be caused by orientation dependence of ease occurrence of dynamic recrystallization (DRX) in the single crystals during high-temperature deformation. The orientation dependence of ductility of Mg single crystals will be discussed in detail concerning crystallographical orientations of the single crystals, occurrence of DRX and fracture.

Effect of microstructure and Zr addition on the crystallographic orientation relationships among phases related to the eutectoid decomposition of Nb3Si in near eutectic Nb-Si alloy
S Miura, K Ohkubo, T Mohri
Integrative and Interdisciplinary Aspects of Intermetallics, 842, 279, 284, MATERIALS RESEARCH SOCIETY, 2005年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, The authors have reported in the previous study that the sluggish decomposition of Nb3Si phase is effectively accelerated by Zr addition [1]. This is obvious at lower temperature range than the nose temperature of the TTT curve. In the present study a eutectic alloy containing 1.5 % of Zr was investigated. The crystallographic orientation relationships among phases, such as eutectic Nb and product phases formed by eutectoid decomposition of Nb3Si (eutectoid Nb and Nb5Si3 phases) in the Zr-containing sample which was heat treated at 1300 degrees C were investigated by FESEM/EBSD for. further understanding of the decomposition process in alloy with a different microstructure.

Solidification process and mechanical behavior of the Nb/Nb5Si3 two phase alloys in the Nb-Ti-Si system
N Sekido, Y Kimura, S Miura, Y Mishima
MATERIALS TRANSACTIONS, 45, 12, 3264, 3271, JAPAN INST METALS, 2004年12月, ［査読有り］
英語, 研究論文（学術雑誌）, Design of two-phase alloys consisting of niobium solid solution (A2) and alpha-Nb5Si3 (D8(1)) phases in the Nb-Ti-Si tertiary system is pursued for ultra-high temperature structural applications. Compositional and annealing conditions are determined for the formation of A2/D8(1) lamellar microstructure via cutectoid decomposition of Nb3Si (tP32) phase in the Nb-Si binary and Nb-Ti-Si tertiary system. Addition of titanium is found to result in increased room temperature toughness, but decreased high temperature strength. Enhancement of mechanical properties is achieved by applying the directional solidification technique. Mechanical properties of the alloys are discussed from microstructural point of view.

Preliminary results on development of a thin GSO scintillator for neutron science
JH Kaneko, N Susa, S Tsuchida, M Watanabe, S Miura, T Mizuno, Y Yamauchi, M Hashiba, T Oku, A Homma, F Fujita, T Ino, M Furusaka, T Sawamura, HM Shimizu, Y Kiyanagi
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 529, 1-3, 307, 309, ELSEVIER SCIENCE BV, 2004年08月, ［査読有り］
英語, 研究論文（学術雑誌）, A thin GSO scintillator was developed aiming at applications for the neutron science. In order to fabricate a large and thin GSO scintillator in the future, fabrication was started from two types of GSO powders. Although several GSO films were fabricated by evaporation techniques, these films did not have luminescence in photo luminescence (PL) spectroscopy. Thus, these samples were annealed up to 1550degreesC. However, it resulted in no luminescence observation. In response to these results, GSO powders were directly annealed; a phenomenon looking like melting and sintering were observed for Gd2Si2O7:Ce at a temperature higher than 1500degreesC. This sample was quasi-transparent and had luminescence at 405 nm in PL spectrum. In addition, this sample was tougher than a GSO single crystal. In conclusion, the prospect of fabrication of a thin GSO scintillator by combination of annealing and mechanical polishing was obtained. (C) 2004 Elsevier B.V. All rights reserved.

Effects of microstructure on high temperature mechanical properties of Al3Ti-MO3Al two-phase intermetallic alloys
S Miura, H Shimamura, J Fujinaka, T Mohri
INTERMETALLICS, 12, 7-9, 771, 777, ELSEVIER SCI LTD, 2004年07月, ［査読有り］
英語, 研究論文（学術雑誌）, The high temperature deformation behavior of two-phase intermetallic-based alloys composed of the DO22-Al3Ti and A15-Mo3Al phases is investigated. It is found that the equi-axed two-phase structure formed by an isothermal heat treatment is very stable even after a high-temperature heat treatment and, moreover, the microstructure is retained even after heavy deformation at high temperature. The strain-rate sensitivity m is 0.3 or higher, and a steady state deformation is attained. Compressive deformability is found to be extremely high with the equi-axed two-phase structure. Conversely, a lamellar structure was found to be unstable during deformation. The strain-rate sensitivity m of the specimens with a lamellar structure is almost the same as that of the equi-axed two-phase structure, and the resulting microstructure strongly suggests that the deformation is concentrated at the boundaries between the lamellar colonies, where the equi-axed two-phase structure is formed during deformation by spheroidization. (C) 2004 Elsevier Ltd. All rights reserved.

遠心力固相法によるチタン粒子分散マグネシウム基傾斜機能材料の開発
佐藤 隆芳, 渡辺 義見, 三浦 誠司, 三浦 博己
軽金属, 54, 11, 522, 526, 軽金属学会, 2004年, ［査読有り］
日本語, Three kinds of magnesium based titanium particles-dispersed functionally graded materials (FGMs) were fabricated by a centrifugal solid-particle method. Materials were pure magnesium, AZ91D ( 9.23Al-0.7Zn-0.028Si-0.23Mn-0.0019Fe 0.0014Cu 0.001Ni-0.0009Be-bal.Mg) and Mg-6mass%Zn alloys. The specimen shape was cylinder with 15 20mm in length. Microstructures of FGM specimens were observed using an optical microscopy (OM) or a scanning electron microscopy (SEM). 2 vol%Ti was added into Mg 6 mass%Zn by a vortex addition technique in order to fabricate Mg-6 mass%Zn-2 vol%Ti master alloy. It was found that a large number of titanium particles were observed in the outer region of the cylinder, since the titanium particles migrate to outer region during the centrifugal solid-particle method. In this way, the magnesium based titanium particles dispersed FGM can be successfully fabricated by the centrifugal solid-particle method. Moreover, Vickers hardness increases with increasing the amount of titanium particles.

Mechanical Properties of α+κ Two-phase Lamellar Structure in Fe-Mn-Al-C Alloy
Ishii Hiroaki, Ohkubo Kenji, Miura Seiji
Materials Transactions, 44, 9, 1679, 1681, Japan Institute of Metals, 2003年09月
英語, 研究論文（学術雑誌）, E2(1)-Fe3AlC carbide (kappa) in the Fe-Al-C ternary system is known to have ductility at room temperature. It forms a lamellar structure similar to the pearlite with a ferrite (alpha) phase through a eutectoid-like reaction from an austenite (gamma) phase and improved mechanical properties are expected by replacing cementite to kappa phase. The mechanical properties of alpha + kappa two-phase lamellar structure were investigated through micro-Vickers hardness measurements and compression tests at room temperature in order to compare with those of pearlite steels. A typical mean inter-lamellar spacing of Fe-8 at%Mn-13 at%Al-7 at%C alloy aged at 773 K for 100 h was 60 nm and its yield stress and micro-Vickers hardness were 1880 MPa and 580 HV, respectively. Yield stress and micro-Vickers hardness of these specimens were higher than those of pearlite steels regardless of the mean inter-lamellar spacing. Those results seem to be rationalized by taking the solid solution hardening of ferrite phase into account.

Mechanical Properties of α+κ Two-phase Lamellar Structure in Fe-Mn-Al-C Alloy
ISHII Hiroaki, OHKUBO Kenji, MIURA Seiji, MOHRI Tetsuo
Materials Transactions, 44, 9, 1679, 1681, JAPAN INST METALS, 2003年09月, ［査読有り］
英語, 研究論文（学術雑誌）, E2(1)-Fe3AlC carbide (kappa) in the Fe-Al-C ternary system is known to have ductility at room temperature. It forms a lamellar structure similar to the pearlite with a ferrite (alpha) phase through a eutectoid-like reaction from an austenite (gamma) phase and improved mechanical properties are expected by replacing cementite to kappa phase. The mechanical properties of alpha + kappa two-phase lamellar structure were investigated through micro-Vickers hardness measurements and compression tests at room temperature in order to compare with those of pearlite steels. A typical mean inter-lamellar spacing of Fe-8 at%Mn-13 at%Al-7 at%C alloy aged at 773 K for 100 h was 60 nm and its yield stress and micro-Vickers hardness were 1880 MPa and 580 HV, respectively. Yield stress and micro-Vickers hardness of these specimens were higher than those of pearlite steels regardless of the mean inter-lamellar spacing. Those results seem to be rationalized by taking the solid solution hardening of ferrite phase into account.

Phase equilibria and microstructure evolution of Al-Mo-Ti ternary alloys
R Nino, J Fujinaka, H Shimamura, S Miura, T Mohri
INTERMETALLICS, 11, 6, 611, 623, ELSEVIER SCI LTD, 2003年06月, ［査読有り］
英語, 研究論文（学術雑誌）, Phase equilibria in Ti-lean part of the Al-Mo-Ti ternary system is investigated to understand the microstructure evolution of near-equi-atomic MoAl alloys containing Ti up to 17 at.%. A partial reaction scheme is proposed based on experimental study. A high temperature ternary A2(bcc)-beta phase with Ti concentrations ranging from 13 to 17 at.% decomposes into A15 Mo3Al-D0(22) Al3Ti two-phase lamellar structure in a manner similar with a eutectoid reaction through a continuous cooling. The decomposition kinetics of the high temperature A2 phase is suppressed by adding Ti. Fine equi-axed two-phase structure is also obtained by an isothermal aging of a retained high temperature A2 phase. (C) 2003 Elsevier Science Ltd. All rights reserved.

Microstructure and mechanical properties of Al3Ti-based alloys in Al-Ti-Mo-X quaternary systems
S Miura, T Mohri
JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING, 10, 3, 47, 50, JOURNAL OF UNIV OF SCIENCE AND TECHNOLOGY BEIJING, 2003年06月
英語, 研究論文（学術雑誌）, A part of Al-Ti-Mo-Cr quaternary phase diagram is constructed for the microstructure control of D0(22)-Al3Ti or its derivative, L1(2)-(Al,Cr)(3)Ti, -based alloys. It was found that quaternary bee phase equilibrates with either D0(22)-Al3Ti or L1(2)-(Al,Cr)(3)Ti, or both, exist in large compositional areas. The mechanical properties is strongly affected by precipitates appearing, and presumably alloy microstructures.

Thermal conductivity and thermal expansion of Ir3X (X = Ti, Zr, Hf, V, Nb, Ta) compounds for high-temperature applications
Y Terada, K Ohkubo, S Miura, JM Sanchez, T Mohri
MATERIALS CHEMISTRY AND PHYSICS, 80, 2, 385, 390, ELSEVIER SCIENCE SA, 2003年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Thermal conductivity and thermal expansion for Ir3X (X = Ti, Zr, Hf, V, Nb, Ta) were measured in the temperature range between 300 and 1100 K. The thermal conductivities of Ir3X are distributed in the range from 41 to 99 W m(-1) K-1 at 300 K, while the difference of thermal conductivities becomes less emphasized at higher temperatures. The coefficients of thermal expansion (CTEs) of Ir3X are insensitive to temperature, which fall around 8 x 10(-6) K-1 at 800 K. (C) 2002 Elsevier Science B.V. All rights reserved.

Thermal conductivity and thermal expansion of L1(2) intermetallic compounds based on rhodium
Y Terada, K Ohkubo, S Miura, JM Sanchez, T Mohri
JOURNAL OF ALLOYS AND COMPOUNDS, 354, 1-2, 202, 207, ELSEVIER SCIENCE SA, 2003年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Thermal conductivity and thermal expansion were measured for the L1(2) intermetallic compounds Rh3X (X=Ti, Zr, Hf, V, Nb, Ta) in the temperature range between 300 and 1100 K to evaluate the feasibility of applying the compounds to high temperature structural materials. The thermal conductivities of Rh3X are widely distributed in the range from 32 to 103 W m(-1) K-1 at 300 K, while the difference of the thermal conductivities becomes less emphasized at higher temperatures. A trend is observed that the thermal conductivity of Rh3X is larger when the constituent X belongs to group 5 rather than 4 in the periodic table. The coefficients of thermal expansion (CTE) of Rh3X slightly increase with increasing temperature, and they are concentrated around 10 X 10(-6) K-1 at 800 K. A trend is that the CTE of Rh3X is reduced as the position of X goes downward in the periodic table. It is demonstrated that Rh3Nb and Rh3Ta are suitable for high temperature structural applications due to the larger thermal conductivities and the smaller CTE. (C) 2003 Elsevier Science B.V. All rights reserved.

Effect of additives on the phase equilibria related to the E2(1)-Fe3AlC intermetalic compound with carbon atom at the interstitial site
H Ishii, S Miura, T Mohri
DEFECT PROPERTIES AND RELATED PHENOMENA IN INTERMETALLIC ALLOYS, 753, 351, 356, MATERIALS RESEARCH SOCIETY, 2003年
英語, 研究論文（国際会議プロシーディングス）, The structure of E2(1) is a derivative of L1(2) structure with an interstitial carbon in the body center or the octahedral interstitial site. In the Fe-Al-C ternary system E2(1)-Fe3AlC intermetallic is known to precipitate in gamma-austenite alloys. For the high temperature application, the stability of microstructure is a key issue and the control of the lattice misfit is essential. By adding some elements to Fe-Al-C alloys, the lattice constant can be controlled, and enhancement of the stability of gamma-austenite + E2(1)-Fe3AlC two phase structure is expected. In this study, phase stability and lattice parameter of E2(1) phase in the (Fe-Mn)-(Al-M)-C system (M=Si, Ge) are investigated. In both systems, no significant changes in microstructures were observed within the composition range of concern. The lattice constant of E2(1)-Fe3AlC phase, however, does not show decrease with the addition of Si or Ge. This result is different from what was expected. By WDS analysis, it was revealed that Si tends to distribute mainly in gamma phase, and Ge concentrates in E2(1)-Fe3AlC phase. It was found that the lattice constants of E2(1) phases are very close to those of L1(2) structure estimated from the atomic radii of constituent elements which are evaluated from those in binary alloys and compounds. The distribution behavior of Si and Ge can be related to tolerance factor which strongly affects the stability of phases.

Thermal properties of IrAl-B2 compound with Ni, Co and Fe　　　　　　　　　　　　　　　
Proc. for Symp. on ADVANCED RESEARCH OF ENERGY TECHNOLOGY 2003, CARET, 299, 307, 2003年

Investigation on additional hardening mechanisms in off-stoichiometric Al-rich Ni3Al alloys in terms of anti-site defect configuration
S Miura, S Takizawa, Y Mishima, T Mohri
DEFECT PROPERTIES AND RELATED PHENOMENA IN INTERMETALLIC ALLOYS, 753, 33, 38, MATERIALS RESEARCH SOCIETY, 2003年
英語, 研究論文（国際会議プロシーディングス）, One of the unsettled issues of the mechanical properties of Ll(2)-Ni3Al compound is the effect of off-stoichiometry on the 0.2% flow stress at low temperature region. 0.2% flow stress at 77 K increases as deviating from the stoichiometric composition to both Ni-rich and Al-rich sides, but in Al-rich side the increasing rate is higher. According to the XRD results for the binary Ni3Al alloys, however, the composition dependence of the lattice constant is the same in both sides of the stoichiometric composition, which implies that the magnitude of lattice strain induced at off-stoichiometric composition is symmetrical. And it is not rational to associate the strengthening mechanism to a sole effect of isotropic strain due to an atomic size difference. In this study, attempts are made to explain the additional strengthening in M-rich alloys in terms of the tetragonal distortion hardening mechanism, which arises from anisotropic atomic configuration around an anti-site Al atom.

Reinvestigation of Ni-solid solution/liquid equilibria in Ni-Al binary and Ni-Al-Zr ternary systems
S Miura, H Unno, T Yamazaki, S Takizawa, T Mohri
JOURNAL OF PHASE EQUILIBRIA, 22, 4, 457, 462, ASM INTERNATIONAL, 2001年08月, ［査読有り］
英語, 研究論文（学術雑誌）, The present work reports the results of a reinvestigation of the gamma liquidus and solidus temperatures of the Ni-Al system and the gamma /Ni5Zr eutectic reaction temperatures in the Ni-Al-Zr system. In the Ni-Al binary system, it is found that the stability of the Ni-rich gamma solid solution phase is enhanced by small additions of Al with the melting temperature of the gamma phase and that the melting temperature reaches a congruent maximum at a few at.% Al. The temperature of the eutectic reaction L --> gamma + Ni5Zr in the Ni-Zr binary edge is confirmed to be 1196 degreesC by differential thermal analysis (DTA), rather higher than the value reported previously. The reaction temperature increases with Al addition to reach or exceed 1206 degreesC, forming a "saddle point," then decreasing to reach 1187 degreesC or below by flowing into a ternary invariant reaction. These findings can be explained by gamma /liquid equilibrium in the Ni-Al binary system.

Liquidus and solidus temperatures of Ni-solid solution in Ni-Al-X (X : V, Nb and Ta) ternary systems
S Miura, YM Hong, T Suzuki, Y Mishima
JOURNAL OF PHASE EQUILIBRIA, 22, 3, 345, 351, ASM INTERNATIONAL, 2001年06月, ［査読有り］
英語, 研究論文（学術雑誌）, A systematic investigation was carried out to determine both liquidus and solidus surfaces of the Ni-solid solution (gamma) in the Ni-Al-X ternary phase diagrams successively by differential thermal analysis (DTA) technique. Each of the Group V elements of the periodic table, V, Nb, and Ta, was chosen as a ternary additive X in the present study. The gamma -solvus was also taken into account in determining a temperature range for a solid solution treatment above the gamma -solvus, i.e., "the window," as well as the maximum solubility limit of gamma -Ni solid solution.

The behavior of cracking in Mo3Al-Mo3Al8 two-phase intermetallics with lamellar structures
R Nino, S Miura, T Mohri
INTERMETALLICS, 9, 2, 113, 118, ELSEVIER SCI LTD, 2001年02月, ［査読有り］
英語, 研究論文（学術雑誌）, The behavior of cracking in Mo Al intermetallics with two different interlamellar spacings is investigated by micro Vickers tests at room temperature. The experimental results show the coarse lamellar structure can suppress crack nucleation even under a high load of 9.8 N, whereas the fine one starts being cracked under a low load of 2.94 N. It contradicts to the general observation that toughness of alloys is better with finer grains. The experimental observations are discussed in terms of a fracture mechanics model including dislocation emission at the crack tip. The present model shows that stress concentration at crack tip tends to increase with decreasing interlamellar spacing. The experimental results are qualitatively explained by the present model. (C) 2001 Elsevier Science Ltd. All rights reserved.

Design of Microstruncure for ductile Mg alloy-based composites with ductile dispersoids
S Miura, T Mohri
PRICM 4: FORTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, VOLS I AND II, 1947, 1950, JAPAN INST METALS, 2001年
英語, 研究論文（国際会議プロシーディングス）, Microstructural design of Mg-based alloys is proposed. Ductile particles are added (introduced by solidification route) to be dispersed at the brittle grain boundaries in order to alleviate high stress concentration caused by a limited number of slip systems that can operate in hcp Mg alloys during plastic deformation. Based on a broad search of Mg-X binary phase diagrams, Ti is chosen as a ductile dispersoid because it equilibrates with Mg. As the proof stress of Ti is much higher than that of pure Mg, the matrix phase should have enough strength to deform Ti particles simultaneously. Several high-strength Mg alloys are selected as a matrix, and it was shown experimentally that the dispersion of Ti is effective to improve bending ductility of the composites.

Control of Microstructure by Heat Treatment to Overcome the Trade-Off Balancing in the Niobium Silicide Based MMC as Ultra-High Temperature Smart Materials　　　　　　　　　　　　　　　
Trans. Mat. Res. Soc. Japan, 26, 145, 148, 2001年

Effect of E2₁-Fe₃AlC Precipitation on Mechanical Properties of Gamma-Austenite Stabilized by Addition of Mn and Co　　　　　　　　　　　　　　　
MRS Symp. Proc., ”High-Temperature Ordered Intermetallic Alloys IX", 646, N5.20.1-N.5.20.6, 2001年

Microstructural Evolution and Mechanical Properties of Al3Ti-based Multi-Phase Alloys　　　　　　　　　　　　　　　
MRS Symp. Proc., "High-Temperature Ordered Intermetallic Alloys IX", 646, N5.15.1-N.5.15.6, 2001年

Microstructural control of Al3Ti-based alloys designed by multi-component phase diagrams　　　　　　　　　　　　　　　
Seiji Miura, Juri Fujinaka, Tetsuo Mohri
Processing and Fabrication of Advanced Materials X, 287, 300, 2001年
英語, 研究論文（国際会議プロシーディングス）, In the Al-Mo-Ti ternary system, a bcc-phase field extends from the Ti-Mo edge to high-Al region at high temperatures, and at low temperature the low Ti region is replaced partially by a two-phase region composed of an A15-Mo3Al and a D022-Al3Ti phases. It enables us to form a fine lamellar structure. Besides, most of the Ll2-trialuminides stabilizing elements also act as the bcc-βTi phase stabilizer. So, the designing of the bcc-Ll2 two-phase alloys also can be expected by adding them to the Al-Mo-Ti alloys. In order to apply such ideas for microstructural control, a series of studies on the phase relations in the Al-Mo-Ti-X quaternary systems have been carried out to introduce an Ll2-(Al,X)3Ti phase and/or bcc phase for ductile-phase toughening. It is found that, by additions of X = Cr, an Ll2-(Al,Cr)3Ti phase appears near the two-phase region composed of the D022-Al3Ti and bcc phases. By heat treatments, the D022-Al3Ti and/or Ll2-(Al,Cr)3Ti phases precipitates from the bcc phase, and no voids are observed. The mechanical properties of these alloys are also investigated by Vickers indentation tests.

Effect of E21-Fe3AlC precipitation on mechanical properties of γ -austenite stabilized by addition of Mn and Co　　　　　　　　　　　　　　　
Seiji Miura, Hiroaki Ishii, Tetsuo Mohri
Materials Research Society Symposium - Proceedings, 646, N5201, N5206, 2001年
英語, 研究論文（国際会議プロシーディングス）, Effects of Co addition on the phase relation and mechanical properties of an E21-Fe3AlC phase in the Fe-Mn-Al-C system are investigated. The relation between the γ-austenite and E21 phases is the same with Co-free alloys. Two kinds of precipitation processes of E21 phase from γ-austenite matrix are observed: a fine E21 phase precipitation and a cellular structure formation from grain boundaries. The cellular structure formation is explained in relation to the lattice mismatch evaluated by XRD. The lattice mismatch is estimated to be ∼3%, rather higher than that of γ/γ' in Ni-based superalloys, and the volume fraction of the E21-Fe3AlC phase precipitated in the γ-austenite phase is as large as 30%. The micro-vickers hardness increases with increasing Al or C, caused by the increase in the volume fraction of the E21-Fe3AlC phase.

(Nb)/(Nb, Ti)_5 Si_3 二相合金の機械的性質に及ぼすラメラー間隔の影響
関戸 信彰, 木村 好里, 韋 富高, 三浦 誠司, 三島 良直
日本金属学会誌, 64, 11, 1056, 1061, 日本金属学会, 2000年11月, ［査読有り］
日本語, 研究論文（学術雑誌）, Effects of lamellar spacing on the mechanical properties of (Nb)/(Nb, Ti)(5)Si-3 two-phase alloys with a fine lamellar structure have been investigated for an improvement in room-temperature toughness and high-temperature strength. Lamellar spacing of the ahoy are controlled, without changing the volume fraction and composition of each phase, by varying annealing temperature for the decomposition of high-temperature phase (Nb, Ti)(3)Si into (Nb) and (Nb, Ti)(5)Si-3. A Time-Temperature-Transformation diagram (TTT diagram) was determined for a Nb-25 mol%Si-10 mol%Ti ahoy. It was found that the decomposition of (Nb, Ti)(3)Si in the Nb-Si-Ti system is kinetically faster than that of Nb3Si in the binary Nb-Si system. Average lamellar spacing, lambda, of the alloy is characterized by the degree of super-cooling, DeltaT, following a relationship as "lambda proportional to1/DeltaT". Coarse lamellar structure shows better room temperature compressive plastic strain before fracture and higher elevated temperature strength. The alloys investigated in this study show superior compressive strength at over 1000 degreesC as compared with some commercial Ni-based superalloys.

Phase equilibria in Nb-Mo-rich zone of the Nb-Si-Mo ternary system
CL Ma, Y Tan, H Tanaka, A Kasama, R Tanaka, S Miura, Y Mishima, S Hanada
MATERIALS TRANSACTIONS JIM, 41, 10, 1329, 1336, JAPAN INST METALS, 2000年10月, ［査読有り］
英語, 研究論文（学術雑誌）, Microstructures and phase equilibria in cast and annealed Nb-Mo-Si alloys near the Nb-Mo binary were studied using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and electron beam microprobe analysis (EPMA). A broad range of Nb and Mo compositions were investigated for Si compositions ui, to 30 mol%. Microstructural and microchemical evidence provide a clear definition of the Nh-Mo-Si liquidus surface projection and an isothermal section diagram at 1973 K.

Compressive mechanical properties of multi-phase alloys based on B2CoAl and E2(1) Co3AlC
Y Kimura, M Takahashi, H Hosoda, S Miura, Y Mishima
INTERMETALLICS, 8, 7, 749, 757, ELSEVIER SCI LTD, 2000年07月, ［査読有り］
英語, 研究論文（学術雑誌）, Mechanical behavior of multi-phase alloys, consisting of intermetallic compounds B2 type CoAl and E2(1) type Co3AlC with primary solid solution (Co), was investigated by compression tests over a wide temperature range from 77 to 1273 K. It has been revealed that E2(1) Co3AlC is a good candidate of coexisting phase with B2 CoAl to improve the alloy's ambient temperature ductility and its elevated temperature strength. Most of the multi-phase Co-Al-C ternary alloys exhibit fairly good compressive ductility at whole test temperatures, even at 77 K. All the alloys show the anomalous positive temperature dependence of strength at intermediate temperatures. The deformation mechanism of E2(1) Co3AlC is expected to be the same as that of L1(2) intermetallic compounds because of the close resemblance of their crystal structures. The three-phase B2/E2(1)/(Co) alloy, 70Co20Al10C(at%), exhibits excellent ductility of virtually unlimited ambient temperature compressive plastic strain and the highest strength around 340 MPa at 1273 K. (C) 2000 Elsevier Science Ltd. All rights reserved.

Mechanical properties of Rh-based L1(2) intermetallic compounds Rh3Ti, Rh3Nb and Rh3Ta
S Miura, K Honma, Y Terada, JM Sanchez, T Mohri
INTERMETALLICS, 8, 7, 785, 791, ELSEVIER SCI LTD, 2000年07月, ［査読有り］
英語, 研究論文（学術雑誌）, A preliminary study of the mechanical properties of Rh-based L1(2) intermetallic compounds Rh3Ti, Rh3Nb and Rh3Ta is carried out by micro-vickers hardness tests at room temperature and compression tests at various temperatures ranging from room temperature to 1673 K. A cold-rolling test is also conducted on a Rh3Ti plate. Although high temperature ductility-loss is observed in all compounds, Rh3Ti shows good ductility at all temperatures investigated. Both Rh3Nb and Rh3Ta show a weak positive temperature dependence of strength (stress anomaly) at around 1273 K which is about half the melting point for both intermetallic compounds. The stress anomaly is discussed in terms of a phase stability concept based on the Kear-Wilsdorf (K-W) mechanism. High work hardening rates of Rh3Nb and Rh3Ta, which cause high vickers hardness at room temperature, are also attributed to the K-W mechanism. (C) 2000 Elsevier Science Ltd. All rights reserved.

Reaction-Diffusion equation for dislocation multiplication process
T Shoji, S Miura, T Mohri
MATERIALS TRANSACTIONS JIM, 41, 5, 585, 588, JAPAN INST METALS, 2000年05月, ［査読有り］
英語, 研究論文（学術雑誌）, In order to take multiple behavior of both mobile and immobile dislocations into account, Reaction-Diffusion equation is employed and a stress-strain curve is calculated. Characteristic three stages of a stress-strain curve are reproduced. The serration observed in the early stage of the deformation is interpreted based on the microscopic inhomogeneous multiplication process of dislocations leading to self-organization.

Thermal conductivity of Ni-Al powder compacts for reaction synthesis
S Miura, Y Terada, T Suzuki, CT Liu, Y Mishima
INTERMETALLICS, 8, 2, 151, 155, ELSEVIER SCI LTD, 2000年02月, ［査読有り］
英語, 研究論文（学術雑誌）, Thermal conductivity of 3Ni-1Al elemental powder compacts was measured using a laser-flash method as a function of temperature, compact density and heat treatment. Temperature dependence of thermal conductivity of the compacts is similar to that of pure Ni and Al metals. Heat treatment has a significant effect on the thermal conductivity of the compacts as particles are joined together to form Ni solid solution and intermetallic phases on powder surfaces. Fast diffusion on powder surfaces during heat treatment results in the formation of intermetallic phase zones in the interior of the former Ni particles. (C) 2000 Elsevier Science Ltd. All rights reserved.

Singularity of creep behavior in Ni3Al at stoichiometry
S Miura, Y Mishima, T Suzuki
DEFORMATION, PROCESSING, AND PROPERTIES OF STRUCTURAL MATERIALS, 255, 266, MINERALS, METALS & MATERIALS SOC, 2000年
英語, 研究論文（国際会議プロシーディングス）, Systematic investigations on both poly- and single crystalline Ni,AI have shown the existence of singularity of creep behavior at stoichiometry as well as the stress anomaly of the octahedral slip at intermediate temperatures and the athermal stress of the cube slip. We revealed that a viscous motion of dislocations on {111} plane governs the creep deformation of Ni,AI at a temperature range higher than the peak temperature, and that the mechanism governing the stress anomaly persisted its effect on the dislocation motion even at such high temperatures. There are large number of studies attempting to give an explanation for the stress anomaly with a basis of the cross-slip model proposed by Kear and Wilsdorf. Then the cross-slipped parts can be expected to move with a dragging mechanism with a diffusion mechanism at the high temperature range. The double-kink type locking parts are composed of a pair of jogs, one of which acts as a vacancy source and the other acts as a vacancy sink. For the climb motion of both of jogs, vacancy migration is required from ones to the others.
A simple model including Kear-Wilsdorf type locking mechanism is attempted to unify the singularity in both creep behavior and stress anomaly in terms of a jog-drag motion of dislocation on {111} slip plane. By taking the effect of Al concentration on inter-diffusion coefficient of Ni3Al, both the singularity at stoichiometry and the effect of the deviation from the stoichiometry on creep behavior could be explained semi-quantitatively, and a path to an extended model for the effect of solid-solution on the creep behavior will be also shown in the presentation.

Deformation behavior of Mg alloy single crystals at various temperatures
S Miura, S Yamamoto, K Ohkubo, T Mohri
MAGNESIUM ALLOYS 2000, 350-3, 183, 188, TRANS TECH PUBLICATIONS LTD, 2000年
英語, 研究論文（学術雑誌）, Temperature dependence of the deformation behavior of Mg-alloy single crystals containing 0.5 at.%Dy or Zn is investigated by compression tests at various test temperatures ranging from 77 K to 473 K. The basal slip operates and the CRSS increases with decreasing temperature at the temperature range lower than room temperature. The CRSS of Mg-Dy alloy is higher than that of Mg-Zn alloy at all the test temperatures. The activation volume and the activation energy are estimated by the strain-rate changing test. The activation volume evaluated for each alloys is almost the same, 1000-4000 b(3), and the activation energy of the Mg-Dy alloy is rather higher than that of the Mg-Zn alloy. Measurement of lattice constants of Mg-Dy polycrystals reveals that both the lattice constants of a-axis and c-axis increase linearly with increasing Dy concentration, whereas c/a ratio decreases and it deviates from the ideal value of c/a (1.633) for hcp lattice.

Characterization of phase transformations, long range order and thermal properties of Ni2MnGa alloys
H Hosoda, T Sugimoto, K Ohkubo, S Miura, T Mohri, S Miyazaki
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS, 12, 1-2, 9, 17, IOS PRESS, 2000年, ［査読有り］
英語, 研究論文（学術雑誌）, Martensitic and magnetic transformation temperatures were investigated for Ni2MnGa alloys as a function of the degree of long-range order (LRO) associated with L2(1) structure. The de ree of order was changed by changing the heat treatment temperature. Besides, thermal properties such as thermal expansion (CTE), specific heat (C-p) and thermal conductivity (A) were measured up to 1273 K. It was found that with increasing the heat treatment temperature, the degree of second neighbor ordering lowered, but that the degree of first neighbor ordering did not show good correlations with the heat treatment temperatures. Martensitic transformation temperature (M-s) and Curie temperature (T-c) vary with the square of the degree of LRO. C-p and lambda at room temperature are 29.5 Jmol(-1)K(-1) and 23.2 Wm(-1)K(-1). CTE is ranged between 15 x 10(-6)K(-1) and 34 x 10(-6)K(-1). Temperature dependence of these thermal properties is described.

Gruneisen Parameters in Intermetallic Compounds NiAl and Ni₃Al　　　　　　　　　　　　　　　
Proceedings of the 1998 International Symp. on Advanced Energy Technology, Part C: Advanced Microscopy and Its Application to Materials Science, 118, 123, 2000年

Geometrical Approach to Multicomponent Phase Diagrams　　　　　　　　　　　　　　　
Proceedings for Symp. on Advanced Research of Energy Technology 2000, 435, 442, 2000年

Thermoelectric semiconductor iron disilicides produced by sintering elemental powders
Y Ohta, S Miura, Y Mishima
INTERMETALLICS, 7, 11, 1203, 1210, ELSEVIER SCI LTD, 1999年11月, ［査読有り］
英語, 研究論文（学術雑誌）, Development of a sintering process to fabricate iron disilicides with a line grain structure is pursued using elemental powders as starting materials with additions of Al. The Al additions are expected to involve liquid Al-rich phase during sintering to accelerate the reaction kinetics. At the same time, additions are made of Co and Cu, the former being an n-type dopant while the latter might promote metal-to-semiconductor transition upon annealing after sintering. The effects of such additions on the sintering kinetics, constituent phases in the products, and their thermoelectric properties are examined. It is shown that fabrication of sintered iron disilicides using elemental powders, heretofore believed to be difficult, becomes possible with Al additions. Then a mechanism of sintering in the Fe-Si-Al ternary system is proposed, and finally a series of demonstrations is given for the changes in thermoelectric properties depending upon the doping element used. It becomes evident that the thermoelectric figure of merit of the present materials is equivalent to that of the conventionally fabricated iron disilicides. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.

Formation of microstructures in the molybdenum-aluminum-titanium ternary system through eutectoid decomposition
R Nino, S Miura, T Mohri
MATERIALS TRANSACTIONS JIM, 40, 9, 935, 937, JAPAN INST METALS, 1999年09月, ［査読有り］
英語, 研究論文（学術雑誌）, Formation and evolution processes of microstructure of Mo-Al alloys retarded by addition of 10 at%Ti are studied through various heat treatments. Fine acicular Mo,AL precipitates are observed inside a grain for a specimen quenched at 1673 K as an initial stage of the eutectoid decomposition of bcc phase. II suggests that there is a crystallographic orientation relationship between the bce matrix and A15 precipitates. By changing heat treatment conditions, fraction of fine lamellar structure decreases and spheroidized area increases. Subsequent aging treatment at lower temperature also provides the spheroidized structure. A coarse equiaxed structure is observed for a specimen quenched at 1673 K then aged at 1173 K.

Transient behavior of a stress-strain curve within Cottrell-Stokes law
T Shoji, M Ohno, S Miura, T Mohri
MATERIALS TRANSACTIONS JIM, 40, 9, 875, 878, JAPAN INST METALS, 1999年09月, ［査読有り］
英語, 研究論文（学術雑誌）, By employing stress-strain constitutive relationships within Gilman-Johnston and Alexander-Haasen models, transient behavior of calculated stress-strain curves is examined in the light of Cottrell-Stokes law. It is pointed out that the incorporation of the interaction force between mobile and immobile dislocations are indispensable to satisfy Cottrell-Stokes law.

Liquidus and solidus temperatures of Ni-solid solution in Ni-Al-X (X : Ti, Zr, and Hf) ternary systems
S Miura, YM Hong, T Suzuki, Y Mishima
JOURNAL OF PHASE EQUILIBRIA, 20, 3, 193, 198, ASM INTERNATIONAL, 1999年06月, ［査読有り］
英語, 研究論文（学術雑誌）, A systematic investigation has been tarried out to determine both the gamma liquidus and solidus surfaces above the Ni solid solution in the Ni-AI-X ternary phase diagrams successively by differential thermal analysis. Each of the group IV elements in the periodic table, Ti, Zr, and Hf, was chosen as the ternary additive X in the present study. As a basis, gamma liquidus and solidus temperatures in the Ni-Al binary system were reinvestigated and evaluated. The gamma solvus was also taken into account to determine a temperature range for a solid-solution treatment above the gamma solvus, generally called "the window;" as well as the maximum solubility limit of gamma Ni solid solution.

Phase transformation of MoSi2 phase in MoSi2/Mo5Si3 eutectic alloy containing Nb
S Ueno, T Fukui, R Tanaka, S Miura, Y Mishima
MATERIALS TRANSACTIONS JIM, 40, 5, 369, 372, JAPAN INST METALS, 1999年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Role of ternary solute element Nb on the C40 --> C11b phase transformation of the MoSi2 phase in MoSi2/Mo5Si3 eutectic alloys which occurs during heat treatment is discussed in this paper. In the case of stoichiometric MoSi2, a mixture of C40 and C11b phases can be prepared by low-pressure plasma spraying method, in which phase transformation from the metastable C40 to stable C11b is recognized during heating at around 800 degrees C. It is found that the MoSi2, phase in an as-cast eutecric MoSi2/Mo5Si3 alloy with 8.5 at%Nb consist only of metastable C40 phase. The transformation from C40 to C11b in this alloy does not occur by heating up to 1200 degrees C but a portion transforms into C11b by heating at 1400 degrees C. It is shown that the Nb concentration in C40 phase is higher than that in C11b phase in this alloy, which must be relevant to the observed transformation behavior.

MoSi₂‐Mo₅Si₃共晶材の組織および硬さに及ぼすNb,Vの影響
福井俊彦, 上野俊吉, 田中良平, 三浦誠司, 三島良直
日本金属学会誌, 63, 5, 613, 616, JAPAN INST METALS, 1999年05月, ［査読有り］
日本語, 研究論文（学術雑誌）, Effects of Nb or V additions on microstructure and hardness of MoSi2/Mo5Si3 eutectic alloys are investigated for the improvement of room temperature toughness of multi-phase intermetallic alloys based on MoSi2. Alloys prepared by the argon are melting process have compositions of 4-23 mol%Nb or 10-19 mol%V which substitutes Mo in MoSi2 and Mo5Si3 phases. Examinations are made on microstructural observation by back scattered electron image, X-ray diffraction for phase identification, the concentration of Nb or V in the constituent phases by EPMA, and Vickers hardness of the multi-phase alloys in both macro- and microscopic scales. The phase constitution changes from the two-phase, MoSi2(C11b) and (Mo, Nb)(3)Si-5, to the three-phase, MoSi2(C11b)/(Mo, Nb)Si-2 (C40)/(Mo, Nb)(5)Si-3, With increasing Nb additions. In the series of alloys with V additions, a similar shift from the two- to the three-phase is accompanied with increasing V addition. Macroscopic hardness of the multi-phase alloys with Nb addition exhibits a complex concentration dependence, in which with increasing Nb content, the hardness first decreases, exhibits a minimum and then increases back. The reason could be attributed to the fact that the hardnesses of the C40 and Glib phase have individual dependence on Nb concentration as revealed by micro-scale hardness measurement. For the improvement in toughness, Nb additions to the eutectic alloys may be preferred because the MoSi2/Mo5Si3 eutectic microstructure is fine as compared with that obtained by the V addition.

TENSILE AND CREEP RUPTURE PROPERTIES OF Co + Co₃AlC_0.5 TWO PHASE ALLOYS　　　　　　　　　　　　　　　
MRS Symp. Proc., "High-Temperature Ordered Intermetallic Alloys VIII, 552, KK5.32.1-KK5.32.6, 1999年

EFFECT OF ADDITIVES ON EUTECTOID REACTION AND MECHANICAL PROPERTIES OF Nb-Nb₅Si₃ ALLOYS　　　　　　　　　　　　　　　
High-Temperature Ordered Intermetallic Alloys VIII, MRS Symp.Proc., 552, KK6.9.1-KK6.9.5, 1999年

Formation of Microstructures in Mo-Al alloys and Its Mechanical Properties　　　　　　　　　　　　　　　
Proceedings of PTM''99, 197, 201, 1999年

The phase transformation from C40 to C11_b in Nb added MoSi₂-Mo₅Si₃ system　　　　　　　　　　　　　　　
Toshihiko Fukui, Shunkichi Ueno, Ryohei Tanaka, Seiji Miura, Yoshinao Mishima
MATERIALS TRANSACTIONS, 40, 369, 372, 1999年, ［査読有り］

Effect of additives on eutectoid reaction and mechanical properties of NbNb5Si3 alloys　　　　　　　　　　　　　　　
Seiji Miura, Yasuhiko Saeki, Tetsuo Mohri
Materials Research Society Symposium - Proceedings, 552, KK6.9.5, 1999年
英語, 研究論文（学術雑誌）

Formation of lamellar structure and its mechanical properties in Mo-Al alloys
R Nino, S Miura, T Mohri
JAPAN INSTITUTE OF METALS, PROCEEDINGS, VOL 12, (JIMIC-3), PTS 1 AND 2, 197, 200, JAPAN INST METALS, 1999年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, Formation and evolution processes of microstructure of Mo-Al alloys are investigated through various heat treatments. A fine lamellar structure is observed for a specimen quenched at 1773K and it spheroidizes by subsequent aging treatment at low temperature. A coarse lamellar structure grown from a primary Mo3Al phase is also observed. Micro Vickers hardness shows little dependence on microstructure. The size, not morphology, of microstructure plays primary role for the suppression of crack initiation and propagation.

Phase Transformation of MoSi2 Phase in MoSi2/Mo5Si3 Eutectic Alloy Containing Nb
S. Ueno, T. Fukui, R. Tanaka, S. Miura, Y. Mishima
Materials Transactions, 40, 5, 369, 372, 日本金属学会, 1998年05月01日, ［査読有り］
英語, 研究論文（学術雑誌）

Mechanical Properties of Co-Base Alloys Strengthened by E2₁-Type Intermetallic Compound Co₃AlC　　　　　　　　　　　　　　　
The Third Pacific Rim International Conf. on Advanced Materials and Processing (PRICM 3), 2355, 2360, 1998年

Microstructure and Ductility of Multi-Phase Intermetallic Alloys in the Nb-Si-Ti System　　　　　　　　　　　　　　　
The Third Pacific Rim International Conf. on Advanced Materials and Processing (PRICM 3), 2393, 2398, 1998年

Mechanical Properties of Mo-Al Alloys with Lamelar Structure　　　　　　　　　　　　　　　
The Third Pacific Rim International Conf. on Advanced Materials and Processing (PRICM 3), 2317, 2322, 1998年

High-temperature creep behavior in Ni-3(Al, Ta) single crystals with different orientations
ZL Peng, S Miura, Y Mishima
MATERIALS TRANSACTIONS JIM, 38, 7, 653, 655, JAPAN INST METALS, 1997年07月, ［査読有り］
英語, 研究論文（学術雑誌）, High temperature creep behavior of a nickel-rich Ni-3(AI, Ta) with the Ll(2), structure is investigated in order to clarify the influence of crystallographic orientation. The single crystals with four different orientations are deformed in compressive creep at the temperatures ranging from 1123 to 1273 K under a constant load with initial shear stresses being from 35 to 120 MPa for the (111)[ (1) over bar 01] slip system. The results show a distinct orientation dependence of creep strength, although shape of creep curves, stress exponent and the activation energy seem to be independent on orientation. It is shown, however, that the internal stress measured by strain transient dip tests is found to be orientation-dependent and that the creep behavior is independent on orientation if these are analyzed with the effective stress instead of the applied shear stress.

L1(2)(Al,Cr)(3)Ti-based two-phase intermetallic compounds .1. Plastic deformation behavior
JY Park, MH Oh, DM Wee, S Miura, Y Mishima
SCRIPTA MATERIALIA, 36, 7, 795, 800, PERGAMON-ELSEVIER SCIENCE LTD, 1997年04月, ［査読有り］
英語, 研究論文（学術雑誌）

Fabrication of ternary iron disilicides as thermoelectric semiconductors by sintering using elemental powders
Y Ohta, S Miura, Y Mishima
PROCEEDINGS ICT'97 - XVI INTERNATIONAL CONFERENCE ON THERMOELECTRICS, 295, 298, IEEE, 1997年
英語, 研究論文（国際会議プロシーディングス）, Sintering process to fabricate iron disilicides with a fine grain structure is pursued using elemental powders as starting materials. Additions of Al to the binary Fe-Si system are attempted. This is because Al has a considerably lower melting point than Fe and Si and hence liquid Al phase would be involved upon sintering to help accelerating the reaction kinetics to form iron disilicides. Sintering of ternary iron disilicides is attempted also with additions of Co and Cu, the former being an n-type dopant while the latter might promote metal-to-semiconductor transition upon annealing after sintering. Effects of such additions are examined on the sintering kinetics, constituent phases in the products, and their thermoelectric properties. It is shown that fabrication of sintered iron disilicides using elemental powders becomes possible with Al additions, for which a mechanism of sintering in the Fe-Si-Al ternary system is proposed. Also a series of demonstration is given for the changes in thermoelectric properties with difference in doping element.

Orientation dependence of high temperature creep strength and internal stress in Ni3Al alloy single crystals
S Miura, ZL Peng, Y Mishima
HIGH-TEMPERATURE ORDERED INTERMETALLIC ALLOYS VII, 460, 431, 436, MATERIALS RESEARCH SOCIETY, 1997年
英語, 研究論文（国際会議プロシーディングス）, High temperature creep behavior of a nickel-rich Ni-3(Al,Ta) with the L1(2) structure is investigated in order to clarify the influence of crystallographic orientation with respect to the stress axis. The single crystals with four different orientations are deformed in compressive creep at temperatures ranging from 1123 to 1273 K under a constant load, initial shear stress being 35 to 120 MPa for (1 1 1)[ (1) over bar 0 1] slip system. The results show a distinct orientation dependence of creep strength, although shape of creep curves, stress exponent and the activation energy seem to be independent of the orientation. It is shown, however, the internal stress, being measured by strain transient dip tests, is found to be orientation dependent and the creep behavior is independent on orientation if it is interpreted using the effective stress instead of the applied shear stress.

Amount of liquid phase during reaction synthesis of nickel aluminides
S Miura, T Ohashi, Y Mishima
INTERMETALLICS, 5, 1, 45, 59, ELSEVIER SCI LTD, 1997年, ［査読有り］
英語, 研究論文（学術雑誌）, Intermetallic phases and the liquid phase are estimated using thermodynamic calculations as a function of temperature, the amount of phases and diluents, and Ni concentration in liquid Al during the reaction synthesis for Ni-Al binary alloys having arbitrary compositions under an adiabatic condition. Calculations use available thermodynamic data concerning intermetallic compounds and the liquid phase. Reaction synthesis experiments are then performed on compactions of powder mixtures which have several binary compositions. The effect of some fundamental conditions which relate to the conditions for calculation are investigated and the results obtained are discussed in terms of the amount of liquid phase estimated. It is found that the calculated amount of liquid phase in Ni-Al elementary powder compacts during the synthesis reaction are in good agreement with the experimental results; however, other factors are needed to understand the densification behavior of specimens with diluents such as liquid migration and formation of a skeleton structure. (C) 1996 Elsevier Science Limited.

Improvement in room temperature ductility of intermetallic alloys through microstructural control
Y Mishima, M Kato, Y Kimura, H Hosoda, S Miura
INTERMETALLICS, 4, S171, S179, ELSEVIER SCI LTD, 1996年, ［査読有り］
英語, 研究論文（学術雑誌）, A summary is presented of the recent advances in the development of multiphase intermetallic alloys towards improved room temperature ductility investigated by the present authors. The alloy systems of interest are Ni-Al-Be, Co-Al-Ni-Ti, and Co-Al-C, in which two- or three-phase alloys can be designed involving the L1(2), B2 and the primary solid solution, hereby denoted as (Ni) or (Co,Ni) in the first two systems, while the B2, E2(1), and the primary solid solutions, denoted as (Co) in the latter system. It is shown that by choosing a proper combination of phases with particular morphologies, good room temperature ductility can be obtained not only by compression and bending tests but also by tensile tests. Such a strategy has been so far most successful in the Co-Al-Ni-Ti system, where room temperature ductility of near to 20% is achieved in a B2/L1(2)/(Co,Ni) three-phase alloy. It is pointed out that keys to design ductile multi-phase intermetallic alloys would be: (1) refinement of the microstructure utilizing solid state phase transformations such as an invariant reaction; (2) adjustment of amounts and compositions of the constituent phases, which is not possible in the binary system, but is in a multi-component system, and (3) hot fabrication to reduce solidification defects. Copyright (C) 1996 Elsevier Science Ltd.

DISLOCATION MORPHOLOGY, STRUCTURE AND DENSITY ON (001) SLIP PLANE IN NI-3(AL,TI) SINGLE-CRYSTALS DEFORMED AT ELEVATED-TEMPERATURES
S MIURA, JA HORTON, CT LIU, T SUZUKI, Y MISHIMA
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 192, 769, 773, ELSEVIER SCIENCE SA, 1995年02月, ［査読有り］
英語, 研究論文（学術雑誌）, Ni3Al single crystals with the L1(2) structure and with a [123] orientation with respect to the stress axis were deformed by compression at temperatures above T-p, the yield stress peak temperature, so that (001) cube slip dislocations were introduced. The dislocation morphology, configuration and density on (001) slip planes were examined as functions of the deformation temperature, strain rate and strain by transmission electron microscopy. It was found that dislocations on the cube plane were predominantly of edge character and that within the range studied the dislocation density was largely independent of the deformation temperature, strain rate and strain.

Microstructure and mechanical properties of the L12/L21 two-phase alloys in the quaternary Co-Al-Ni-Ti system　　　　　　　　　　　　　　　
Takeo Matano, Yoshisato Kimura, Seiji Miura, Yoshinao Mishima
Materials Research Society Symposium - Proceedings, 364, 2, 1377, 1382, Materials Research Society, 1995年
英語, 研究論文（国際会議プロシーディングス）, An attempt is made to develop a two-phase alloy consisting of the L12 and L21 (Heusler) phases in the Co-Al-Ni-Ti quaternary system exhibiting a high elevated temperature strength as well as some room temperature ductility as a new class of heat resisting structural materials. The idea behind this approach is expectations for the L21 phase to provide high elevated temperature strength, whereas the L12 phase provides some room temperature ductility. Compositional optimization in the room temperature ductility of the L12 (Co,Ni)3(Al,Ti) is first carried out and then, based on the result, several L12/L21 two phase alloys are designed. It is found that a few to several per cent room temperature bend ductility is obtained in such two-phase alloys.

PHASE-STABILITY AND RELATIONS OF MULTIPHASE ALLOYS BASED ON B2 COAL AND E2(1) CO3ALC
Y KIMURA, M TAKAHASHI, S MIURA, T SUZUKI, Y MISHIMA
INTERMETALLICS, 3, 5, 413, 425, ELSEVIER SCI LTD, 1995年, ［査読有り］
英語, 研究論文（学術雑誌）, The Co-Al-C ternary phase diagram has been experimentally examined for the Co-corner with a particular interest in phase relations among cobalt primary solid solutions, denoted as (Go), the E2(1) type intermetallic compound Co3AlC, and the B2 type CoAl. Liquidus surface composed with monovariant and contour lines, and corresponding reaction scheme were determined by optical microscopy, differential thermal analysis, X-ray diffraction, and energy dispersive X-ray spectroscopy. Several isothermal sections and isoplethals with respect to a fixed concentration for one of the elements were also evaluated. It is shown that such multiphase alloys as B2/E2(1), B2/(Co), and B2/E2(1)/(Co) can be produced in the ternary system by proper choices of alloy chemistry and heat treatment.

Plastic behavior of two-phase intermetallic compounds based on L1(2)-type (Al,Cr)(3)Ti
JY Park, MH Oh, DM Wee, S Miura, Y Mishima
GAMMA TITANIUM ALUMINIDES, 377, 384, MINERALS, METALS & MATERIALS SOC, 1995年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

PHASE STABILITY AND MECHANICAL PROPERTIES OF MULTI-PHASE ALLOYS BASED ON THE B2 COAL AND THE E21 CO3ALC
Y KIMURA, M TAKAHASHI, S MIURA, Y MISHIMA
HIGH-TEMPERATURE ORDERED INTERMETALLIC ALLOYS VI, PTS 1 AND 2, 364, 1371, 1376, MATERIALS RESEARCH SOC, 1995年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Effect of deviation from the stoichiometry on the lattice constants and strength of the L1(0) TiAl-X (X=Cr, V or Nb) alloys at ambient temperature
E Kobayashi, K Shinmoto, S Miura, T Suzuki, Y Mishima
GAMMA TITANIUM ALUMINIDES, 347, 352, MINERALS, METALS & MATERIALS SOC, 1995年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

THERMODYNAMICAL ESTIMATIONS ON THE AMOUNT OF LIQUID PHASE DURING REACTION SYNTHESIS OF NICKEL-ALUMINIDES
S MIURA, Y MISHIMA
HIGH-TEMPERATURE ORDERED INTERMETALLIC ALLOYS VI, PTS 1 AND 2, 364, 561, 566, MATERIALS RESEARCH SOC, 1995年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Phase stability, microstructure and mechanical properties in the multi-phase alloys based on the L12-Ni3(Al,Be)
Takahiro Matsuo, Hideki Hosoda, Seiji Miura, Yoshinao Mishima
Materials Research Society Symposium - Proceedings, 364, 855, 860, Springer Science and Business Media LLC, 1995年01月, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, Intermetallic alloys based on the L12 Ni3(Al,Be) phase in the ternary Ni-Al-Be system are prepared so that the alloys are multi-phase with the B2 intermetallic compound NiBe and a Ni primary solid solution denoted as (Ni). Such three-phase alloys, Ni-16 to 20 at%Al-10 at%Be, exhibit good room temperature ductility as measured by four-point bending. In order to examine the phase stabilities and relations among constituent phases, a vertical section of the ternary system is constructed at a constant 10 at%Be mainly by differential thermal analysis. It is found that improvement in room temperature ductility can be achieved by the formation of a fine mixture of constituent phases during invariant reactions during solidification, which is further enhanced by the co-existence of the L12 phase formed as the primary solidification phase.

MICROSTRUCTURE AND MECHANICAL-PROPERTIES OF 2-PHASE ALLOYS BASED ON THE B2-TYPE INTERMETALLIC COMPOUND COAL IN THE CO-AL-NI TERNARY-SYSTEM
Y KIMURA, S MIURA, T SUZUKI, Y MISHIMA
MATERIALS TRANSACTIONS JIM, 35, 11, 800, 807, JAPAN INST METALS, 1994年11月, ［査読有り］
英語, 研究論文（学術雑誌）, Various two- or three-phase alloys were prepared based on the B2 intermetallic compound CoAl in the Co-Al-Ni ternary system, in which the B2 phase forms a continuous solid solution with NiAl of the same ordered structure. Combination of the phases with the B2 phase can be the (Co, Ni) primary solid solution phase being also continuous from Co to Ni-corners, and/or the L1(2) phase based on Ni3Al. Then the relationship between microstructure and mechanical properties were systematically investigated by optical and transmission electron microscopy and by micro-Vickers hardness and compression tests. It is found that two-phase alloys of B2/Ll(2) show superior room temperature ductility with over 10% plastic strains to those of B2/(Co, Ni). The present work is based on the seemingly ever lasting motivation to provide some ductility to the intrinsically brittle CoAl compound which unless otherwise has attractive properties as a new high-temperature structural material.

高剛性・超低密度炭素繊維/アルミニウム合金複合材料の製造研究 (FMPT:First Material Processing Test<特集>) -- (FMPT実験結果の概要)
三島 良直, 三浦 誠司, 鈴木 朝夫
日本航空宇宙学会誌, 42, 489, 605, 609, 日本航空宇宙学会, 1994年10月, ［査読有り］
日本語

PHASE-RELATIONS IN THE CO-AL-NI TERNARY-SYSTEM FOR THE DEVELOPMENT OF MULTIPHASE ALLOYS BASED ON B2 INTERMETALLIC COMPOUND
Y KIMURA, S MIURA, T SUZUKI, Y MISHIMA
EXPERIMENTAL METHODS OF PHASE DIAGRAM DETERMINATION, 113, 121, MINERALS, METALS & MATERIALS SOC, 1994年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

EFFECTS OF ALUMINUM CONCENTRATION AND COMPACT THICKNESS ON REACTION SYNTHESIS OF NI3AL-NIAL ALLOYS
S MIURA, CT LIU
INTERMETALLICS, 2, 4, 297, 313, ELSEVIER SCI LTD, 1994年, ［査読有り］
英語, 研究論文（学術雑誌）, The effects of aluminum concentration and green compact thickness on the reaction synthesis of powder compacts containing 25 to 40 at. %Al were studied under a uniaxial compressive stress of 10 MPa. The results indicate that both reaction product and material density are sensitive to these two parameters. For all powder compacts with a thickness of 5 mm, no temperature increase was detected during reaction synthesis, indicating no formation of transient liquid phases and thus no self-sustaining combustion reaction. For 6- and 7-mm-thick compacts containing 40% Al, a full synthesis reaction took place, resulting in production of the NiAl alloy with a high material density (>98%) and a fine grain size (14 mum). Other compacts containing 25 and 30% Al showed a coexistence of partially and fully reacted zones, with the reaction zone size strongly dependent on aluminum concentration and compact thickness. All the results are discussed in terms of local heat accumulation and heat transfer as well as thermodynamic analyses of exothermic reactions during each reaction step.

Microstructure and room temperature mechanical properties of a Ni3Al/NiBe alloy
Yoshinao Mishima, Seiji Miura, Takahiro Matsuo, Hideki Hosoda
Proceedings of the TMS Fall Meeting, 191, 197, 1994年, ［査読有り］
Development of microstructure is examined in a Ni-20at%Al-10at%Be alloy based on the L12 phase having the B2 NiBe as a second phase. To be consistent with the information on the isothermal section reported previously, a vertical section at a constant 10 at%Be is constructed mainly by differential thermal analysis. The microstructures of as-cast and annealed alloy specimens are discussed with the isoplethal obtained, and then the possibility for the Ni-primary solid-solution phase to co-exist as a third phase is suggested. It is also shown that a fine mixture of the L12 and the B2 phases may arise from two invariant reactions occurring during solidification. Then room-temperature mechanical properties are evaluated by tensile, bending and compression tests to reveal that the alloy exhibits excellent ductility.

Design of Ductile Ni3Al Being Two Phase with NiBe　　　　　　　　　　　　　　　
Y. Mishima, S. Miura, T. Suzuki, T. Matsuo, H. Hosoda
Alloy Modeling and Design, TMS, 275, 282, 1994年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Development of Ductile Polycrystalline Ni3Al by Microstructural Control　　　　　　　　　　　　　　　
H. Hosoda, S. Miura, T. Suzuki, Y. Mishima
3rd Jpn Intl. SAMPE Symp., Intl. Symp. Intermetallic Compounds for High-Temperature Structural Applications, 1193, 1197, 1993年, ［査読有り］

10at%Tiの添加によって単結晶化したNi₃Siの変動挙動
三浦誠司, 小池基行, 三島良直, 鈴木朝夫
日本金属学会誌, 56, 11, 1343, 1351, JAPAN INST METALS, 1992年11月, ［査読有り］
日本語, 研究論文（学術雑誌）, The plastic behavior of Ni3 (Si, Ti) single crystals with 10 at%Ti is investigated, and the effects of temperature, strain-rate and crystallographic orientation with respect to stress axis are examined. An appreciable orientation dependence of critical resolved shear stress (CRSS) is found at 77 K, where the CRSS increases as the orientation shifts from [001] toward [111BAR]. The apparent activation energy for the positive temperature dependence of strength, U, is evaluated to be 7.1 to 7.7 kJ/mol which is smaller than Ti free Ni3Si and is in good agreement with that expected from the data in polycrystals. For orientation near [001], where the octahedral viscous flow governs the steady-state deformation following characteristic yield drop, the stress exponent is found to be about 7 which is considerably higher than the values of 3.5-5 in other L1(2) compounds. The decrement in CRSS by the yield drop is unusually small as compared to the other L1(2) single crystals. The activation energy for the steady-state deformation is evaluated to be comparable to the value for diffusion of Si in Ni3Al. A good oxidation resistance of the alloy is also made clear in the present work.

76at%Niを含むNi₃Ge単結晶の変形挙動
三浦誠司, 小池基行, WANG K, 三島良直, 鈴木朝夫
日本金属学会誌, 56, 10, 1207, 1213, JAPAN INST METALS, 1992年10月, ［査読有り］
日本語, 研究論文（学術雑誌）, In order to make a comparison of the plastic behaviour between Ni3Al and Ni3Ge, where Al is a 3B and Ge a 4B-subgroup element, effects of temperature, orientation and strain-rate on the temperature dependence of strength are investigated in Ni3Ge single crystals with 76 at%Ni. It is found that at 77 K there is an appreciable orientation dependence in compressive 0.2% flow stress. For orientation near [111BAR], the onset of cube slip is found to occur at as low as ambient temperature which is unusual for the L1(2) single crystals. The thermal component of critical resolved shear stress for the cube slip vanishes also at a much lower temperature and the athermal component is found to exhibit a slight negative temperature dependence arising from the temperature dependence of shear modulus. For orientation near [001] and at the temperatures above the peak, the characteristic yield drop and the following steady-state deformation are found as in other L1(2) intermetallic compounds. The activation energy for the steady-state deformation is found to be 277 kJ/mol mol which is reasonably in good agreement with the value for the diffusion of Ge in Ni3Ge.

IVB亜族元素Siを添加したNi₃Al単結晶の変形挙動
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会誌, 56, 10, 1200, 1206, JAPAN INST METALS, 1992年10月, ［査読有り］
日本語, 研究論文（学術雑誌）, The temperature, strain-rate and orientation dependences of strength are investigated in single crystalline Ni3 (Al, 5.0Si), and the results are compared with those on Ni3 (Al, 2.5Si) single crystals reported previously by the present authors. The magnitude of the anomalous positive temperature dependence of strength is found to increase with increasing Si additions and the value of activation energy to yield the mechanical anomaly is found to be in good accordance with that being predicted from the data for polycrystals. For an orientation near [111BAR], where the cube slip governs the plastic behaviour above the peak temperature, the temperature and strain-rate dependences of strength are found to differ considerably from what was found in Ni, (Al, 2.5Si). This is shown to be caused by the difference in the deviation from stoichiometry and not by the difference in Si content of the alloys. On the other hand, the steady-state deformation behaviour being governed by the octahedral viscous flow for the orientation near [001] resembles that in Ni3(Al, 2.5Si), where the stress exponent as well as the activation energy for the deformation is found to be nearly identical. The activation energy evaluated is of the same order as that for diffusion of Si in Ni3Al.

両サイト置換型元素Crを含むNi₃Al単結晶の変形挙動
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会誌, 56, 10, 1214, 1220, JAPAN INST METALS, 1992年10月, ［査読有り］
日本語, 研究論文（学術雑誌）, The temperature, orientation and strain-rate dependences of strength are investigated in single crystalline Ni3Al-4Cr (74 at%Ni-22 at%Al-4 at%Cr) in which Cr substitutes both Ni and Al sites. It is found that the solid solution hardening evaluated at 77 K by Cr addition is small and that the activation energy for the thermally activated cross slip yielding the mechanical anomaly becomes slightly larger by the addition. In the temperature range and for an orientation near [111BAR] where cube slip governs the plastic deformation, the athermal component of the critical resolved shear stress (CRSS) is evaluated to be as small as 40 MPa, whereas the thermal component at 0 K is estimated to be 2250 MPa being as large as the value reported for the Ni-rich Ni3Al single crystals. For an orientation near [001], where the octahedral viscous flow governs the plastic behaviour, the activation energy for the steady-state deformation is evaluated to be 317 kj/mol which is in good agreement with the value for diffusion of Cr in Ni3Al. It is also found that the oxididation resistance of Ni3Al-4Cr is superior to Ni3 (Al, 5.0Ti) but is inferior to Ni3 (Al, 5.0Si). It is concluded, therefore, that the stoichiometry of Ni3Al-Cr cannot be made unequivocally.

擬2成分系金属間化合物Co₃Ti・Ni₃Al単結晶の塑性変形挙動
三浦誠司, 栗山春宣, 三島良直, 鈴木朝夫
日本金属学会誌, 56, 8, 943, 951, JAPAN INST METALS, 1992年08月, ［査読有り］
日本語, 研究論文（学術雑誌）, Single crystalline Co3Ti base quarternary compounds, (Co, Ni) 3 (Ti, Al), are prepared and the effects of temperature, strain rate and orientation on the plastic behavior are investigated. Then the results are compared to other L1(2) intermetallic compounds being represented by Ni3Al. The differences found by the comparison are as follows. (1) Regardless of the crystallographic orientation with respect to the stress axis, there is a strong negative temperature dependence of strength at low temperature regime. (2) Plastic deformation is accompanied by serration on the stress strain curve and by metallic acoustic emission in the single crystals with near-[111] orientation and at temperature regime between 77 to 973 K where the anomalous positive temperature dependence of strength is observed. (3) For the same orientations, the temperature regime where cube slip governs the plastic deformation is narrow. (4) Octahedral viscous flow at the high temperature regime is not associated with well-defined yield drop. It is to be noted that the plastic behavior of Co3Ti base single crystals should also be discussed seperately in the above four regimes as has been done in other single crystalline L1(2) compounds.

ENVIRONMENTAL-EFFECT ON MECHANICAL-PROPERTIES OF L12-ORDERED (FE22CO78)3V
S MIURA, CT LIU
SCRIPTA METALLURGICA ET MATERIALIA, 26, 11, 1753, 1758, PERGAMON-ELSEVIER SCIENCE LTD, 1992年06月, ［査読有り］
英語, 研究論文（学術雑誌）

Positive temperature dependence of strength observed in ordered cu3pt single crystals
S. Miura, K. Mitsui, Y. Tanaka, Y. Mishima, T. Suzuki
Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties, 65, 3, 737, 747, 1992年, ［査読有り］
英語, 研究論文（学術雑誌）, The composition and temperature dependences of strength of ordered and disordered single crystalline Cu3Pt alloys involving ternary additions are investigated. The relation between deformation behaviour and relative phase stability of L12 ordered phase with respect to L12−s long period ordered phase is discussed in relation to the antiphase domain (APD) morphology observed in each alloy. Direct observation of APDs by transmission electron microscopy shows that maze-like APDs are formed during ordering in Cu-23at.%Pt alloy, while in (Cu-23at.%Pt)-1 at.%In and Cu-19at.%Pt alloys swirl-like APDs are formed. This implies that the relative phase stability of L12 phase with respect to L12− phase in Cu-23 at.%Pt alloy is lower than that in (Cu-23at.Pt)-l at.%In and Cu-19at.%Pt alloys. Compression tests of an ordered single crystal of each alloy at various temperatures reveal a positive temperature dependence of critical resolved shear stress (CRSS) in Cu-23 at. %Pt alloy, but not in (Cu-23 at.%Pt)-1 at.%In and Cu-19at.%Pt alloys. Also, it is shown that disordered Cu-23 at.%Pt alloy dose not exhibit the positive temperature dependence of the CRSS. On the basis of these facts, it is demonstrated that the Kear-Wilsdorf mechanism involving thermally activated cross slip from the (111) primary glide plane to (010) non-glide plane is responsible for the positive temperature dependence of strength in ordered Cu-23 at.%Pt alloy. © 1992 Taylor &
Francis Group, LLC.

EVALUATION OF THE DATA FOR THE PLASTIC BEHAVIOR OF NI-3 (AL, X) SINGLE-CRYSTALS
T SUZUKI, Y MISHIMA, S MIURA
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 146, 1-2, 245, 260, ELSEVIER SCIENCE SA, 1991年10月, ［査読有り］
英語, 研究論文（学術雑誌）, All the available shear stress data for various kinds of L1(2) single crystals which have been reviewed in 1989 are revised with the recent progress obtained with the last 2 years. Most of the findings in that review are strengthened further by the introduction of new data. Besides this, it is pointed out that the shear stress of L1(2) compounds such as Ni3Ge and Ni3Si with a strong positive temperature dependence of strength have a tendency not to obey Schmid's law at low temperatures. At elevated temperatures, it is shown that the relation between shear stress and shear strain for the steady state stress obtained in the constant-strain-rate test and the strain rate obtained in the constant-load test, i.e. the creep test, can be expressed by a single straight line. The composition dependence of the creep resistance in Ni3Al is the most interesting result found. The creep resistance increases with increasing nickel concentration on both sides of stoichiometry but the value extrapolated to stoichiometry from the nickel-rich side is much larger than that extrapolated from the aluminium-rich side. The problems which must be solved in this field are suggested.

THE CRSS FOR CUBE SLIP IN NI-3(AL,X) SINGLE-CRYSTALS AT ELEVATED-TEMPERATURES
S MIURA, Y MISHIMA, T SUZUKI
ZEITSCHRIFT FUR METALLKUNDE, 80, 3, 157, 163, CARL HANSER VERLAG, 1989年03月, ［査読有り］
英語, 研究論文（学術雑誌）

THE CRSS FOR OCTAHEDRAL SLIP IN NI-3(AL,X) SINGLE-CRYSTALS AT ELEVATED-TEMPERATURE
S MIURA, Y MISHIMA, T SUZUKI
ZEITSCHRIFT FUR METALLKUNDE, 80, 3, 164, 169, CARL HANSER VERLAG, 1989年03月, ［査読有り］
英語, 研究論文（学術雑誌）

Ni3(Al,X)単結晶の高温強度
三島 良直, 三浦 誠司, 鈴木 朝夫
熱処理, 29, 1, p19, 24, 日本熱処理技術協会, 1989年02月, ［査読有り］
日本語

ACTIVATION-ENERGY FOR THE STRENGTH ANOMALY IN NI3(AL,X) SINGLE-CRYSTALS
S MIURA, Y MISHIMA, T SUZUKI
ZEITSCHRIFT FUR METALLKUNDE, 80, 2, 112, 117, CARL HANSER VERLAG, 1989年02月, ［査読有り］
英語, 研究論文（学術雑誌）

SOLID-SOLUTION HARDENING IN NI3(AL,X) SINGLE-CRYSTALS
S MIURA, Y MISHIMA, T SUZUKI
ZEITSCHRIFT FUR METALLKUNDE, 80, 1, 48, 52, CARL HANSER VERLAG, 1989年01月, ［査読有り］
英語, 研究論文（学術雑誌）

EFFECT OF STRAIN RATE ON THE PLASTIC BEHAVIOR OF LL2 COMPOUNDS BASED ON NI3AL
S MIURA, S OCHIAI, Y OYA, Y MISHIMA, T SUZUKI
HIGH-TEMPERATURE ORDERED INTERMETALLIC ALLOYS III, 133, 341, 346, MATERIALS RESEARCH SOC, 1989年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

PLASTIC BEHAVIOR IN NI3 (AI,X) SINGLE-CRYSTAL - TEMPERATURE, STRAIN-RATE, ORIENTATION AND COMPOSITION
T SUZUKI, Y MISHIMA, S MIURA
ISIJ INTERNATIONAL, 29, 1, 1, 23, IRON STEEL INST JAPAN KEIDANREN KAIKAN, 1989年
英語

Ni₃(Al,Ti)単結晶の流動応力におよぼす歪速度の影響
三浦誠司, 落合鍾一, 大矢義博, 三島良直, 鈴木朝夫
日本金属学会誌, 51, 5, 400, 406, JAPAN INST METALS, 1987年, ［査読有り］
日本語, 研究論文（学術雑誌）

Ni₃(Al,Ti)単結晶における高温降伏現象
落合鍾一, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会誌, 51, 7, 608, 615, JAPAN INST METALS, 1987年, ［査読有り］
日本語, 研究論文（学術雑誌）

γ’析出型Ni基超合金における長周期規則構造の形成
山下麻衣, 大野直子, 鵜飼重治, 林重成, 三浦誠司, AGHAMIRI S. M. S., 金野杏彩, 金野杏彩, 光原正寿, 日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2018, 2019年

γ’析出型Ni基超合金における逆位相境界と超格子部分転位の相互作用
山下麻衣, 鵜飼重治, 大野直子, 三浦誠司, AGHAMIRI S. M. S., 光原正寿, 日本金属学会講演概要(CD-ROM), 164th, 2019年

Niフリー超弾性材料としてのMg合金におけるひずみ回復挙動
峯田才寛, 佐藤裕之, 三浦誠司, 細田秀樹, 生体医歯工学共同研究拠点成果報告書, 2017, 2018年

Niフリー超弾性材料としてのMg合金におけるひずみ回復挙動
峯田才寛, 佐藤裕之, 三浦誠司, 細田秀樹, 生体医歯工学共同研究拠点成果報告会, 2017, 2018年

テトラアーク引上炉を用いて作製したNb-Re-Si合金の断面組織と1150°Cにおける等温断面図の検討
齋藤繁, 堀内寿晃, 高島敏行, 三浦誠司, 成田敏夫, 日本金属学会講演概要(CD-ROM), 162nd, 2018年

Mg-RE(RE=Y,Dy,Gd)合金多結晶における{11-21}双晶の活動性
峯田才寛, 佐藤裕之, 三浦誠司, 日本金属学会講演概要(CD-ROM), 161st, 2017年

改良型顕微インデンテーション法によるMg単結晶及び多結晶における変形挙動のその場観察
峯田才寛, 三浦誠司, 岡和彦, 宮島達也, 佐藤裕之, 日本機械学会M&M材料力学カンファレンス(CD-ROM), 2017, 2017年

Co-Nb2元系合金の相変態挙動の高温EBSD測定によるその場観察
新保右京, 阿部滉平, 堀内寿晃, 遠堂敬史, 池田賢一, 三浦誠司, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2016, 2016年

薄片4点曲げ試験を用いたMg-Zn-Y系合金の変形挙動の評価
池田賢一, 西尾理恵, GAO Hongye, 波多聰, 中島英治, 三浦誠司, 軽金属学会大会講演概要, 128th, 2015年

シンクロ型LPSO構造相を有する結晶性材料の薄片4点曲げ試験による変形挙動評価
池田賢一, 西尾理恵, 高紅叶, 波多聰, 中島英治, 三浦誠司, 日本金属学会講演概要(CD-ROM), 157th, 2015年

高融点ニオブ基合金の組織設計のための高温破壊高速その場観察装置の開発
三浦誠司, 岩谷直治記念財団研究報告書, 36, 92, 94, 2013年08月01日
日本語

TiPt base high temperature shape memory alloys
Y. Yamabe-Mitarai, T. Hara, T. Kitashima, S. Miura, H. Hosoda, Ti 2011 - Proceedings of the 12th World Conference on Titanium, 2, 870, 874, 2012年12月01日
TiNi is one of the most excellent practical shape memory alloys and used as eyeglass frame,micro actuator,medical devices,and so on. Recently, the demand of high-temperature shape memory alloys is increasing to use them in gas turbines,rocket engines,automotive engines,and nuclear reactor environments. However, the martensitic transformation temperature related with the shape memory effect of TiNi is below 373 K. New alloy system should be developed to suffuse the demand. We have focused on TiPt as new high-temperature shape memory alloys due to its high martensitic transformation temperature from the B2 to B19 phases above 1173 K. The effect of Ir addition to TiPt on phase transformation and the shape memory effect has been investigated for TiM(Pt,Ir)so with Ir contents between 5 and 37. 5at%. The phase transformation temperature increased with increasing Ir contents. Relatively large strain recovery rate was obtained in Ti50(Pt,Ir)50with 10-30at%Ir. The highest shape recovery rate was 57% in Ti-25Pt-25Ir after deformation at 1123 K, followed by heating to above Af. Strain recovery of Ti50(Pt, Ir)50is discussed along with volume change between the B2 and B19 phases during phase transformation,lattice parameter change depending on Ir contents.and microstructure.

高Ni鋼におけるγ”(Ni₃Nb)の析出挙動
佐野佳祐, 大野直子, 鵜飼重治, 林重成, 三浦誠司, 井上利彦, 山下真一郎, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2012, 2012年

高Ni鋼におけるγ”(Ni₃Nb)の析出挙動
佐野佳祐, 大野直子, 鵜飼重治, 林重成, 三浦誠司, 井上利彦, 山下真一郎, 日本金属学会講演概要(CD-ROM), 151st, 2012年

AZ31Bマグネシウム合金集合組織材の塑性変形挙動と双晶活動のEBSD解析
三浦誠司, 軽金属, 61, 7, 372, 2011年07月30日
日本語

OS2003 Mg合金集合組織における双晶形成のその場観察とEBSD解析(OS20-1 双晶,OS-20 HCP金属の実験力学と計算力学)
三浦 誠司, 佐藤 伊都也, 毛利 哲夫, M&M材料力学カンファレンス, 2011, "OS2003, 1"-"OS2003-2", 2011年07月16日
A commercial Mg alloy, AZ31B, has been used widely. In the texture of AZ31B sheet, {101^^-2} twin is expected to form by applying an extension strain parallel to the c-axis, which is equivalent to the a-axis compression strain. In this study, an in-situ bending test of AZ31B sheet with a texture was conducted under a confocal scanning laser microscope to observe twinning by applying compression stress along a direction almost perpendicular to the c-axis of grains. In addition, EBSD techniques were used for the analysis of crystal orientation evolution during compression testing. In-situ observation revealed that the growth of twins is apparent during plastic bending deformation. EBSD analysis suggested that twinning behavior obey Schmid's law even in the polycrystal., 一般社団法人日本機械学会, 日本語

OS0309 擬似粒界としてMg単結晶に導入した双晶界面の変形双晶活動に及ぼす影響(非立方晶型金属材料の変形現象とそのモデル化,オーガナイズドセッション)
三浦 誠司, M&M材料力学カンファレンス, 2009, 592, 594, 2009年07月24日
Twinning behavior of Mg-Zn alloy single crystal is investigated. It was found that both the work-hardening rate and the number of serration in the stress strain curve of the specimen depends on the stress axis ([1010] or [1120]) by which the number of operative twi systems changes. In order to understand the effect of grain boundaries on the twinning in Mg alloys, twin boundaries are introduced to single crystal specimens as pseudo grain boundaries. Using EBSD analysis, the importance of the strain compatibility at grain boundaries for introducing twins is confirmed by examining the microstructure evolution of the specimens with pseudo grain boundaries., 一般社団法人日本機械学会, 日本語

マイクロインデンテーション法による純鉄の脱不働態‐再不働態化挙動における面方位依存性
山本隆登志, 伏見公志, 金野英隆, 三浦誠司, 材料と環境講演集, 2009, 109, 110, 2009年05月08日
日本語

純鉄の不働態化における冷間圧延の影響
山本隆登志, 伏見公志, 金野英隆, 三浦誠司, 電気化学会大会講演要旨集, 76th, 90, 2009年03月29日
日本語

Mg‐Y‐Zn 3元系合金のχ相組成域周辺における相平衡
濱谷篤志, 堀内寿晃, 大久保賢二, 三浦誠司, 北海道工業大学研究紀要, 37, 169, 175, 2009年03月24日
北海道工業大学, 日本語

純鉄の不働態化における金属組織の影響
山本隆登志, 伏見公志, 金野英隆, 三浦誠司, 化学系学協会北海道支部冬季研究発表会講演要旨集, 2009, 130, 2009年01月26日
日本語

Mg-Y-Zn ３元系合金のX相組成域周辺における相平衡
濱谷 篤志, 堀内 寿晃, 大久保 賢二, 北海道工業大学研究紀要, 37, 37, 169, 175, 2009年
北海道工業大学, 日本語

Effect on twinning of stress axis and twin interface　　　　　　　　　　　　　　　
M&M2009, OS0309, 2009年

Mg単結晶の高温変形挙動とその結晶方位およびひずみ速度依存性
三浦 博己, 塩谷 裕司, 楊 続躍, 酒井 拓, 渡辺 義見, 三浦 誠司, 大会講演概要, 112, 205, 206, 2007年04月11日
日本語

統計にみる金属間化合物材料研究の変遷と今後の新展開
三島良直, 乾晴行, 竹山雅夫, 高梨弘毅, 中谷亮一, 三浦誠司, 吉見享祐, 細田秀樹, 中野貴由, 木村好里, 安田弘行, 波多聰, まてりあ, 46, 4, 278, 283, 2007年04月01日
The Japan Institute of Metals and Materials, 日本語

第5分科(社会基盤材料) : 21世紀の社会基盤整備に向けた材料開発
三浦 誠司, 吉見 享祐, まてりあ : 日本金属学会会報, 46, 3, 215, 215, 2007年03月01日
The Japan Institute of Metals and Materials, 日本語

レーザー顕微鏡と光干渉法を組み合わせたミクロンサイズ薄膜厚さ変化測定の試み (特集 高機能材料の開発を支える分析技術,試験方法)
三浦 誠司, 岡 和彦, Polyfile, 43, 10, 30, 35, 2006年10月
大成社, 日本語

「金属間化合物Fe₃AlCとフェライト/オーステナイトとの相平衡に基づく複相鋼の組織調整と機械的性質」
三浦誠司, ふぇらむ, 11, 9, 595, 2006年09月01日
日本語

企画に当たって
三浦 誠司, 吉見 享祐, 杉山 昌章, 津崎 兼彰, まてりあ : 日本金属学会会報, 45, 2, 83, 83, 2006年02月20日
日本語

Gd系薄膜シンチレータの開発(2)~焼結による薄膜化~
土田昇平, 春名潤, 金子純一, 山口達, 須佐憲三, 三浦誠司, 奥隆之, 藤田文行, 本間彰, 沢村晃子, 古坂道弘, 清水裕彦, 鬼柳善明, 日本原子力学会春の年会要旨集(CD-ROM), 2006, 2006年

Gd系薄膜シンチレータの開発(3)~Gdパイロシリケイト粉体シンチレータの合成と評価~
山口達, 春名潤, 金子純一, 須佐憲三, 三浦誠司, 八木康洋, 川村宗範, 奥隆之, 藤田文行, 本間彰, 石橋浩之, 沢村晃子, 古坂道弘, 清水裕彦, 鬼柳善明, 日本原子力学会春の年会要旨集(CD-ROM), 2006, 2006年

共晶凝固および共析変態を組み合わせたNb-Si 系多元合金の組織制御　　　　　　　　　　　　　　　
Ｈ18年度172委員会報告書, 6, 2, 111, 118, 2006年

多元系合金状態図反応経路の幾何学的記述とそのAl-Mo-Ti 三元系状態図への適用　　　　　　　　　　　　　　　
Ｈ18年度172委員会報告書, 6, 2, 49, 58, 2006年

Mg多結晶の動的再結晶と破壊挙動
三浦 博己, 楊 続躍, 酒井 拓, 渡辺 義見, 三浦 誠司, 大会講演概要, 109, 347, 348, 2005年10月20日
日本語

融液からの金属・合金単結晶育成
三浦誠司, 実験力学, 5, 3, 291, 294, 2005年09月25日
日本実験力学会, 日本語

高い空間・時間分解能を付与した平面型破壊・亀裂発生センサのための金属酸化物系半導体に関する研究
三浦誠司, セコム科学技術振興財団研究報告集, 24, 160, 166, 2005年05月
日本語

延性金属粒子を分散させた高度マグネシウム合金の機械的特性
三浦誠司, 渡辺義見, 三浦博己, Form Tech Rev, 14, 1, 20, 24, 2005年03月10日
日本語

よくわかる実験技術 融液からの金属・合金単結晶育成
三浦 誠司, 実験力学, 5, 3, 291, 294, 2005年
日本実験力学会, 日本語

Mg単結晶の高温変形とその超塑性挙動機構の解明
三浦 博己, 楊 続躍, 酒井 拓, 能川 久史, 渡辺 義見, 三浦 誠司, 大会講演概要, 107, 61, 62, 2004年11月01日
日本語

Fe-Mn-Al-C合金におけるγ+κ二相組織の結晶方位関係と機械的性質
石井 宏明, 三浦 誠司, 毛利 哲雄, 材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 17, 6, 1363, 1363, 2004年09月01日
日本語

マグネシウム合金への動的再結晶機構の解明と強ひずみ加工へのアプローチ　　　　　　　　　　　　　　　
三浦博己, 渡辺義見, 三浦誠司, 材料科学研究助成研究成果報告, 17, 12, 17, 2004年05月
なし, 日本語, 記事・総説・解説・論説等（その他）

GSO中性子シンチレータの合成と評価
山口達, 金子純一, 三浦誠司, 須佐憲三, 奥隆之, 藤田文行, 本間彰, 古坂道弘, 清水裕彦, 日本中性子科学会年会講演概要集, 4th, 2004年

GSO中性子シンチレータ薄膜化の試み
土田昇平, 山口達, 金子純一, 須佐憲三, 三浦誠司, 奥隆之, 藤田文行, 古坂道弘, 清水裕彦, 日本中性子科学会年会講演概要集, 4th, 2004年

ステップ照らすモデル?--高温レーザー顕微鏡で見た金属表面2 (特集 第5回21世紀の境界領域研究を考えるシンポジウム)
三浦 誠司, 三浦 博己, バウンダリ-, 19, 11, 18, 20, 2003年11月
コンパス社, 日本語

延性金属粒子分散による高強度マグネシウム合金の機械的特性,特に延性改善に関する研究
三浦誠司, 天田金属加工機械技術振興財団研究概要報告書・国際交流報告書, 15, 146, 149, 2003年02月
日本語

現象論的計算によるFe-Pd基L10型規則相中のNi置換挙動の評価　　　　　　　　　　　　　　　
堀内寿晃, 五十嵐正晃, 阿部富士雄, 大久保賢二, 三浦誠司, 毛利哲雄, 日本学術振興会 合金状態図第172委員会研究報告書, 3, 57, 2003年
日本語, 記事・総説・解説・論説等（その他）

移動速度・秒速0.1ミクロン--高温顕微鏡で見た金属表面 (第4回 21世紀の境界領域研究を考えるシンポジウム(3))
三浦 誠司, バウンダリ-, 18, 12, 10, 13, 2002年12月
コンパス社, 日本語

第4回21世紀の境界領域研究を考えるシンポジウムについて
三浦 誠司, まてりあ : 日本金属学会会報, 41, 11, 814, 814, 2002年11月20日
日本語

「鉄鋼便覧 第4版」　　　　　　　　　　　　　　　
日本鉄鋼協会, 2002年

白金族金属・合金の現状と将来―新規産業の創造を目指して Rh基L1₂型金属間化合物の熱物性(熱膨張係数,熱伝導率)と機械的性質
三浦誠司, 寺田芳弘, 毛利哲雄, まてりあ, 40, 3, 224, 228, 2001年03月20日
The Japan Institute of Metals and Materials, 日本語

Alloy Design of Nb_5_Si_3_ Composite with a Fine Lamellar Structure for Ultra-High Temperature Application　　　　　　　　　　　　　　　
Nobuaki Sekido, Fu-Gao Wei, Yoshisato Kimura, Seiji Miura, Yoshinao Mishima, Proc. of Intl. Symp. on Structural Intermetallics, Structural Intermetallics 2001, 795, 800, 2001年

金属間化合物合金の組織制御--多元素系状態図に基づく共析分解による (第2回「21世紀の境界領域研究を考えるシンポジウム」)
三浦 誠司, バウンダリ-, 16, 9, 34, 36, 2000年09月
コンパス社, 日本語

Ir,Rh基Ll2金属間化合物 熱膨張係数,熱伝導率 (特集 白金族金属の可能性)
三浦 誠司, 寺田 芳弘, 毛利 哲雄, バウンダリ-, 16, 5, 7, 11, 2000年05月
コンパス社, 日本語

Ir, Rh基L12金属間化合物の熱的性質（熱膨張係数、熱伝導率）　　　　　　　　　　　　　　　
三浦誠司, 寺田芳弘, 毛利哲雄, 金属学会分科会シンポジウム「白金族金属・合金の現状と将来」テキスト, 21, 2000年
日本語, 記事・総説・解説・論説等（その他）

Ir, Rh基L12金属間化合物、熱膨張係数、熱伝導率　　　　　　　　　　　　　　　
三浦誠司, 寺田芳弘, 毛利哲雄, BOUNDARY, 16, 7, 2000年
日本語, 記事・総説・解説・論説等（その他）

「半導体・金属材料用語辞典」<高橋清、新居和嘉 監修>　　　　　　　　　　　　　　　
（株）工業調査会, 1999年

電気炉の地震対策 : 停電復旧時の火災対策の観点から
三浦 誠司, まてりあ : 日本金属学会会報, 37, 10, 890, 890, 1998年10月20日
日本語

単結晶Cu₃Pt合金の低温強化と強度の温度依存性
三井和博, 三浦誠司, 三島良直, 神奈川工科大学研究報告 B 理工学編, 22, 223, 230, 1998年03月
神奈川工科大学, 日本語

単結晶Cu3Pt合金の低温強化と強度と正の温度依存性
三井 和博, 三浦 誠司, 三島 良直, 神奈川工科大学研究報告 B 理工学編, 22, 223, 230, 1998年03月
材料工学, 笹氣出版印刷株式会社, 日本語

Ni-Al系金属間化合物の反応焼結過程の検討
三浦 誠司, 三島 良直, まてりあ : 日本金属学会会報, 35, 6, 632, 636, 1996年06月20日
日本金属学会, 日本語

燃焼合成法による金属間化合物の製造 Ni‐Al系金属間化合物の反応焼結過程の検討
三浦誠司, 三島良直, まてりあ, 35, 6, 632, 636, 1996年06月
The Japan Institute of Metals and Materials, 日本語

状態図の横軸を変えたら
三浦 誠司, まてりあ : 日本金属学会会報, 34, 9, 1112, 1112, 1995年09月20日
日本語

Microstructural control for ductilization of multi-phase alloys based on B2 CoAl
Yoshinao Mishima, Seiji Miura, Yoshisato Kimura, Materials Science and Engineering A, 192-193, 2, 748, 755, 1995年02月28日
Tensile tests were carried out on several alloys based on the B2 intermetallic compound CoAl. The alloys are multi-phase with Co primary solid solution, L12(Co,Ni)3Al, or E21Co3AlC
they were developed by the present authors and showed some room temperature ductility previously under compression testing. Also, attempts to refine the microstructure of the selected alloys were made using heat treatment and hot or cold rolling. Although no drastic improvement in room temperature ductility is observed, indications of a microstructure favorable for improved ductility are obtained. Also, it is found that some type of solidification defect causes premature failure during tensile tests, but not during compression tests, for which a cure should be sought after further improvement in the mechanical properties. © 1995., 英語

Microstructure and Mechanical Properties of the L1_2_/L2_1_Two-phase Alloys in the Quaternary Co-Al-Ni-Ti System　　　　　　　　　　　　　　　
Takeo Matano, Yoshisato Kimura, Seiji Miura, Yoshinao Mishima, MRS Symp. Proc. High-Temperature Ordered Intermetallic Alloys VI Mater. Res. Soc., 364, 1377, 1382, 1995年

特集 SFの材料学的検証 SFと現実の材料の加工,強度,融点,密度
細田秀樹, 三浦誠司, バウンダリー, 10, 8, 8, 9, 1994年08月
日本語

特集 SFの材料学的検証 SFで材料は冷遇されている!
三浦誠司, 細田秀樹, バウンダリー, 10, 8, 5, 7, 1994年08月
日本語

Ll₂型金属間化合物Ni₃(Al,Si)単結晶の高温における塑性変形挙動
三島良直, 三浦誠司, 岩谷直治記念財団研究報告書, 16, 72, 76, 1993年08月
日本語

4B亜族元素Siを添加したNi3Al単結晶の変形挙動
三浦 誠司, 三島 良直, 鈴木 朝夫, 日本金属学会誌, 56, 10, p1200, 1206, 1992年10月
日本金属学会, 日本語

ハンマーアンビル法により液体超急冷したTiAlの微視組織とCr添加の影響
小林郁夫, 三浦誠司, 三島良直, 鈴木朝夫, 材料とプロセス, 4, 2, 731, 1991年03月
日本語

高温におけるNi3(Al,X)単結晶の塑性変形挙動 (金属間化合物--新しい構造用材料としての展開<特集>)
三島 良直, 三浦 誠司, 鈴木 朝夫, 日本金属学会会報, 30, 1, p6, 11, 1991年01月
日本金属学会, 日本語

図でよくわかる 機械材料学
渡辺義見, 三浦博己, 三浦誠司, 渡邊千尋
コロナ社, 2010年02月01日, 4339046051, 232, ［共著］

図でよくわかる機械材料学　　　　　　　　　　　　　　　
コロナ社, 2010年

実験力学ハンドブック　　　　　　　　　　　　　　　
日本実験力学会, 2008年

よく分かる実験技術・学術用語　　　　　　　　　　　　　　　
日本実験力学会, 2006年

顕微インデンテーション法の開発と観察結果　　　　　　　　　　　　　　　
三浦 誠司, 峯田 才寛, 岡 和彦, 宮島 達也
日本熱処理講演大会, 2017年12月01日, 日本語, 口頭発表（一般）
東北大, ［国内会議］

改良型顕微インデンテーション法によるMg単結晶及び多結晶における変形挙動のその場観察　　　　　　　　　　　　　　　
峯田才寛, 三浦誠司, 岡 和彦, 宮島達也, 佐藤裕之
M&M2017材料力学カンファレンス, 2017年10月07日, 日本語, 口頭発表（一般）
北海道大学, ［国内会議］

Prediction of formation enthalpies using machine learning techniques for C14-Laves phase　　　　　　　　　　　　　　　
S.Minamoto, T. Horiuchi, S. Miura
Intermetallics2017, 2017年10月03日, 英語, 口頭発表（一般）
［国内会議］

Microstructure evolution and mechanical properties of a multi-phase alloy in the Cr-Mo-Nb system　　　　　　　　　　　　　　　
Li Peng, Ken-ichi Ikeda, Seiji Miura, Toshiaki Horiuch
Intermetallics2017, 2017年10月03日, 英語, ポスター発表
［国際会議］

Effect of Pd-site substitutional elements on phase stability and mechanical property of B2 compound PdAl　　　　　　　　　　　　　　　
Tomonori SOMA, Seiji MIURA
Intermetallics2017, 2017年10月03日, 英語, ポスター発表
［国際会議］

Alloy design concept for bcc-T2 silicide-B2 aluminide multi-component alloys in conjunction with Laves phase　　　　　　　　　　　　　　　
Seiji MIURA, Takuya YAMANOUCHI, Satoshi TAKIZAWA, Ken-ichi IKEDA, Toshiaki HORIUCHI
Intermetallics2017, 2017年10月03日, 英語, 口頭発表（一般）
KlosterBanz, Germany, ［国際会議］

Microstructure evolution of a three-phase alloy in Cr-Mo-Nb system　　　　　　　　　　　　　　　
三浦 誠司
高温変形の組織ダイナミクス研究会 「平成 29 年度 夏の学校」, 2017年09月19日, 英語, 口頭発表（一般）
愛知県蒲郡市 サンヒルズ三河湾, ［国内会議］

PdAl-B2化合物の相安定性及び機械的性質に及ぼすPd-site置換元素の影響　　　　　　　　　　　　　　　
相馬智紀, 三浦 誠司
高温変形の組織ダイナミクス研究会 「平成 29 年度 夏の学校」, 2017年09月19日, 日本語, 口頭発表（一般）
愛知県蒲郡市 サンヒルズ三河湾, ［国内会議］

高強度シリサイド相および高耐酸化性アルミナイド相の導入を目指した耐火金属基bcc固溶体合金の組成設計　　　　　　　　　　　　　　　
三浦 誠司
高温変形の組織ダイナミクス研究会 「平成 29 年度 夏の学校」, 2017年09月19日, 日本語, 口頭発表（基調）
愛知県蒲郡市 サンヒルズ三河湾, ［国内会議］

Mg-RE (RE=Y、Dy、Gd)合金多結晶における{11-21}双晶の活動性　　　　　　　　　　　　　　　
峯田 才寛, 佐藤 裕之, 三浦 誠司
日本金属学会秋期大会, 2017年09月06日, 日本語, 口頭発表（一般）
［国内会議］

Mg-Al-Y合金に生成する長周期相の組織観察2　　　　　　　　　　　　　　　
田畑 柚紀子, 藤井 智之, 糸井 貴臣, 堀内 寿晃, 三浦 誠司
日本金属学会秋期大会, 2017年09月06日, 日本語, 口頭発表（一般）
［国内会議］

Al-Mg-Si系合金における微細組織と機械的性質の関係　　　　　　　　　　　　　　　
佐藤翔悟, 池田賢一, 三浦誠司, 高田健
日本金属学会秋期大会, 2017年09月06日, 日本語, 口頭発表（一般）
［国内会議］

Laves相化合物 NbCr2 と NbNiAl の電子論計算　　　　　　　　　　　　　　　
滝沢 聡, 三浦 誠司
日本金属学会秋期大会, 2017年09月06日, 日本語, 口頭発表（一般）
［国内会議］

B2-PdAl化合物の相安定性に及ぼすPd-site置換元素の影響　　　　　　　　　　　　　　　
相馬 智紀, 三浦 誠司
日本金属学会秋期大会, 2017年09月06日, 日本語, 口頭発表（一般）
北海道大学, ［国内会議］

高エントロピー合金の緩慢拡散に及ぼす格子歪の影響の解析　　　　　　　　　　　　　　　
安本尚人, 瀧澤聡, 三浦誠司
日本金属学会日本鉄鋼協会両北海道支部サマーセッション, 2017年07月14日, 日本語, ポスター発表
［国内会議］

Mg-Li-Zn-Y系合金におけるLPSO相の析出挙動　　　　　　　　　　　　　　　
森山弘啓, 三浦誠司, 池田賢一
日本金属学会日本鉄鋼協会両北海道支部サマーセッション, 2017年07月14日, 日本語, ポスター発表
室蘭工業大学, ［国内会議］

Al-0.62mass%Mg-0.32mass%Si 合金の時効硬化に及ぼす予ひずみの影響　　　　　　　　　　　　　　　
池田賢一, 佐藤翔悟, 三浦誠司, 高田健
日本顕微鏡学会, 2017年05月30日, 日本語, 口頭発表（一般）
札幌, ［国内会議］

bcc基Nb-Mo固溶体への遷移金属添加の電子論計算　　　　　　　　　　　　　　　
滝沢 聡, 三浦 誠司
日本金属学会春期大会, 2017年03月, 日本語, 口頭発表（一般）
［国内会議］

Mg-Y 合金単結晶及び多結晶を用いた{11-21}双晶の活動性評価　　　　　　　　　　　　　　　
峯田才寛, 三浦誠司
日本金属学会春期大会, 2017年03月, 日本語, 口頭発表（一般）
［国内会議］

In-situインデンテーションの開発と観察　　　　　　　　　　　　　　　
峯田才寛, 三浦誠司, 岡和彦, 宮島達也
日本金属学会春期大会, 2017年03月, 日本語, 口頭発表（一般）
［国内会議］

Study on the mechanical properties of a multi-component Cr50Mo30Nb20 alloy　　　　　　　　　　　　　　　
Li Peng, Ken-ichi Ikeda, Seiji Miura, Toshiaki Horiuchi
日本金属学会春期大会, 2017年03月, 英語, 口頭発表（一般）
［国内会議］

Mg-Al-Y合金に生成する長周期相の組織観察　　　　　　　　　　　　　　　
田畑 柚紀子, 瀬尾 篤, 糸井 貴臣, 堀内 寿晃, 三浦 誠司
日本金属学会春期大会, 2017年03月, 日本語, 口頭発表（一般）
首都大学東京, ［国内会議］

Comparison with the composition dependence of the LPSO poly-types formed in Mg-M-Y (M=Ni, Cu and Zn) ternary alloy systems　　　　　　　　　　　　　　　
Takaomi Itoi, Takuya Ogaku, Atsushi Seo, Toshiaki Horiuchi, Seiji Miura
LPSO2016, 2016年12月05日, 英語, 口頭発表（一般）
［国際会議］

Investigation of substitutional behavior of rare-earth elements in LPSO phases　　　　　　　　　　　　　　　
Seiji Miura, Futoshi Miyakawa, Ken-ichi Ikeda, Toshiaki Horiuchi, Takaomi Itoi, Satoshi Minamoto
LPSO2016, 2016年12月05日, 英語, 口頭発表（一般）
Kyoto, ［国際会議］

The evaluation of the composition dependence of fracture toughness of Al3Nb alloys evaluated by using micro-size fracture testing　　　　　　　　　　　　　　　
Nobuhiro Matsuzaki, Ken-ichi Ikeda, Seiji Miura, Nobuaki Sekido, Takahito Ohmura
MRS Symp., 2016年11月29日, 英語, ポスター発表
［国際会議］

cc / B2 phase equilibria and phase transformation from B2 to β’ in refractory Nb-X(Pd, Rh, Ir)-Al alloys　　　　　　　　　　　　　　　
Takuya Yamanouchi, Seiji Miura, Munekazu Ohno, Ken-ichi Ikeda
MRS Symp., 2016年11月29日, 英語, 口頭発表（一般）
［国際会議］

In-situ and ex-situ indentation examinations on alpha -Nb5Si3　　　　　　　　　　　　　　　
三浦 誠司
MRS Symp., 2016年11月29日, 英語, ポスター発表
ボストン, ［国際会議］

冷間圧延を施したAl-Mg-Si合金の時効硬化挙動　　　　　　　　　　　　　　　
池田賢一, 佐藤翔悟, 三浦誠司, 高田健
軽金属学会第131回秋期大会, 2016年11月05日, 日本語, 口頭発表（一般）
茨城大学水戸キャンパス, ［国内会議］

Microstructure control of Nb-Si alloys for improving properties　　　　　　　　　　　　　　　
三浦 誠司
KIM-JIM シンポジウム, 2016年10月27日, 英語, 口頭発表（招待・特別）
韓国釜山、BEXCO, ［招待講演］, ［国際会議］

Phase stability and microstructure control of Nb-Cr-Mo ternary system -from bcc single-phase region to bcc-bcc-Laves three-phase region　　　　　　　　　　　　　　　
三浦 誠司
第97回マテリアルセミナー, 2016年10月13日, 北海道大学 大学院工学研究院 材料科学部門, 英語, 公開講演，セミナー，チュートリアル，講習，講義等
北海道大学 大学院工学研究院, ［国内会議］

Al-Mg-Si系合金の時効硬化挙動に及ぼす冷間加工の影響　　　　　　　　　　　　　　　
佐藤 翔悟, 池田 賢一, 三浦 誠司
日本金属学会秋期大会, 2016年09月21日, 日本語, ポスター発表
［国内会議］

耐火金属基高濃度固溶体合金の機械的特性の調査　　　　　　　　　　　　　　　
松崎 伸孔, 三浦 誠司
日本金属学会秋期大会, 2016年09月21日, 日本語, 口頭発表（一般）
［国内会議］

Mg-Zn-Gd系へのRE添加によるType-2 LPSO相からType-1 LPSO相への遷移　　　　　　　　　　　　　　　
宮川 太志, 三浦 誠司, 池田 賢一
日本金属学会秋期大会, 2016年09月21日, 日本語, 口頭発表（一般）
［国内会議］

Study on the microstructure and mechanical properties of bcc-bcc-Laves three-phase alloys in Nb-Cr-Mo system　　　　　　　　　　　　　　　
彭 力, 池田 賢一, 三浦 誠司, 堀内 寿晃
日本金属学会秋期大会, 2016年09月21日, 英語, 口頭発表（一般）
［国内会議］

Nb-Ni-Al系合金におけるLaves相の相安定性に対するCr、V添加の影響　　　　　　　　　　　　　　　
山野内 拓也, 三浦 誠司, 堀内 寿晃
日本金属学会秋期大会, 2016年09月21日, 日本語, 口頭発表（一般）
［国内会議］

In-situ BrinellインデンテーションによるPure Mg単結晶及び多結晶の変形挙動観察　　　　　　　　　　　　　　　
峯田 才寛, 三浦 誠司
日本金属学会秋期大会, 2016年09月21日, 日本語, 口頭発表（一般）
［国内会議］

第一原理電子論計算によるbcc基多元合金の原子間相互作用の検討　　　　　　　　　　　　　　　
滝沢 聡, 三浦 誠司
日本金属学会秋期大会, 2016年09月21日, 日本語, 口頭発表（一般）
［国際会議］

Mg-M-Y (M=Ni,Cu,Zn) 合金に生成するLPSO相の生成範囲と構造多形の比較　　　　　　　　　　　　　　　
瀬尾 篤, 糸井貴臣, 堀内寿晃, 三浦誠司
日本金属学会秋期大会, 2016年09月21日, 日本語, 口頭発表（一般）
大阪大学豊中キャンパス, ［国内会議］

Factors controlling pseudoelasticity of Mg alloys　　　　　　　　　　　　　　　
Takahiro Mineta, Seiji Miura, Ken-ichi Ikeda
The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9), 2016年08月03日, 英語, ポスター発表
［国際会議］

The isothermal sections of Mg-Zn-Gd ternary system in the vicinity of LPSO phase　　　　　　　　　　　　　　　
Futoshi Miyakawa, Seiji Miura, Ken-ichi Ikeda
The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9), 2016年08月03日, 英語, ポスター発表
［国内会議］

Fracture toughness of Al3Nb evaluated by micro-size fracture testing　　　　　　　　　　　　　　　
Nobuhiro Matsuzaki, Seiji Miura
The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9), 2016年08月03日, 英語, ポスター発表
［国際会議］

Phase equilibrium between bcc solid solution matrix, B2 aluminides and Laves phase in Nb-based alloy　　　　　　　　　　　　　　　
Takuya Yamanouchi, Seiji Miura
The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9), 2016年08月03日, 英語, ポスター発表
Kyoto, ［国際会議］

Alloy design concept for BCC-T2 silicide-B2 aluminide multicomponent alloys　　　　　　　　　　　　　　　
Seiji Miura, Takuya Yamanouchi, Nobuhiro Matsuzaki, Tomonori Soma, Ken-ichi Ikeda
Beyond the Ni-based super alloys, 2016年07月20日, 英語, 口頭発表（一般）
Cambridge, England, ［国際会議］

Al-Mg-Si系合金の時効硬化挙動に及ぼす冷間加工の影響　　　　　　　　　　　　　　　
佐藤翔悟, 池田賢一, 三浦誠司
日本金属学会日本鉄鋼協会両北海道支部サマーセッション, 2016年07月01日, 日本語, ポスター発表
［国内会議］

Co-Nb 2元系合金の相変態挙動の高温EBSD測定によるその場観察　　　　　　　　　　　　　　　
新保右京, 阿部滉平, 堀内寿晃, 遠堂敬史, 池田賢一, 三浦誠司
日本金属学会日本鉄鋼協会両北海道支部サマーセッション, 2016年07月01日, 日本語, ポスター発表
［国内会議］

PdAlの相変態に及ぼす添加元素の影響　　　　　　　　　　　　　　　
相馬智紀, 三浦誠司
本金属学会日本鉄鋼協会両北海道支部サマーセッション, 2016年07月01日, 日本語, ポスター発表
札幌, ［国内会議］

Mg-TM-Y(TM=Cu,Ni)合金に生成するLPSO 相の構造多形　　　　　　　　　　　　　　　
瀬尾 篤, 大角 拓也, 糸井 貴臣, 堀内 寿晃, 三浦 誠司
軽金属学会第130回春期大会, 2016年05月28日, 日本語, 口頭発表（一般）
［国内会議］

Mg-Zn-Y系合金一方向凝固材の薄片4点曲げ試験による塑性変形挙動の評価　　　　　　　　　　　　　　　
池田賢一, 西尾理恵, 高紅叶, 中島英治, 三浦誠司
軽金属学会第130回春期大会, 2016年05月28日, 日本語, 口頭発表（一般）
大阪大学吹田キャンパス, ［国内会議］

異種金属多層めっき膜の作製とその物性評価　　　　　　　　　　　　　　　
坂入正敏, 三浦誠司, 永田晋二
電気化学会第83回大会, 2016年03月29日, 日本語, 口頭発表（一般）
大阪大学, ［国内会議］

Mg-Cu-Y合金に生成するLPSO相の構造多形と組成との相関　　　　　　　　　　　　　　　
瀬尾 篤, 大角 拓也, 糸井 貴臣, 堀内 寿晃, 三浦 誠司
日本金属学会春期大会, 2016年03月25日, 日本語, 口頭発表（一般）
［国内会議］

高エントロピー合金における原子拡散の kinetic Monte Carlo シミュレーション　　　　　　　　　　　　　　　
滝沢 聡, 加藤 央祐, 三浦 誠司
日本金属学会春期大会, 2016年03月25日, 日本語, 口頭発表（一般）
東京理科大学葛飾キャンパス, ［国内会議］

Mg-(Y、Dy、Gd、Zn、Al)固溶体合金における擬弾性挙動に対する底面すべり及び引張双晶のCRSSからの考察　　　　　　　　　　　　　　　
峯田 才寛, 三浦 誠司, 池田 賢一
日本金属学会春期大会, 2016年03月24日, 日本語, 口頭発表（一般）
［国内会議］

Nb基合金におけるbcc固溶体-B2アルミナイド-Laves相間の相平衡　　　　　　　　　　　　　　　
山野内 拓也, 三浦 誠司
日本金属学会春期大会, 2016年03月24日, 日本語, 口頭発表（一般）
［国内会議］

マグネシウム合金単結晶の変形挙動の諸様相におよぼす添加元素の影響　　　　　　　　　　　　　　　
三浦 誠司
日本鉄鋼協会・日本金属学会東海支部特別講演会, 2016年03月10日, 日本語, 口頭発表（招待・特別）
名古屋大学 VBLベンチャービジネスラボラトリー, ［国内会議］

Investigation on Plastic Deformability of Mg-Y Alloys by Vickers and Newly Designed In-situ Brinell Indentation Methods　　　　　　　　　　　　　　　
T. Mineta, S. Miura, K. Ikeda
2016 TMS Annual Meeting & Exhibition, 2016年02月, 英語, ポスター発表
［国際会議］

次世代火力発電に向けた高融点金属基高強度材料研究　　　　　　　　　　　　　　　
三浦 誠司
第５回エネルギー・マテリアル融合領域シンポジウム「次世代火力発電の実用化に向けた材料開発」, 2016年01月12日, 日本語, 口頭発表（招待・特別）
北海道大学工学部フロンティア応用科学研究棟鈴木章ホール, ［招待講演］, ［国内会議］

Kinetic Monte Carl法を用いた高エントロピー合金における拡散挙動の調査　　　　　　　　　　　　　　　
加藤央祐, 滝澤聡, 三浦誠司
日本金属学会日本鉄鋼協会北海道支部講演大会, 2015年12月16日, 日本語, 口頭発表（一般）
札幌, ［国内会議］

Mg合金単結晶を用いたCRSS定量化と成形性評価　　　　　　　　　　　　　　　
峯田才寛, 三浦誠司, 池田賢一
軽金属学会北海道支部若手研究交流会, 2015年11月12日, 日本語, 口頭発表（一般）
北海道立総合研究機構工業試験場, ［国内会議］

Thermal stability of Mg-Y-Zn LPSO phases and revised thermodynamic description of the Mg-Y-Zn phase diagram　　　　　　　　　　　　　　　
Rainer Schmid-Fetzer, Joachim Groebner, Michiaki Yamasaki, Yoshihito Kawamura, Hiroshi Okuda, Seiji Miura, Toshiaki Horiuchi, Jian-Feng Nie
Mg2015, 2015年10月, 英語, 口頭発表（招待・特別）
Jeju, Korea, ［招待講演］, ［国際会議］

The phase equilibrium in the vicinity of LPSO phase in Mg-Zn-Gd ternary system　　　　　　　　　　　　　　　
Futoshi Miyakawa, Ken-ichi Ikeda, Seiji Miura, Toshiaki Horiuchi, Satoshi Minamoto
Mg2015, 2015年10月, 英語, ポスター発表
Jeju, Korea, ［国際会議］

Deformation behavior of LPSO phase in Mg-Zn-Y alloy by four-point bending test using a thin sheet　　　　　　　　　　　　　　　
K. Ikeda, R. Nishio, H. Gao, S. Hata, H. Nakashima, S. Miura
Mg2015, 2015年10月, 英語, 口頭発表（一般）
Jeju, Korea, ［国内会議］

Application of Chevron-Notched Micro-Size Fracture Testing Method on Single Crystal Si and Nb-Si intermetallic compound　　　　　　　　　　　　　　　
三浦 誠司
Intermetallics 2015, 2015年09月30日, 英語, 口頭発表（一般）
Kloster Banz, Germany, ［国際会議］

AuTi-FeTi拡散対における逆マルテンサイト変態の観察　　　　　　　　　　　　　　　
青木 拓, 田原 正樹, 稲邑 朋也, 細田 秀樹, 後藤 研滋, 金高 弘恭, 御手洗 容子, 三浦 誠司
日本金属学会秋期大会, 2015年09月, 日本語, 口頭発表（一般）
九州大学, ［国内会議］

Mg-Ni-Y合金に生成するLPSO相の構造多形と組成との相関2　　　　　　　　　　　　　　　
大角 拓也, 瀬尾 篤, 糸井 貴臣, 堀内 寿晃, 三浦 誠司
日本金属学会秋期大会, 2015年09月, 日本語, 口頭発表（一般）
［国内会議］

reverse nonequilibrium molecular dynamics による過冷却液体の粘性の計算とガラス転移　　　　　　　　　　　　　　　
滝沢 聡, 内山 友裕, 三浦 誠司, 毛利 哲雄
日本金属学会秋期大会, 2015年09月, 日本語, 口頭発表（一般）
九州大学, ［国内会議］

純Mg単結晶における{10-12}双晶導入に伴う表面起伏発生　　　　　　　　　　　　　　　
山口 修平, 三浦 誠司, 池田 賢一
日本金属学会秋期大会, 2015年09月, 日本語, 口頭発表（一般）
九州大学, ［国内会議］

(Nb,Mo)-bccss / (Nb,Mo)5(Si,B)3-T2 / (Ni,Pd)Al-B2三相平衡関係の調査　　　　　　　　　　　　　　　
山野内拓也, 三浦誠司
日本金属学会秋期大会, 2015年09月, 日本語, 口頭発表（一般）
九州大学, ［国内会議］

Mg 合金における Detwinning によるひずみ回復効果の温度及び組成依存性　　　　　　　　　　　　　　　
峯田才寛, 三浦誠司, 池田賢一
日本金属学会秋期大会, 2015年09月, 日本語, 口頭発表（一般）
九州大学, ［国内会議］

シンクロ型LPSO相を有する結晶性材料の薄片4点曲げ試験による変形挙動評価　　　　　　　　　　　　　　　
池田賢一, 西尾理恵, 高 紅叶, 波多 聰, 中島英治, 三浦誠司
日本金属学会秋期大会, 2015年09月, 日本語, 口頭発表（一般）
九州大学, ［国内会議］

Mg-Zn-Gd三元系におけるLPSO相の形成過程の調査　　　　　　　　　　　　　　　
宮川太志, 三浦誠司, 池田賢一
日本金属学会日本鉄鋼協会両北海道支部サマーセッション, 2015年07月17日, 日本語, ポスター発表
室蘭工大, ［国内会議］

Nb基高濃度BCC固溶体の機械的特性　　　　　　　　　　　　　　　
松崎伸孔, 三浦誠司
日本金属学会日本鉄鋼協会両北海道支部サマーセッション, 2015年07月17日, 日本語, ポスター発表
室蘭工大, ［国内会議］

The influence of phase composition to melting temperature of (Nb,Mo) - (Ni,Pd)Al two phase alloys　　　　　　　　　　　　　　　
Takuya Yamanouchi, Seiji Miura
The 1st International conference on advanced High-Temperature Materials Technology for sustainable and Reliable Power Engineering (123HiMAT2015), 2015年07月01日, 英語, ポスター発表
札幌, ［国際会議］

薄片4点曲げ試験を用いたMg-Zn-Y系合金の変形挙動の評価　　　　　　　　　　　　　　　
田賢一, 西尾理恵, 高紅叶, 波多聰, 中島英治, 三浦誠司
軽金属学会第128回春期大会, 2015年05月16日, 日本語, 口頭発表（一般）
［国内会議］

粒界エネルギーの異方性を考慮した粒成長過程の再現　　　　　　　　　　　　　　　
出井 寛大, 滝沢 聡, 池田 賢一, 三浦 誠司
日本金属学会春期講演大会, 2015年03月18日, 日本語, 口頭発表（一般）
［国内会議］

マイクロサイズ破壊試験法によるNb/Nb5Si3界面の破壊挙動の調査　　　　　　　　　　　　　　　
鈴木 詩織, 関戸 信彰, 大村 孝仁, 三浦 誠司
日本金属学会春期講演大会, 2015年03月18日, 日本語, 口頭発表（一般）
［国内会議］

(Nb,Mo)-(Ni,Pd)Al二相合金の共晶点温度に及ぼす相組成の影響　　　　　　　　　　　　　　　
山野内 拓也, 三浦 誠司
日本金属学会春期講演大会, 2015年03月18日, 日本語, 口頭発表（一般）
［国内会議］

Mg 合金単結晶上の圧痕形状に基づく塑性変形異方性に対する Y 添加の影響　　　　　　　　　　　　　　　
峯田才寛, 三浦誠司, 池田賢一
日本金属学会春期講演大会, 2015年03月18日, 日本語, 口頭発表（一般）
［国内会議］

Mg-Ni-Y合金に生成するLPSO相の構造多形と組成との相関　　　　　　　　　　　　　　　
大角 拓也, 増井 亮介, 糸井 貴臣, 堀内 寿晃, 三浦 誠司
日本金属学会春期講演大会, 2015年03月18日, 日本語, 口頭発表（一般）
［国内会議］

薄片4点曲げ試験によるLPSO相の変形挙動評価　　　　　　　　　　　　　　　
池田賢一, 西尾理恵, 高紅叶, 中島英治, 三浦誠司
シンクロ型LPSO構造の材料科学、平成26年度研究成果報告会, 2015年03月05日, 日本語, 口頭発表（一般）
軽井沢, ［国内会議］

Mg-Zn-Y、Mg-Zn-GdおよびMg-Al-GdのLPSO相近傍の相構成の比較　　　　　　　　　　　　　　　
三浦誠司, 池田賢一, 堀内寿晃, 源 聡
シンクロ型LPSO構造の材料科学、平成26年度研究成果報告会, 2015年03月05日, 日本語, 口頭発表（一般）
軽井沢, ［国内会議］

熱拡散の熱力学および統計力学的解析　　　　　　　　　　　　　　　
小林世納, 滝澤聡, 三浦誠司
日本金属学会日本鉄鋼協会北海道支部講演大会, 2015年01月29日, 日本語, 口頭発表（一般）
［国内会議］

マイクロサイズ破壊試験法の確立およびNb/αNb5Si3界面の破壊挙動調査への応用　　　　　　　　　　　　　　　
鈴木詩織, 関戸 信彰, 大村 孝仁, 三浦 誠司
第2回グリーンエネルギー材料のマルチスケール創製研究会, 2015年01月11日, 日本語, 口頭発表（一般）
松江, ［国内会議］

Evaluation of fracture toughness of alpha-Nb5Si3 by micro-sized cantilever beam test　　　　　　　　　　　　　　　
Shiori Suzuki, Nobuaki Sekido, Takahito Ohmura, Seiji Miura
MRS Symp., 2014年12月01日, 英語, ポスター発表
ボストン, ［国際会議］

Phase equilibrium between bcc solid solution matrix and B2 aluminides in Nb-based alloy　　　　　　　　　　　　　　　
Takuya Yamanouchi, Seiji Miura
MRS Symp., 2014年12月01日, 英語, ポスター発表
ボストン, ［国際会議］

Evaluation of Critical Resolved Shear Stresses for various plastic deformation mechanisms to understand mechanical properties of magnesium – yttrium alloys　　　　　　　　　　　　　　　
T. Mineta, S. Miura
MRS Symp., 2014年12月01日, 英語, 口頭発表（一般）
ボストン, ［国際会議］

Mg-Zn-Y系およびMg-Al-Gd系のMg-rich領域における相平衡の比較　　　　　　　　　　　　　　　
三浦誠司, 堀内寿晃, 源 聡
合金状態図第172委員会, 2014年10月28日, 日本語, 口頭発表（一般）
名古屋大学, ［国内会議］

Comparison of the phase equilibrium in the vicinity of LPSO phases in Mg-Zn-Y and Mg-Al-Gd ternary systems　　　　　　　　　　　　　　　
Seiji Miura, Toshiaki Horiuchi, Satoshi Minamoto
LPSO2014, 2014年10月06日, 英語, ポスター発表
熊本, ［国際会議］

An application of CVM to Phase Field Microstructure Image analysis　　　　　　　　　　　　　　　
K. Iseya, K. Mimura, S. Miura, T. Mohri
TOFA 2014, 2014年09月07日, 英語, 口頭発表（一般）
Brno, Czech, ［国際会議］

分子動力学法による原子スケールのき裂形成・消滅挙動の温度依存性の解析　　　　　　　　　　　　　　　
今井克弥, 滝沢聡, 三浦誠司
本金属学会秋期大会, 2014年09月, 日本語, 口頭発表（一般）
名古屋大学, ［国内会議］

マイクロサイズ破壊試験法によるNb5Si3の破壊靭性値評価　　　　　　　　　　　　　　　
鈴木 詩織, 三浦, 誠司, 大村 孝仁, 関戸 信彰
日本金属学会秋期大会, 2014年09月, 日本語, 口頭発表（一般）
名古屋大学, ［国内会議］

Nb基合金における母相bcc固溶体とB2アルミナイドの間の相平衡　　　　　　　　　　　　　　　
山野内拓也, 三浦誠司
日本金属学会秋期大会, 2014年09月, 日本語, 口頭発表（一般）
名古屋大学, ［国内会議］

Mg-Y 合金延性改善効果に対する CRSS 比からの考察　　　　　　　　　　　　　　　
峯田才寛, 三浦誠司, 岡 和彦, 宮島達也
日本金属学会秋期大会, 2014年09月, 日本語, 口頭発表（一般）
名古屋大学, ［国内会議］

マグネシウム合金単結晶の変形挙動におよぼすY添加の影響　　　　　　　　　　　　　　　
三浦 誠司
高性能Mg合金創成加工研究会, 2014年08月25日, 日本語, 口頭発表（招待・特別）
熊本大学, ［招待講演］, ［国内会議］

分子動力学法を用いた微細な欠陥を有するMgの双晶発生機構の解析　　　　　　　　　　　　　　　
今井克弥, 滝澤聡, 三浦 誠司
高温変形 夏の学校, 2014年08月21日, 日本語, 口頭発表（一般）
屈斜路研修センター（北見工大）, ［国内会議］

マイクロサイズ破壊試験法による多結晶αNb5Si3からの単結晶破壊靱性値評価　　　　　　　　　　　　　　　
鈴木 詩織, 三浦 誠司
高温変形 夏の学校, 2014年08月21日, 日本語, 口頭発表（一般）
屈斜路研修センター（北見工大）, ［国内会議］

Phase Equilibrium and phase transformation in Nb-Si based alloys with ternary and quaternary additives　　　　　　　　　　　　　　　
Seiji Miura, Tatsuichi Tanahashi, Toru Hatabata
International Workshop on Advanced High-Temperature Materials, 2014年08月, 英語, 口頭発表（一般）
［国際会議］

Phase Field法による凝固・粒成長過程の再現　　　　　　　　　　　　　　　
出井寛大, 滝沢 聡, 三浦誠司
日本金属学会日本鉄鋼協会北海道支部講演大会, 2014年07月28日, 日本語, ポスター発表
［国内会議］

EPMA 多点分析による相平衡関係確立とMg 系への適用　　　　　　　　　　　　　　　
三浦 誠司, 堀内寿晃
学振172委員会研究会, 2014年05月22日, 日本語, 口頭発表（一般）
［国内会議］

Cu‐Niナノ多層めっき薄膜の作製とその物性評価
坂入正敏, 三浦誠司, 大久保賢二, 永田晋二
電気化学会大会講演要旨集, 2014年03月29日, 日本語

相平衡解明のための微量元素の空間分布把握の必要性と同位体顕微鏡－Mg合金およびNb合金を例として　　　　　　　　　　　　　　　
三浦 誠司
第5回 安定同位元素イメージング技術による産業イノベーション シンポジウム, 2014年03月24日, 北海道大学 創成研究機構 産業利用拡大支援室, 日本語, 口頭発表（招待・特別）
札幌, ［国内会議］

軸圧縮によるMg‐Y単結晶{1122}〈1123〉二次錐面すべり挙動調査
峯田才寛, 三浦誠司, 岡 和彦, 宮島達也
日本金属学会春期大会, 2014年03月07日, 日本語, 口頭発表（一般）
［国内会議］

長時間熱処理を施したMg‐Zn‐Y合金の組織観察
糸井貴臣, 荒川信司, 三浦誠司
日本金属学会講演概要(CD-ROM), 2014年03月07日, 日本語

Nb‐Si合金の破壊挙動に対するMo,B添加の影響
山野内拓也, 三浦誠司
日本金属学会講演概要(CD-ROM), 2014年03月07日, 日本語

Mg‐Zn‐Y3元系状態図におけるLPSO相近傍相平衡の実験的追求 第2報
三浦誠司, 大久保賢二, 坂口紀史, 山田亮, 山田亮, 毛利哲夫, 毛利哲夫, 堀内寿晃, 源聡
日本金属学会春期講演大会, 2014年03月07日, 日本語, 口頭発表（一般）
［国内会議］

マグネシウム合金単結晶におけるtwinning‐detwinning挙動の直接観察と組成依存性
三浦誠司
日本金属学会春期講演大会, 2014年03月07日, 日本金属学会, 日本語, 口頭発表（基調）
東京, ［国内会議］

ニオブ基を中心とした耐火金属基合金設計の要素の検討
三浦誠司
日本金属学会講演概要(CD-ROM), 2014年03月07日, 日本語, 口頭発表（基調）
［国内会議］

Mg 合金単結晶の双晶変形の直接観察とdetwinning によるひずみ回復現象　　　　　　　　　　　　　　　
三浦 誠司
第２回プラストンに基づく変形現象研究会 ～特異な変形挙動を示すMg合金および金属間化合物～, 2013年12月13日, プラストン研究会, 日本語, 口頭発表（招待・特別）
京都大学, ［招待講演］, ［国内会議］

Phase equilibrium between B2 Aluminide NiAl and Nb-Mo bcc solid solution phase　　　　　　　　　　　　　　　
S. Miura, Y. Sekito, T. Okawa, T. Yamanouchi, T. Mohri
Thermec2013, 2013年12月05日, 英語, 口頭発表（招待・特別）
LasVegas, USA, ［招待講演］, ［国際会議］

Monte Carlo SimulationによるThermo Migrationの解析
齋藤実穂, 滝沢聡, 三浦誠司, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2013年09月03日, 日本語

分子動力学法による過冷却液体における粘度のモデル計算
内山友裕, 滝沢聡, 三浦誠司, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2013年09月03日, 日本語

Mg‐Y合金単結晶におけるde‐twinningによる歪回復効果
峯田才寛, 岩本友也, 三浦誠司, 毛利哲夫
日本金属学会講演概要(CD-ROM), 2013年09月03日, 日本語

高Nb側組成域のNb‐Mo‐Si‐B四元系状態図の決定
山野内拓也, 三浦誠司
日本金属学会講演概要(CD-ROM), 2013年09月03日, 日本語

Multi Phase Field法を用いたFe組織の時間発展予測
三村健志朗, 三浦誠司, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2013年09月03日, 日本語

Cluster Variation MethodおよびNudged Elastic Band法によるB2規則相中の1/2[111]らせん転位のパイエルスポテンシャルの計算
山田泰徳, 三浦誠司, 毛利哲夫
日本金属学会講演概要(CD-ROM), 2013年09月03日, 日本語

スペクトル解析によるフェーズフィールド組織画像の評価
伊勢谷健司, 三浦誠司, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2013年09月03日, 日本語

純Mg単結晶の底面すべり活動への{10-12}双晶界面の影響
山口修平, 三浦誠司, 毛利哲夫
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2013年07月26日, 日本語

クラスター変分法とフェーズフィールド法を用いた相変態過程の計算
珍田祥宏, 毛利哲雄, 三浦誠司
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2013年07月26日, 日本語

Nb₅Si₃微小試験片を用いた破壊挙動の研究
鈴木詩織, 三浦誠司, 関戸信彰, 大村孝仁, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2013年07月26日, 日本語

純せん断試験によるMg単結晶の非底面すべり挙動へのY添加の影響
峯田才寛, 三浦誠司, 毛利哲夫
日本金属学会講演概要(CD-ROM), 2013年03月13日, 日本語

Mg‐Y‐Zn3元系におけるW相とH相に関する熱力学解析
源聡, 堀内寿晃, 三浦誠司
日本金属学会講演概要(CD-ROM), 2013年03月13日, 日本語

放射光その場測定による多結晶MgYZn鋳造試料の相・組織安定性
奥田浩司, 堀内俊希, 三浦誠司, 山崎倫昭, 河村能人, 小原真司, 尾原幸治
日本金属学会講演概要(CD-ROM), 2013年03月13日, 日本語, 口頭発表（基調）
［招待講演］, ［国内会議］

Nb‐Si‐X系状態図のNb‐rich域の相平衡と組織および機械的性質
三浦誠司, 大川琢哉, 畑端徹, 畑端徹, 毛利哲夫
日本金属学会講演概要(CD-ROM), 2013年03月13日, 日本語

Mg‐Zn‐Y3元系状態図におけるLPSO相近傍相平衡の実験的追求
三浦誠司, 山田亮, 毛利哲夫, 堀内寿晃, 源聡
日本金属学会講演概要(CD-ROM), 2013年03月13日, 日本語

Mg‐Zn‐Y 3元系平衡状態図におけるLPSO相近傍の精密化
山田亮, 三浦誠司, 毛利哲雄, 堀内寿晃, 源聡
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2013年01月24日, 日本語

Effect of microstructure on the mechanical properties of Nb/Nb5Si3 alloys investigated by using in-situ bending test　　　　　　　　　　　　　　　
三浦 誠司
MS&T2012 Beyond the Ni-base superalloys, 2012年10月08日, 英語, 口頭発表（招待・特別）
Pittsburgh, ［招待講演］, ［国際会議］

高Ni鋼におけるγ”(Ni₃Nb)の析出挙動
佐野佳祐, 大野直子, 鵜飼重治, 林重成, 三浦誠司, 井上利彦, 山下真一郎
日本金属学会講演概要(CD-ROM), 2012年09月03日, 日本語

微小試験片を用いたNb‐Si合金の破壊靭性評価と組織の影響
大川琢哉, 畑端徹, 畑端徹, 三浦誠司, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2012年09月03日, 日本語

溶解法によってTiC及びZrCを添加したMo‐Si‐B合金の破壊靱性
森山貴裕, 吉見享祐, 丸山公一, 三浦誠司, 毛利哲雄, 渡辺精一
日本金属学会講演概要(CD-ROM), 2012年09月03日, 日本語

Nb‐Si系耐熱合金の研究動向
三浦誠司
日本金属学会講演概要(CD-ROM), 2012年09月03日, 日本語, 口頭発表（基調）
［招待講演］, ［国内会議］

Mg_50.7Zn_37.4Y_11.9合金及びMg_21.8Zn_59.4Y_18.8合金の固相域における平衡相の同定(3)
大平裕己, 堀内寿晃, 三浦誠司, 坂口紀史, 源聡
日本金属学会講演概要(CD-ROM), 2012年09月03日, 日本語

AZ系Mg合金の塑性変形挙動に及ぼす析出物の影響
岩本友也, 高野翔太, 三浦誠司, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2012年09月03日, 日本語

Mechanical properties of Nb-Si based alloys with microstructure modified by applying phase stability concept　　　　　　　　　　　　　　　
三浦 誠司
Creep2011, 2012年05月22日, 英語, 口頭発表（招待・特別）
Kyoto, ［招待講演］, ［国際会議］

遷移元素添加Nb‐Si合金の組織および高温機械的特性
三浦誠司, 畑端徹, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2012年03月15日, 日本語

Mg_50.7Zn_37.4Y_11.9合金及びMg_21.8Zn_59.4Y_18.8合金の固相域における平衡相の同定(2)
堀内寿晃, 雨夜俊明, 大平裕己, 三浦誠司, 源聡, 野本祐春
日本金属学会講演概要(CD-ROM), 2012年03月15日, 日本語

Mg合金の双晶組織と変形挙動　　　　　　　　　　　　　　　
三浦 誠司
平成23年度第4回研究会「軽金属材料の組織・力学特性制御」, 2012年01月26日, 日本鉄鋼協会・日本金属学会関西支部 材料開発研究会, 日本語, 口頭発表（招待・特別）
大阪大学吹田キャンパス, ［招待講演］, ［国内会議］

Mg合金AZ31における集合組織導入の双晶形成過程に及ぼす影響
高野翔太, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2012年01月19日, 日本語

EFFECT OF ALLOYING ELEMENTS ON THE SHAPE OF NB SILICIDE EMBEDDED IN NB MATRIX　　　　　　　　　　　　　　　
Seiji Miura, Toru Hatabata, Tetsuo Mohri
Plasticity 2012, 2012年01月03日, 英語, 口頭発表（基調）
プエルトリコ, ［招待講演］, ［国際会議］

Mg_90.0Zn_2.5Y_7.5合金の平衡相の同定
大平裕己, 堀内寿晃, 三浦誠司, 源聡, 野本祐春
日本金属学会講演概要(CD-ROM), 2011年10月20日, 日本語

Mg₅₃Zn₃₆Y₁₁合金及びMg₂₅Zn₅₈Y₁₇合金の固相域における平衡相の同定
池江勇人, 堀内寿晃, 三浦誠司, 源聡, 野本祐春
日本金属学会講演概要(CD-ROM), 2011年10月20日, 日本語

元素添加によるNb‐Si合金の組織および機械的特性への影響
畑端徹, 三浦誠司, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2011年10月20日, 日本語

Mg合金AZ91Dの塑性変形挙動に及ぼす析出物の影響
岩本友也, 三浦誠司, 毛利哲雄
日本金属学会講演概要(CD-ROM), 2011年10月20日, 日本語

Nb‐Si‐Zr合金のレーザー顕微鏡によるin‐situ亀裂観察及び破壊靭性値の測定
大川琢哉, 三浦誠司, 毛利哲雄, 関戸信彰
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2011年07月22日, 日本語

OS2003 Mg合金集合組織における双晶形成のその場観察とEBSD解析(OS20-1 双晶,OS-20 HCP金属の実験力学と計算力学)
三浦 誠司, 佐藤 伊都也, 毛利 哲夫
M&M材料力学カンファレンス, 2011年07月16日, 日本語
A commercial Mg alloy, AZ31B, has been used widely. In the texture of AZ31B sheet, {101^^-2} twin is expected to form by applying an extension strain parallel to the c-axis, which is equivalent to the a-axis compression strain. In this study, an in-situ bending test of AZ31B sheet with a texture was conducted under a confocal scanning laser microscope to observe twinning by applying compression stress along a direction almost perpendicular to the c-axis of grains. In addition, EBSD techniques were used for the analysis of crystal orientation evolution during compression testing. In-situ observation revealed that the growth of twins is apparent during plastic bending deformation. EBSD analysis suggested that twinning behavior obey Schmid's law even in the polycrystal.

Ti(Pt,Ir)の形状記憶効果の組成依存性
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2011年04月20日, 日本語

Nb‐Si合金への第三添加元素による構成相と組織への影響
畑端徹, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2011年01月27日, 日本語

Mg合金集合組織における双晶形成のその場観察とEBSD解析　　　　　　　　　　　　　　　
M&M2011材料力学カンファレンスCD-ROM, 2011年

Mg合金集合組織における双晶形成のその場観察とEBSD解析
三浦誠司, 佐藤伊都也, 毛利哲夫
日本機械学会M&M材料力学カンファレンス(CD-ROM), 2011年, 日本語

Ti‐Pt‐Ir三元合金のマルテンサイト変態温度
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2010年09月25日, 日本語

Mg‐Zn‐Y3元系合金のX相近傍における凝固開始温度の評価
池江勇人, 山川雄司, 百武眞宏, 堀内寿晃, 三浦誠司, 源聡, 野本祐春
日本金属学会講演概要, 2010年09月25日, 日本語

Al‐B2成分系におけるAlB₁₂相の物性評価
大久保彩, 三浦誠司, 篠田哲守, 清宮義博
日本金属学会講演概要, 2010年09月25日, 日本語

Nbss/Nb₅Si₃二相組織の形成過程と機械的特性に及ぼす添加元素の影響
棚橋達一, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2010年09月25日, 日本語

Mg‐Y固溶体単結晶における塑性変形挙動
佐藤伊都也, 三浦誠司, 毛利哲雄, 向井敏司
日本金属学会講演概要, 2010年09月25日, 日本語

一方向凝固したNb‐Si‐Zr合金組織の三次元構造の解析
畑端徹, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2010年07月29日, 日本語

Mg合金AZ31B集合組織中における変形双晶成長のin‐situ観察
佐藤伊都也, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2010年07月29日, 日本語

Mg合金AZ91Dの双晶変形挙動に及ぼす析出物の影響
岩本友也, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2010年07月29日, 日本語

Mg‐Zn‐Y3元系状態図の熱力学的解析とフェーズフィールド法による組織形成計算
江渡寿郎, 源聡, 野本祐春, 濱谷篤志, 濱谷篤志, 堀内寿晃, 三浦誠司
日本金属学会講演概要, 2010年03月28日, 日本語

TiPtIrの擬弾性効果と形状記憶特性
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2010年03月28日, 日本語

組織制御したNb‐Si‐Zr合金の変形及び破壊挙動
堤之義, 三浦誠司, 大久保賢二, 毛利哲雄
日本金属学会講演概要, 2009年09月15日, 日本語

W相を含むMg‐Zn‐Y三元系合金の相平衡
濱谷篤志, 堀内寿晃, 大久保賢二, 三浦誠司
日本金属学会講演概要, 2009年09月15日, 日本語

Directional solidified Nbss/Nb5Si3 eutectic alloy with full-lamellar microstructure
LI Yulong, LI Yulong, MIURA Seiji, MOHRI Tetsuo, OHSASA Kenichi, MA Chaoli, ZHANG Hu
日本金属学会講演概要, 2009年09月15日, 英語

炭材反応挙動の解明と反応速度の定量化
山本雄一郎, 柏谷悦章, 大笹憲一, 三浦誠司, 西村勝, 加藤健次, 窪田征弘, 野村誠治, 国友和也, 内藤誠章
材料とプロセス(CD-ROM), 2009年09月01日, 日本語

金属間化合物Nb₃Siの相安定性へのW,Mo,Taの影響
棚橋達一, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2009年07月24日, 日本語

Nb_ss/Nb₅Si₃二相合金の室温における破壊と亀裂進展
堤之義, 三浦誠司, 大久保賢二, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2009年07月24日, 日本語

冷間加工したFe‐Mn‐Al‐C合金の熱処理組織および機械的性質
伊勢谷健司, 石井宏明, 三浦誠司, 毛利哲夫, 大久保賢二
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2009年07月24日, 日本語

圧縮および曲げ試験におけるMg合金AZ31B集合組織中の双晶変形導入
佐藤伊都也, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2009年07月24日, 日本語

OS0309 擬似粒界としてMg単結晶に導入した双晶界面の変形双晶活動に及ぼす影響(非立方晶型金属材料の変形現象とそのモデル化,オーガナイズドセッション)
三浦 誠司
M&M材料力学カンファレンス, 2009年07月24日, 日本語
Twinning behavior of Mg-Zn alloy single crystal is investigated. It was found that both the work-hardening rate and the number of serration in the stress strain curve of the specimen depends on the stress axis ([1010] or [1120]) by which the number of operative twi systems changes. In order to understand the effect of grain boundaries on the twinning in Mg alloys, twin boundaries are introduced to single crystal specimens as pseudo grain boundaries. Using EBSD analysis, the importance of the strain compatibility at grain boundaries for introducing twins is confirmed by examining the microst...

擬似粒界としてMg単結晶に導入した双晶界面の変形双晶活動に及ぼす影響
三浦誠司
日本機械学会M&M材料力学カンファレンス(CD-ROM), 2009年07月23日, 日本語

マイクロインデンテーション法による純鉄の脱不働態‐再不働態化挙動における面方位依存性
山本隆登志, 伏見公志, 金野英隆, 三浦誠司
材料と環境講演集, 2009年05月08日, 日本語

純鉄の不働態化における冷間圧延の影響
山本隆登志, 伏見公志, 金野英隆, 三浦誠司
電気化学会大会講演要旨集, 2009年03月29日, 日本語

W相を含むMg‐Y‐Zn三元系合金の平衡組成
堀内寿晃, 筒井駿平, 佐々木怜欧, 大久保賢二, 三浦誠司
日本金属学会講演概要, 2009年03月28日, 日本語

Mg₉₆Zn₂Y₂合金及びMg₈₄Zn₈Y₈合金の固相域における平衡相の同定
濱谷篤志, 高津淳, 堀内寿晃, 大久保賢二, 三浦誠司
日本金属学会講演概要, 2009年03月28日, 日本語

ヘマタイト中に注入された炭素イオンの結合状態
柏谷悦章, 木下博嗣, 三浦誠司, 中光強
材料とプロセス(CD-ROM), 2009年03月01日, 日本語

純鉄の不働態化における金属組織の影響
山本隆登志, 伏見公志, 金野英隆, 三浦誠司
化学系学協会北海道支部冬季研究発表会講演要旨集, 2009年01月26日, 日本語

Heusler型金属間化合物の相安定性の評価
最首秀人, 滝沢聡, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2009年01月16日, 日本語

擬似粒界としてMg単結晶に導入した双晶界面の変形双晶活動に及ぼす影響　　　　　　　　　　　　　　　
日本機械学会材料力学カンファレンス（CD-ROM）, 2009年

共晶‐共析複合反応を利用したNb₅Si₃分散Nb基合金の組織設計と変形挙動
三浦誠司
日本金属学会講演概要, 2008年09月23日, 日本語, 口頭発表（基調）
［招待講演］, ［国内会議］

Mg‐Y‐Zn三元系合金の固液共存域における液相組成変化(2)
堀内寿晃, 濱谷篤志, 大久保賢二, 三浦誠司
日本金属学会講演概要, 2008年09月23日, 日本語

Mg₈₄Y₉Zn₇合金の固相域における平衡相の同定
濱谷篤志, 堀内寿晃, 大久保賢二, 三浦誠司
日本金属学会講演概要, 2008年09月23日, 日本語

一方向凝固したNb‐Si‐Zr合金組織への育成速度の影響
関戸義仁, 三浦誠司, 大久保賢二, 毛利哲雄
日本金属学会講演概要, 2008年09月23日, 日本語

TiPtの形状記憶特性
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2008年09月23日, 日本語

Sn希薄固溶体の変形挙動の温度依存性
三浦誠司, 大久保賢二, 柴田純夫, 安永亮
日本金属学会講演概要, 2008年09月23日, 日本語

組織を変えたNb/Nb₅Si₃二相合金の常温機械的特性の比較
堤之義, 村里有紀, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会日本鉄鋼協会両支部合同夏季講演大会概要集, 2008年07月10日, 日本語

TiPtの擬弾性特性
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2008年03月26日, 日本語

凝固速度による異相間方位関係の変化から見た界面エネルギーコントロールの可能性
三浦誠司
日本金属学会講演概要, 2008年03月26日, 日本語, 口頭発表（基調）
［招待講演］, ［国内会議］

Ti‐Al系合金における拡散のKinetic Monte Carloシミュレーション
佐藤和史, 滝沢聡, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2008年03月26日, 日本語

Mg‐Y‐Zn三元系合金の固液共存域における液相組成変化
堀内寿晃, 小野朱美, 吉岡健太郎, 渡辺威郎, 大久保賢二, 三浦誠司, 毛利哲雄, 田村茂之
日本金属学会講演概要, 2008年03月26日, 日本語

加工を施したAl‐Ti系微細化剤添加によるMg鋳造材の組織変化と強度
渡辺義見, 高延氷, 郭俊卿, 佐藤尚, 三浦誠司, 三浦博己
日本金属学会講演概要, 2008年03月26日, 日本語

展伸用Mg合金AZ31Bへの双晶導入と集合組織への影響
渡辺威郎, 三浦誠司, 大久保賢二, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2008年01月11日, 日本語

Development of SiC Particle-dispersed Mg-based Functionally Graded Materials by a Centrifugal Solid-particle Method　　　　　　　　　　　　　　　
Proceedings of the US-Japan Conference on Composite Materials, 2008年

Analysis of deformation twinning in single crystalline binary Mg alloys　　　　　　　　　　　　　　　
NIMS conference 2008 abstracts, 2008年

細孔反応法により作製した金属間化合物繊維強化複合材料の強度評価
渡辺義見, 権田信吾, 佐藤尚, 三浦誠司
日本複合材料学会研究発表講演会予稿集, 2008年, 日本語

Deformation behavior of Mg alloy single crystals with rare-earth elements Y and Dy : Basal slip and twinning　　　　　　　　　　　　　　　
三浦 誠司
物質材料研究機構 セミナー, 2007年12月19日, 英語, 口頭発表（招待・特別）
［国内会議］

Microstructure control of Nb-Si-Zr alloy by combining eutectic and eutectoid reactions and its mechanical properties　　　　　　　　　　　　　　　
三浦 誠司
Structural Silicides, 2007年11月16日, 軽金属学会東北支部, 英語, 口頭発表（招待・特別）
東北大学, ［招待講演］, ［国際会議］

Fe‐Mn‐Al‐C合金系におけるα/κ(Fe₃AlC)ラメラ組織の方位関係と強度
三浦誠司, 石井宏明, 大久保賢二, 毛利哲雄
日本熱処理技術協会講演大会講演概要集, 2007年10月, 日本語

拡散バリヤコーティングを施したニッケル基超合金の変形のその場観察(その2)
三浦誠司, 大久保賢二, 毛利哲雄, 吉岡隆幸, 成田敏夫
日本金属学会講演概要, 2007年09月19日, 日本語

Ni₃Al合金単結晶の応力負荷徐冷における変形挙動
三浦誠司, 毛利哲雄, 三島良直, 鈴木朝夫
日本金属学会講演概要, 2007年09月19日, 日本語

Nb‐Si‐Zr合金の亀裂形成傾向と組織の関係
村里有紀, 三浦誠司, 大久保賢二, 毛利哲雄, 木村好里, 三島良直
日本金属学会講演概要, 2007年09月19日, 日本語

Mg‐Ti複合材料におけるMg/Ti界面近傍での塑性変形挙動
川本裕晃, 川本裕晃, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2007年09月19日, 日本語

Ti‐Al拡散対における反応拡散の理論計算
佐藤和史, 滝沢聡, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2007年09月19日, 日本語

ノズル直径の異なる浸漬ランス側面からのガス吹込みによる気泡発生頻度
大石進太郎, 井口学, 毛利哲雄, 三浦誠司, 辻野良二, 平塚彰
日本金属学会日本鉄鋼協会両支部合同夏季講演大会概要集, 2007年07月09日, 日本語

Mg単結晶の高温変形挙動とその結晶方位およびひずみ速度依存性
三浦 博己, 塩谷 裕司, 楊 続躍, 酒井 拓, 渡辺 義見, 三浦 誠司
大会講演概要, 2007年04月11日, 日本語

Mg単結晶の高温変形挙動とその結晶方位およびひずみ速度依存性
三浦博己, 塩谷裕司, YANG X, 酒井拓, 渡辺義見, 三浦誠司
軽金属学会大会講演概要, 2007年04月11日, 日本語

L1₂型金属間化合物Co₃(Al,W)の機械的性質
三浦誠司, 大久保賢二, 毛利哲雄
日本金属学会講演概要, 2007年03月27日, 日本語

希土類元素添加Mg希薄固溶体合金単結晶の変形挙動
三浦誠司, 豊田武, 今川成樹, 大久保賢二, 毛利哲雄, 三浦博己, 渡辺義見
日本金属学会講演概要, 2007年03月27日, 日本語

half‐Heusler型金属間化合物HfMSn(M=Ni,Pt)の電子状態
千葉隼稔, 滝沢聡, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2007年01月10日, 日本語

Nb‐Si‐Zr共晶合金の作製と球状Nb₅Si₃化合物分散化熱処理
村里有紀, 三浦誠司, 大久保賢二, 毛利哲雄, 木村好里, 三島良直
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2007年01月10日, 日本語

Mg‐Y合金の時効析出
今川成樹, 三浦誠司, 大久保賢二, 毛利哲雄, 三浦博己, 渡辺義見
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2007年01月10日, 日本語

介在物を含んだ再結晶シミュレーション
安藤聖弘, 滝沢聡, 三浦誠司, 毛利哲雄
日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2007年01月10日, 日本語

拡散バリヤコーティングを施したニッケル基超合金の変形のその場観察
三浦誠司, 大久保賢二, 毛利哲雄, 吉岡隆幸, 成田敏夫
日本金属学会講演概要, 2006年09月16日, 日本語

変形双晶を導入したMg‐Dy固溶体合金の変形挙動
豊田武, 三浦誠司, 大久保賢二, 毛利哲雄, 三浦博己, 渡辺義見
日本金属学会講演概要, 2006年09月16日, 日本語

Ti(Pt,Ir)の高温形状記憶特性
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本機械学会材料力学部門講演会講演論文集, 2006年08月03日, 日本語

Mg‐Ti複合材料におけるMg/Ti界面近傍での塑性変形挙動
川本裕晃, 大久保賢二, 三浦誠司, 毛利哲雄, 三浦博己, 渡辺義見
日本金属学会日本鉄鋼協会両支部合同夏季講演大会概要集, 2006年07月12日, 日本語, 口頭発表（一般）
［国内会議］

Microstructural Control of Nb-Si Alloy with Invariant Reactions　　　　　　　　　　　　　　　
Seiji Miura, J.H. Kim, K. Ohkubo, Y. Kimura, N. Sekido, Y. Mishima, T. Mohri
International Conference on PROCESSING & MANUFACTURING OF ADVANCED MATERIALS - Processing, Fabrication, Properties, Applications - (THERMEC'2006), 2006年07月04日, 英語, 口頭発表（招待・特別）
Vancouver, Canada, ［招待講演］, ［国際会議］

High-Temperature Shape Memory Effect of Ti-(Pt, Ir)　　　　　　　　　　　　　　　
Y. Yamabe-Mitarai, T. Hara, S.Miura, H. Hosoda
International Conference on PROCESSING & MANUFACTURING OF ADVANCED MATERIALS - Processing, Fabrication, Properties, Applications - (THERMEC'2006), 2006年07月04日, 英語, 口頭発表（招待・特別）
Vancouver, Canada, ［招待講演］, ［国際会議］

Heusler型金属間化合物Fe₂VAlの原子配列の規則化と電気抵抗率変化
冨久尾剛, 滝沢聡, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2006年03月21日, 日本語

純Mg単結晶の高温変形挙動に関する研究
塩谷裕司, 三浦博己, 酒井拓, 渡辺義見, 三浦誠司
日本金属学会講演概要, 2006年03月21日, 日本語

IrTiの相変態と組織
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2006年03月21日, 日本語

Nb‐Si基合金の共析変態反応速度および結晶学的方位関係への添加元素と凝固方法の影響
金鐘和, 三浦誠司, 大久保賢二, 毛利哲雄, 木村好里, 三島良直
日本金属学会講演概要, 2006年03月21日, 日本語

ミクロンサイズ薄膜の熱膨張測定の試み
三浦誠司, 岡和彦, 大久保賢二, 毛利哲雄
日本金属学会講演概要, 2006年03月21日, 日本語

格子欠陥制御工学‐材料機能のイノベーション 微視組織の定量的把握に対するフーリエ変換に基づくアプローチ
三浦誠司, 渡辺精一
日本金属学会講演概要, 2006年03月21日, 日本語

{1012}双晶を導入したMg‐Dy固溶体合金単結晶の変形挙動
豊田武, 三浦誠司, 大久保賢二, 毛利哲雄, 三浦博己, 渡辺義見
日本金属学会講演概要, 2006年03月21日, 日本語

Gd系薄膜シンチレータの開発(3)~Gdパイロシリケイト粉体シンチレータの合成と評価~
山口達, 春名潤, 金子純一, 須佐憲三, 三浦誠司, 八木康洋, 川村宗範, 奥隆之, 藤田文行, 本間彰, 石橋浩之, 沢村晃子, 古坂道弘, 清水裕彦, 鬼柳善明
日本原子力学会春の年会要旨集(CD-ROM), 2006年03月09日, 日本語

Gd系薄膜シンチレータの開発(2)~焼結による薄膜化~
土田昇平, 春名潤, 金子純一, 山口達, 須佐憲三, 三浦誠司, 奥隆之, 藤田文行, 本間彰, 沢村晃子, 古坂道弘, 清水裕彦, 鬼柳善明
日本原子力学会春の年会要旨集(CD-ROM), 2006年03月09日, 日本語

Mg多結晶の動的再結晶と破壊挙動
三浦 博己, 楊 続躍, 酒井 拓, 渡辺 義見, 三浦 誠司
大会講演概要, 2005年10月20日, 日本語

Mg多結晶の動的再結晶と破壊挙動
三浦博己, 酒井拓, 渡辺義見, 三浦誠司, YANG X
軽金属学会大会講演概要, 2005年10月20日, 日本語

TMicrostructural Control of Nb-Si alloy for Large Nb Grain Formation through Eutectic and Eutectoid Reactions　　　　　　　　　　　　　　　
三浦 誠司
The 6th International Workshop on Advanced Intermetallics and Metallic Materials, 2005年10月09日, 英語, 口頭発表（招待・特別）
Yangzhou/Nanjing, Jiangsu, P.R. China, ［招待講演］, ［国際会議］

金属間化合物材料の新たな可能性 Nb‐Si基合金の共析変態によるNb粒粗大化と添加元素の影響
三浦誠司, 大久保賢二, 毛利哲雄
日本金属学会講演概要, 2005年09月28日, 日本語

IrTiにおける相変態のTi濃度依存性
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2005年09月28日, 日本語

Mg合金/Ti繊維複合材料の曲げ変形挙動
矢野かおり, 大久保賢二, 三浦誠司, 毛利哲雄, 三浦博己, 渡辺義見
日本金属学会講演概要, 2005年09月28日, 日本語

Nb‐Si合金の共析変態に及ぼす添加元素と組織の影響
三浦誠司, 大久保賢二, 毛利哲雄
日本金属学会講演概要, 2005年03月29日, 日本語

ホイスラー型金属間化合物Fe₂(V,Ti,Cr)Alの電気抵抗率測定および電子論計算
冨久尾剛, 滝沢聡, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2005年03月29日, 日本語

(Pt,Ir)Tiの形状記憶効果
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2005年03月29日, 日本語

Mg‐Dy固溶体単結晶の双晶変形挙動
三浦誠司, 瀧花誠司, 豊田武, 大久保賢二, 毛利哲雄, 渡辺義見, 三浦博己
日本金属学会講演概要, 2005年03月29日, 日本語

Mg単結晶の高温変形とその超塑性挙動機構の解明
三浦 博己, 楊 続躍, 酒井 拓, 能川 久史, 渡辺 義見, 三浦 誠司
大会講演概要, 2004年11月01日, 日本語

Mg単結晶の高温変形とその超塑性挙動機構の解明
三浦博己, YANG X, 酒井拓, 能川久史, 渡辺義見, 三浦誠司
軽金属学会大会講演概要, 2004年11月01日, 日本語

A Geometrical Approach to Multi-component Phase Diagrams　　　　　　　　　　　　　　　
三浦 誠司
User Aspects of Phase Diagrams, 2004年10月18日, 英語, 口頭発表（招待・特別）
Columbus, OH, ［招待講演］, ［国際会議］

単結晶と多結晶の比較に基づく等組成CuAuの相変態に対する粒界の影響
奥野裕之, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2004年09月28日, 日本語

Mg‐Dy固溶体単結晶の再結晶挙動に対する双晶変形の影響
瀧花誠司, 大久保賢二, 三浦誠司, 毛利哲雄, 渡辺義見, 三浦博己
日本金属学会講演概要, 2004年09月28日, 日本語

遠心力固相法によるチタン粒子分散マグネシウム基傾斜機能材料の開発
渡辺義見, 佐藤隆芳, 三浦誠司, 三浦博己
日本金属学会講演概要, 2004年09月28日, 日本語

Nb‐Si合金の共析分解速度,組織形態と方位関係へのZr添加および熱処理温度の影響
三浦誠司, 大久保賢二, 毛利哲雄
日本金属学会講演概要, 2004年09月28日, 日本語

α‐Fe+κ‐Fe₃AlC二相ラメラ組織における変形前後での結晶学的方位関係
石井宏明, 北本めぐみ, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2004年09月28日, 日本語

Mg単結晶の超塑性挙動とその結晶方位依存性
三浦博己, 楊続躍, 酒井拓, 能川久史, 渡辺義見, 三浦誠司
日本金属学会講演概要, 2004年09月28日, 日本語

Fe-Mn-Al-C合金におけるγ+κ二相組織の結晶方位関係と機械的性質
石井 宏明, 三浦 誠司, 毛利 哲雄
材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2004年09月01日, 日本語

Fe‐Mn‐Al‐C合金におけるγ+κ二相組織の結晶方位関係と機械的性質
石井宏明, 三浦誠司, 毛利哲雄
材料とプロセス, 2004年09月01日, 日本語

CrおよびSiを添加したMo₃Al金属間化合物の組織と酸化特性
関口剛, 三浦誠司, 落合鍾一
日本金属学会講演概要, 2004年03月30日, 日本語

Ir添加PtTiの機械的特性
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2004年03月30日, 日本語

マグネシウム固溶体単結晶の常温塑性変形挙動における変形双晶の役割
古田森, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2004年03月30日, 日本語

Al₃Ti‐Mo₃Alラメラ組織における相間の結晶学的方位関係と高温変形メカニズム
三浦誠司, 島村宏之, 大久保賢二, 毛利哲雄
日本金属学会講演概要, 2004年03月30日, 日本語

Fe‐Mn‐Al‐C合金におけるα+κ(Fe₃AlC)及びγ+κ各2相組織の形態と方位関係
石井宏明, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2004年03月30日, 日本語

GSO中性子シンチレータ薄膜化の試み
土田昇平, 山口達, 金子純一, 須佐憲三, 三浦誠司, 奥隆之, 藤田文行, 古坂道弘, 清水裕彦
日本中性子科学会年会講演概要集, 2004年, 日本語

GSO中性子シンチレータの合成と評価
山口達, 金子純一, 三浦誠司, 須佐憲三, 奥隆之, 藤田文行, 本間彰, 古坂道弘, 清水裕彦
日本中性子科学会年会講演概要集, 2004年, 日本語

ZK60Aの組織変化に対するTi添加の影響
中村元城, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年10月11日, 日本語

分子動力学法を用いたNiの熱物性量の評価
菅戸高明, 滝沢聡, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年10月11日, 日本語

Fe‐Mn‐Al‐C合金の変形挙動に対する析出Fe₃AlC(κ相)の形態の影響
石井宏明, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年10月11日, 日本語

Fe‐Pd基L1₀型規則相へのNi添加効果の現象論的計算
堀内寿晃, 五十嵐正晃, 阿部冨士雄, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年10月11日, 日本語

Ir‐rich(Ir,Pt)Tiの相変態
御手洗容子, 原徹, 三浦誠司, 細田秀樹
日本金属学会講演概要, 2003年10月11日, 日本語

マグネシウム固溶体単結晶の常温塑性変形挙動と高温での組織変化
古田森, 瀧花誠司, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年10月11日, 日本語

Al₃Ti‐Mo₃Al二相合金の高温変形挙動と変形に伴う組織変化 第二報
島村宏之, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年10月11日, 日本語

分子動力学シミュレーションを用いたNiの熱物性量の計算
菅戸高明, 滝沢聡, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年03月27日, 日本語

Mo₃Al‐Al₃Ti二相合金の高温変形挙動とそれに伴う組織変化
島村宏之, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年03月27日, 日本語

Fe‐Mn‐Al‐C系合金のα+Fe₃AlC(κ)共析二相組織における相間隔の機械的性質への影響
石井宏明, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2003年03月27日, 日本語

非化学量論組成Ni₃Alの低温変形応力に対する非等方的原子配列の影響の検討
三浦誠司, 滝沢聡, 三島良直, 毛利哲雄
日本金属学会講演概要, 2003年03月27日, 日本語

Effects of Microstructure on High Temperature Mechanical Properties of Al3Ti-Mo3Al two-phase Intermetallic Alloys　　　　　　　　　　　　　　　
Seiji Miura, Hiroyuki Shimamura, Juri Fujinaka, Tetsuo Mohri
The Symposium on Intermetallic and Advanced Metallic Materials in the honor of Dr. C. T. Liu, 2003年02月, TMS, 英語, 口頭発表（招待・特別）
San Diego, California, ［招待講演］, ［国際会議］

Fe‐Mn‐Al‐C系合金のα+Fe₃AlC(κ)二相における組織とその機械的性質への影響
石井宏明, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2002年11月02日, 日本語

Fe‐Pd‐Ni系L1₀―disorder変態の現象論的計算
堀内寿晃, 五十嵐正晃, 阿部冨士雄, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2002年11月02日, 日本語

(Nb,Zr)/(Nb,Zr)₅Si₃二相合金のラメラー間隔に及ぼすZr添加量および熱処理温度の関係
青木美喜, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2002年11月02日, 日本語

Fe‐Mn‐Al‐C系におけるκ相の析出挙動に与える熱処理過程の影響
石井宏明, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2002年03月28日, 日本語

Ti(Ni,Pd)合金の熱膨張と相変態
奥津和俊, 辻昌宏, 細田秀樹, 若島健司, 宮崎修一, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 2002年03月28日, 日本語

Microstructural control of Al3Ti-based Alloys designed by Multi-component Phase Diagrams　　　　　　　　　　　　　　　
Seiji Miura, Juri Fujinaka, Tetsuo Mohri
Tenth International Symposium on Processing and Fabrication of Advanced Materials (PFAM X), 2001年10月, 英語, 口頭発表（招待・特別）
Indianapolis, ［招待講演］, ［国際会議］

Martensitic transformation, long range order and thermal properties of Ni₂MnGa　　　　　　　　　　　　　　　
Symposium on SMART2000, "Third international Symposium on Shape Memory Alloys and Related Technology", 2000年

三元系の反応経路図を求めるためのアルゴリズムとその応用
海野裕人, 三浦誠司, 三島良直, 鈴木朝夫, 毛利哲雄
日本金属学会講演概要, 1999年11月20日, 日本語

Nb‐Si‐Ti系内(Nb)/Nb₅Si₃合金の機械的性質に及ぼすラメラー間隔の影響
関戸信彰, 木村好里, 三浦誠司, 三島良直
日本金属学会講演概要, 1999年11月20日, 日本語

マグネシウム単結晶のすべり変形に対する溶質元素の影響
山本卓, 岡田峰光, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1999年11月20日, 日本語

Nb₃Si→Nb/Nb₅Si₃分解反応に及ぼすTi添加および高圧雰囲気の影響
福井俊彦, 田中良平, 三浦誠司, 三島良直
日本金属学会講演概要, 1999年11月20日, 日本語

Nb‐Nb₃Si‐Nb₅Si₃3相平衡に対する添加元素(Ta,Zr,Hf)の影響
佐伯泰彦, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1999年11月20日, 日本語

Retro効果の古典的核生成理論に基づくシミュレーション
鵜沢秀幸, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1999年11月20日, 日本語

高温耐熱材料のための金属間化合物の材料設計
三浦誠司
北海道歯学会学術大会プログラム講演内容抄録, 1999年05月14日, 日本語

応力‐歪み曲線の計算とCottrell‐Stokesの法則
庄司哲也, 大野宗一, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1999年03月29日, 日本語

正方晶の相安定性に対するクラスター変分法に基づく考察
鵜沢秀幸, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1999年03月29日, 日本語

Nb‐Si‐Ti系多相金属間化合物基合金の微細組織と機械的性質
関戸信彰, 木村好里, 三浦誠司, 三島良直
日本金属学会講演概要, 1999年03月29日, 日本語

Mo‐Al‐Ti₃元系合金の共析変態過程と機械的性質
新野力也, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1999年03月29日, 日本語

Rh基L1₂型金属間化合物における強度の温度および組成依存性
本間圭一, 寺田芳弘, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1998年09月, 日本語

Nb添加MoSi₂のC40→C11b相変態
福井俊彦, 上野俊吉, 田中良平, 三浦誠司, 三島良直
日本金属学会講演概要, 1998年09月, 日本語

Ti‐Al系金属間化合物の熱伝導率に及ぼす組成と温度の影響
松本亮, 寺田芳弘, 大久保賢二, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1998年09月, 日本語

Nb‐Si‐Ti系における(Nb)/(Nb,Ti)₅Si₃ラメラー組織の形成に及ぼす組成ならびに熱処理条件の検討
関戸信彰, 木村好里, 三浦誠司, 三島良直
日本金属学会講演概要, 1998年09月, 日本語

Ni‐Al‐X(X;Mo,W)三元系平衡状態図のγ相/液相平衡
山田智, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1998年09月, 日本語

Nb/Nb₅Si₃共析組織に及ぼす添加元素及び熱処理条件の影響
佐伯泰彦, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1998年09月, 日本語

変態点における擬臨界減速現象
毛利哲雄, 永田史樹, 三浦誠司
日本金属学会講演概要, 1998年09月, 日本語

Fe‐Si基金属間化合物の(α+ε)相→β相変態と熱電特性の経時変化
新藤健太郎, 太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1998年09月, 日本語

MoSi₂‐Mo₅Si₃共晶材の組織および硬さにおよぼすNb,Vの影響
福井俊彦, 上野俊吉, 田中良平, 三浦誠司, 三島良直
日本金属学会講演概要, 1998年09月, 日本語

遷移金属シリサイドの熱電特性に及ぼす合金化学的因子に関する考察
太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1998年09月, 日本語

Mo‐Al基合金におけるラメラ組織形状への熱処理温度および時間の影響
新野力也, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1998年09月, 日本語

多元系状態図の幾何学的取り扱い
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1998年09月, 日本語

第三元素添加によるCrSi₂の熱電特性の向上
浅川修治, 太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1998年03月, 日本語

Mo‐Al‐X系金属間化合物における共析組織形成と機械的性質
新野力也, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1998年03月, 日本語

Ni‐AlおよびNi‐Ga系金属間化合物の第3元素添加に伴う熱伝導率変化
寺田芳弘, 大久保賢二, 三浦誠司, 毛利哲雄, 鈴木朝夫
日本金属学会講演概要, 1998年03月, 日本語

Rh基2元系金属間化合物の熱膨張特性
本間孝義, 寺田芳弘, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1998年03月, 日本語

3元系状態図決定支援アルゴリズムの3元化合物を含む系への拡張
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1998年03月, 日本語

Co₃AlC強化Co基一方向凝固合金の引張特性およびクリープ破断特性
石橋良, 土井裕之, 中村重義, 三浦誠司, 三島良直
日本金属学会講演概要, 1998年03月, 日本語

Perovskite型金属間化合物Co₃AlC_x(κ‐相)の結晶構造
黄金えん, い富高, 三浦誠司, 三島良直
日本金属学会講演概要, 1998年03月, 日本語

Gruneisen Parameters in Intermetallic Compounds NiAl and Ni₃Al　　　　　　　　　　　　　　　
The 1998 International Symp. on Advanced Energy Technology Proceedings, 1998年

Nb‐Si‐Ti三元系における(Nb)/Nb₅Si₃合金の組織制御
関戸信彰, 三浦誠司, 三島良直
日本金属学会講演概要, 1997年09月, 日本語

高温安定MoAl相の相分離による組織変化
新野力也, 三浦誠司, 毛利哲雄
日本金属学会講演概要, 1997年09月, 日本語

Cu添加したFeSi₂基金属間化合物の金属‐半導体遷移にともなう熱電特性の変化
新藤健太郎, 太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1997年09月, 日本語

Co‐Al‐C3元系(Co)/E2₁基多相合金の機械的性質
黄金えん, 三浦誠司, 三島良直
日本金属学会講演概要, 1997年09月, 日本語

Ni‐XAl‐8Mo(X=20~24)におけるγ′/α基多相金属間化合物の組織制御
獅々堀明, 三浦誠司, 三島良直
日本金属学会講演概要, 1997年09月, 日本語

Fe‐Ni‐Al3元系における反応焼結経路の生成液相量への影響
三浦誠司, 大橋知範, 三島良直
日本金属学会講演概要, 1997年09月, 日本語

素粉末焼結したFeSi₂熱電半導体の評価
太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1997年09月, 日本語

Cr‐X‐Si3元系シリサイトの熱電能に及ぼす添加元素Xの影響
浅川修治, 太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1997年09月, 日本語

Nb‐Cr‐Si 3元系シリサイドの熱電能に及ぼす組成の影響
浅川修治, 太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1997年03月, 日本語

Ni‐Al‐Mo3元系におけるγ′/α基多相金属間化合物の組織と機械的性質
獅々堀明, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年09月, 日本語

Co‐Al‐C系多相合金中のκ(Co₃AlC)相の格子定数の第4元素添加による変化
黄金えん, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年09月, 日本語

種々の遷移金属元素を添加したCoSi 3元系金属間化合物の固溶限と熱電特性
ひつ間章好, 太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年09月, 日本語

Ni₃(Al,Ta)単結晶の高温クリープ強度の方位依存性と内部応力との関係
ほう芝倫, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年09月, 日本語

CoBe/Co₃TiおよびBe₁₇Ti₂/TiAl2相合金の機械的性質と組織
山内亮, 松下正己, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年09月, 日本語

素粉末焼結したFeSi₂の熱電特性におよぼす添加元素の影響
太田順子, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年09月, 日本語

Ti基,Fe基等のアルミナイドの燃焼合成時に発生する液相量の予測とち密化への影響
大橋知範, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年09月, 日本語

3元系状態図決定支援アルゴリズム構築の試み
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1996年03月, 日本語

Ni₃(Al,Ta)単結晶の高温クリープ強度の方位依存性
ほう芝倫, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年03月, 日本語

数種の金属間化合物の燃焼合成において発生する液相量の予測
大橋知範, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年03月, 日本語

B2 CoBe/Ll₂Co₃Ti 2相合金の組織と機械的性質
山内亮, 松下正己, 三浦誠司, 三島良直
日本金属学会講演概要, 1996年03月, 日本語

FeSi₂基金属間化合物の素粉末焼結
太田順子, ひつ間章好, 三浦誠司, 三島良直
日本金属学会講演概要, 1995年04月, 日本語

12Cr系耐熱鋼の焼戻脆性に及ぼすMo添加量の影響
松永孝, 篠田哲守, 三浦誠司, 三島良直
日本金属学会講演概要, 1995年04月, 日本語

Ni₃Al単結晶の高温クリープ強度に対するTa,W複合添加の効果
ぼう芝倫, 三浦誠司, 三島良直
日本金属学会講演概要, 1995年04月, 日本語

(Co)/CoBe2相合金の熱処理と組織変化
松下正己, 三浦誠司, 三島良直
日本金属学会講演概要, 1995年04月, 日本語

Co‐Al‐C系金属間化合物Co₃AlC(κ相)の相領域と機械的性質
黄金えん, 三浦誠司, 三島良直
日本金属学会講演概要, 1995年04月, 日本語

Co‐Al‐Ni‐Ti4元系B2/L1₂基多相合金の引張特性
木村好里, 三島良直, LIU C T, 三浦誠司
日本金属学会講演概要, 1995年04月, 日本語

Ni‐(21~27)at%Al二元合金の延性とboron添加の影響
い富高, 三浦誠司, 三島良直
日本金属学会講演概要, 1995年04月, 日本語

Co‐Al‐C3元系B2/E2₁基多相合金の引張特性
木村好里, 三島良直, LIU C T, 三浦誠司
日本金属学会講演概要, 1995年04月, 日本語

三元組成Ni₃Al単結晶・多結晶の熱伝導率
寺田芳弘, 毛利哲雄, 鈴木朝夫, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年10月, 日本語

Fe‐Be‐Cr合金におけるBe基金属間化合物の析出
松下正己, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年10月, 日本語

Ni‐Al2元系におけるL1₂Ni₃Al安定組成領域に及ぼすB添加の影響
い富高, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年10月, 日本語

Ti‐Al2元系TiAl/Al₃Tiの高温相平衡におよぼすMo添加の影響
金星録, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年10月, 日本語

(B2 CoAl‐E2₁ Co₃AlC)基多相合金の相安定性と機械的性質
木村好里, 高橋勝, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年10月, 日本語

液体急冷したNi₃Al合金の凝固組織とAPDの形態
三井和博, 高橋正雄, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年10月, 日本語

L1₂型Ni₃(Al,Be)基多相合金の相安定性と機械的性質
松尾貴寛, 細田秀樹, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年10月, 日本語

Co‐Al‐Ni‐Ti4元系に存在する金属間化合物の相安定性と機械的性質
俣野岳生, 木村好里, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年10月, 日本語

Ni‐Al‐X3元系におけるγ相の固相面及び液相面の決定
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1994年03月, 日本語

Fe‐Be‐Cr3元系状態図の実験的検討
松下正己, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年03月, 日本語

Ni‐rich側のNi‐Al状態図の再検討
い富高, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年03月, 日本語

第三元素微量添加NiAl合金の鍛造性ならびにスウェージング材の機械的特性
石山新太郎, 衛藤基邦, 三島良直, 三浦誠司, 鈴木朝夫
日本金属学会講演概要, 1994年03月, 日本語

NiAlスウェージング材の機械的特性に及ぼすVI A属金属元素の影響
石山新太郎, 衛藤基邦, 三島良直, 三浦誠司, 鈴木朝夫
日本金属学会講演概要, 1994年03月, 日本語

L1₂型金属間化合物Ni₃(Al,X)単結晶の高温クリープ挙動
こ芝倫, 三浦誠司, 三島良直
日本金属学会講演概要, 1994年03月, 日本語

NiAlスウェージング材の機械的特性に及ぼすボロン元素の影響
石山新太郎, 衛藤基邦, 三島良直, 三浦誠司, 鈴木朝夫
日本金属学会講演概要, 1994年03月, 日本語

NiBeおよびCoBe2元合金の熱処理と硬さ
松下正己, 三浦誠司, 鈴木朝夫, 三島良直
日本熱処理技術協会講演大会講演概要集, 1993年11月, 日本語

(Co)/CoBe2相合金の機械的性質に及ぼす時効の影響
松下正己, 三浦誠司, 鈴木朝夫, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

B2型CoAl基多相合金の組織制御と延性
木村好里, 三浦誠司, 鈴木朝夫, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

Ni‐Al‐Be3元系のNi側状態図
松尾貴寛, 細田秀樹, 三浦誠司, 鈴木朝夫, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

E2₁型金属間化合物Co₃AlCを分散相とするCo基耐熱合金の設計
細田秀樹, 高橋勝, 三浦誠司, 中村重義, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

液体急冷したNi₃Al合金における逆位相領域の形成過程
三井和博, 高橋正雄, 三浦誠司, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

化学量論組成からのずれを考慮したL1₂Ni₃Al/B2 NiBe複合組織金属間化合物の合金設計
細田秀樹, 松尾貴寛, 三浦誠司, 鈴木朝夫, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

Co‐Al‐C3元系におけるα,β’およびκ相関の相平衡
高橋勝, 木村好里, 三浦誠司, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

L1₂型(Al,Cr)₃Ti基多相金属間化合物の機械的性質
朴政容, い当文, 三浦誠司, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

Co‐Al‐Ti4元系におけるB2/L1₂相平衡
俣野岳生, 木村好里, 三浦誠司, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

Ti‐Al‐Nb3元系合金の2相領域(TiAl/Al₃Ti)における高温相平衡
金星録, 三浦誠司, さいせん川, 三島良直
日本金属学会講演概要, 1993年09月, 日本語

Ni₃(Al,5Ti)単結晶の(001)すべりの転位組織に及ぼす温度および歪速度の影響
三浦誠司, 三島良直, HORTON J A, YOO M H, 鈴木朝夫
日本金属学会講演概要, 1993年09月, 日本語

B2 CoAl基多相合金の組織と機械的性質
木村好里, 三浦誠司, 鈴木朝夫, 三島良直
日本金属学会講演概要, 1993年03月, 日本語

Ll₂型金属間化合物(Co,Fe)₃VおよびCo₃Tiの高温における環境脆化
三浦誠司, LIU C T
日本金属学会講演概要, 1993年03月, 日本語

Ni₃(Al,Si)単結晶の塑性変形に及ぼす予歪の影響
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1993年03月, 日本語

Ni‐Al金属間化合物の反応焼結に及ぼす組成と試験片寸法の効果
三浦誠司, LIU C T
日本金属学会講演概要, 1993年03月, 日本語

Ti‐Al‐X3元合金のγ/α₂平衡とα₂相の機械的性質
小針英亮, 小林郁夫, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1992年09月, 日本語

γ単相TiAlの強さの温度依存性に及ぼす第3添加元素(Nb,Cr,V)の影響
新本浩一郎, 小林郁夫, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1992年09月, 日本語

γ単相TiAl合金の機械的性質とCr添加の影響
新本浩一郎, 小林郁夫, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1991年09月, 日本語

(Fe,Ni)Al+0.05wt%B金属間化合物の高温クリープ特性
たん毅, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1991年09月, 日本語

単相及び二相組織のB2型金属間化合物CoAlの機械的性質
栗山春宣, 三浦誠司, 三島良直, 加藤雅治, 鈴木朝夫
日本金属学会講演概要, 1991年09月, 日本語

(Ti,Nb)Al 3元合金の機械的性質の温度および組成依存性
小林郁夫, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1991年09月, 日本語

ハンマーアンビル法で急冷凝固したTi‐rich TiAl系合金のTEM組織
小針英亮, 小林郁夫, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1991年09月, 日本語

Ni₃Ge単結晶の機械的性質
小池基行, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1991年09月, 日本語

Ni₃Al単結晶の高温クリープ特性におよぼす第3添加元素ならびに結晶方位の影響
良藤英明, 竹川光弘, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1991年09月, 日本語

非化学量論組成における金属間化合物のAPBエネルギーの予測 主としてB2,Ll₀,Ll₂型について
細田秀樹, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1991年03月, 日本語

Ni₃(Al,X)単結晶の引張ならびに圧縮クリープ挙動の比較
三浦誠司, 竹川光弘, 林透, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1991年03月, 日本語

[001]方位のNi₃(Al,2Hf)単結晶の高温引張クリープ特性
三島良直, 竹川光弘, 林透, 三浦誠司, 安田健, 吉成明, 鈴木朝夫
日本金属学会講演概要, 1991年03月, 日本語

特集 金属間化合物―新しい構造用材料としての展開 高温におけるNi₃(Al,X)単結晶の塑性変形挙動
三島良直, 三浦誠司, 鈴木朝夫
日本金属学会会報, 1991年01月, 日本語

Ni₃(Al,Si)単結晶における低温での前歪の高温変形におよぼす影響
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1990年09月, 日本語

4B亜族元素をXとするNi₃X単結晶の流動応力の方位および温度依存性
小池基行, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1990年09月, 日本語

Ll₂型金属間化合物Ni₃Al‐4Cr単結晶の塑性変形挙動
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1990年09月, 日本語

L1₂型金属間化合物(Co,Ni)₃(Ti,Al)単結晶の塑性変形挙動
栗山春宣, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1990年09月, 日本語

ハンマーアンビル法による金属間化合物TiAlの超急冷組織
小林郁夫, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1990年09月, 日本語

Ti,Cr,Siを含むNi₃Al単結晶の高温クリープ挙動
竹川光弘, 林透, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1990年09月, 日本語

低温域におけるNi₃(Al,4Hf)単結晶の強さの方位依存性
三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1990年09月, 日本語

L1₂型金属間化合物Ni₃(Si,Ti)単結晶の高温変形挙動
小池基行, 三浦誠司, 三島良直, 鈴木朝夫
日本金属学会講演概要, 1989年09月, 日本語

物質理工学特論第４「合金状態図」　　　　　　　　　　　　　　　
九州大学

強度設計学特論　　　　　　　　　　　　　　　
北海道大学大学院工学研究院

強度設計学　　　　　　　　　　　　　　　
北海道大学工学部

強度物性学　　　　　　　　　　　　　　　
北海道大学工学部

ミルフィーユ構造の材料科学（研究に関する総括）
科学研究費助成事業 新学術領域研究(研究領域提案型)
2018年06月29日 - 2023年03月31日
阿部 英司, 中島 英治, 河村 能人, 相澤 一也, 藤居 俊之, 斎藤 拓, 山崎 倫昭, 染川 英俊, 萩原 幸司, 君塚 肇, 三浦 誠司, 伊藤 浩志, 榎 学, 寺田 大将, Stefanus Harjo
本総括班の目的は，ミルフィーユ構造のキンク強化理論の確立と新材料創製を目指して，司令塔として領域研究の組織的かつ有機的な運営を実施することである．初年度の主な実績は以下の通りである．
(1) より効率的な領域運営のため，総括班体制を一部修正し，スリム化を図った．(2) 領域キックオフ会議，および年度成果報告会を企画・開催し，領域内での研究活性化と，研究者間の連携強化に努めた．(3) 異分野間の連携強化のため，各計画研究班内，および各計画研究班間の勉強会や研究会を積極的に企画・開催した．(4) 学協会におけるシンポジウムを複数企画し，研究成果の発信に務めた．(5) 広報活動の一環として，本新学術の内容紹介リーフレット，および第１号ニュースレターを刊行し，各学協会や各大学・研究機関に配布した，リーフレット配布は公募研究募集に非常に有効であった．(6) 知的財産の重要性認識のため，領域メンバーを対象として特許専門家による講演会を実施し，特許申請を促した，(7) 若手人材育成部会が中心となり，大学院生・若手研究者を主体とする合宿研究会を企画・開催した.(8) 研究活動支援部会より，Mg合金系の共通試料の提供を開始した，(9) 領域研究のホームページを立ち上げ，領域研究内容の情報発信に務めた．(10) 本新学術が主催する国際会議を企画・開催し，海外の評価委員数名を含めて本新学術の方向性の議論を深めた．
日本学術振興会, 新学術領域研究(研究領域提案型), 東京大学, 18H05475

新規金属・高分子系ミルフィーユ構造の構造制御と物質創製
科学研究費助成事業 新学術領域研究(研究領域提案型)
2018年06月29日 - 2023年03月31日
三浦 誠司, 江村 聡, 藪 浩, 斎藤 拓
ミルフィーユ構造物質（MFS）を下記(a)-(c)の三種類に区分し、物質探索を行った。 (a) 結晶構造型MFSはLPSO相、MAX相、高分子系を含み、典型的層間隔はnmオーダーである。 (b)組織制御型MFSはAl基やTi基などの二相合金を含み、典型的層間隔はμｍオーダーである。 (c)ハイブリッド型MFSはLPSO―Mg合金、V-V2AlC合金などを含み、組織制御型MFSの構成相の一方が結晶構造型MFSである物質と定義した。
これらに関して下記のような研究展開が得られており、既に論文、特許などへの展開が進行中である。
（１）金属系MFSの創製：(1-1) Al-Ag系やNi-Sn合金において，面心立方構造と六方最密構造の二相が共通のすべり面を持つことから，ミルフィーユ構造を実現できる合金系が見出された。(1-2) ミルフィーユ構造を持つTi-Cr系合金について圧縮試験や冷間圧延によってキンク変形が導入されることを見いだした。
（２）高分子系MFSの創製：(2-1)高分子膜上にシリカ前駆体を塗布し、UV-O3処理で高分子ーシリカ積層ミルフィーユ構造の作製に成功した。高分子ーシリカ複合体をMg蒸気中で処理することで、Mg2Siとカーボンの積層構造が形成できることも明らかとした。ブロック共重合体から形成したミルフィーユ構造に圧縮を加えることでキンク状構造を導入できることが明らかとなった。特殊な蛍光プローブを分子内に導入し、力学強度を可視化する高分子合成に成功した。(2-2) 結晶性高分子のポリエチレンに対して配向制御法を駆使して巨視的なミルフィーユ構造を形成させることで、降伏を抑制して著しく高強度化できることを見出した。
（３）セラミックス系MFSの創製：MAX相を金属母相と組み合わせたMFS（V-V2AlC）において、添加元素による積層界面安定化効果が明らかとなった。
日本学術振興会, 新学術領域研究(研究領域提案型), 北海道大学, 18H05482

顕微インデンテーション開発展開と多相合金破壊挙動の直接観察による組織設計原理確立
科学研究費助成事業
2019年04月01日 - 2022年03月31日
三浦 誠司
本研究では、脆性相-延性相からなる多相合金の破壊挙動理解を目指す。亀裂進展の情報を簡便に取得するために、透明ダイヤモンド圧子押し込み時の試料の変形・亀裂進展を「その場観察」する装置（顕微インデンタ）を用いて、時間経過に伴う変形・亀裂進展挙動を詳細に追跡する。
亀裂観察のために稜部分を研削し観察窓とした改良型ビッカース圧子を作製し、動画と荷重-変位曲線から亀裂進展と荷重の関係を抽出し、表面組織観察結果と組み合わせて、破壊挙動の情報化を進められることを明らかにした。
日本学術振興会, 基盤研究(C), 北海道大学, 19K05026

粒界性格と粒界偏析量を制御した双結晶作製手法の開発と粒界諸特性の解明
科学研究費助成事業
2016年04月01日 - 2020年03月31日
池田 賢一, 三浦 誠司, 滝沢 聡
本研究は、粒界偏析・粒内固溶元素が個々の粒界の力学特性や再結晶挙動に与える影響を系統的に明らかにするために、新たな双結晶作製手法の開発と多結晶における粒界が関与する諸特性を評価し、以下の成果が得られた。
(1)ブリッジマン法に適した双結晶モールドを設計・製作し、純アルミニウムの双結晶作製に成功した。(2)Al-Mn合金の析出・再結晶挙動は、熱間加工プロセス温度と微量添加元素に強く影響を受けることを明らかにした。(3)Al-Mg-Si合金では、粒内固溶元素が関与する析出挙動において、粒界性格が影響を及ぼしてその力学特性が変化することを明らかにした。
日本学術振興会, 基盤研究(B), 北海道大学, 16H04502

原子間結合エネルギー解析によるシンクロ型ＬＰＳＯ構造形成メカニズム解明
科学研究費助成事業 新学術領域研究(研究領域提案型)
2011年04月01日 - 2016年03月31日
奥田 浩司, 飯久保 智, 三浦 誠司, 大谷 博司, 大出 真知子, 徳永 辰也
複雑な構造を形成するMg合金であるMg-Y-Znを典型とする長周期積層秩序構造（LPSOStructure)の形成原理や形成条件、安定性など、材料設計や熱処理設計に不可欠な材料学的基盤を確立することを目的に、状態図(安定性）と相変態（動力学）の両面から、計算科学的手法と放射光を使ったその場測定法により研究を進めた。
成果として多様な周期をとる複雑なLPSOが相として定義可能なものであり、その形成過程(相転移過程）は相分離が引き金となって構造相転移を起こす（MgYZn)ことを明らかにした。
日本学術振興会, 新学術領域研究(研究領域提案型), 京都大学, 23109005

耐火金属基BCC高濃度固溶体をベースとした超耐熱材料創成　　　　　　　　　　　　　　　
ALCA
2014年10月
三浦 誠司
国立研究開発法人 科学技術振興機構, 研究代表者, 競争的資金

異種金属繰返し多層めっきによる高強度１次元ナノ構造バルク材の作製と物性理解
科学研究費補助金(挑戦的萌芽研究)
2011年 - 2013年
三浦 誠司, 坂入 正敏
本研究は、従来手法ではサイズや試料強度の上限や微細化の下限に阻まれるナノ構造バルク材の新たな作製法の展開を目指し、微細構造を積み上げるボトムアップ型プロセスとしての「めっき」を利用したプロセスの検討を行う。すなわち、転位運動を阻むレイヤーを板状試料表面に平行かつ周期的に導入することで、めっきにより作製した層内での転位運動の効果的な抑制が期待できる。このような１次元的変調構造を実現した高強度ナノバルク板材の作製手法確立を目指すとともに、その機械的性質の支配因子を理解することを目的とする。 初年度は以下の二項目を実施した。(1) 「自動ナノ厚さ多層めっきバルク作製装置」の開発(2) 多層めっきバルク材を実現し、その機械的性質の根源を追求する。 多軸ステージおよび位置制御装置コントローラで試料位置を制御し、温度制御水槽内に設置した二種類のめっき浴に試料を順次浸漬し、関数発生器で制御したポテンショスタットによって膜厚、組織を制御する、「自動ナノ厚さ多層めっきバルク作製装置」を開発した。４時間の自動運転で90層の多層めっき作製に成功した。試作したCu/Ni 多層めっきのGD-OES 分析結果から、表面から奥行き方向にナノ厚さのめっき層が交互に作製できていることが確認した。ナノインデンテーションなど硬さ試験の実験条件を確立し、熱処理等と組み合わせた物性変化の研究を開始した。
文部科学省, 挑戦的萌芽研究, 北海道大学, 研究代表者, 競争的資金, 23656443

液中プラズマ放電による合金ナノボールの創製と機能性発現のための物性測定
科学研究費助成事業
2008年 - 2010年
渡辺 精一, 保田 英洋, 庭瀬 敬右, 西口 規彦, 大笹 憲一, 三浦 誠司, 坂口 紀史, 谷津 茂男, 黒川 一哉, 秋山 友宏, 安住 和久
本研究は, 申請代表者らが開発したグロー放電による液中プラズマ利用の新規金属ナノボールの製法を活用し,各種金属と合金材料を出発原料としたナノボール創製研究と機能物性発現の物性解析評価,および作製したナノ粒子を利用した新規機能デバイス材料の開発基礎のための材料設計を行なった.
日本学術振興会, 基盤研究(A), 北海道大学, 20246094

超高速一方向共晶凝固と共析分解・球状化熱処理による高靭性耐熱ニオブ基合金の実現
科学研究費補助金(基盤研究(A))
2007年 - 2009年
三浦 誠司, 木村 好里, 毛利 哲夫, 渡辺 精一, 大笹 憲一, 三島 良直, 滝沢 聡, 木村 好里
凝固速度1500mm/hで高速一方向凝固したNb-18.1Si-1.5Zr合金を熱処理したところ、所期の金属組織が得られた。Nb相の3Dイメージングより、高温材料として有利な巨大サイズNb結晶粒実現が示唆された。この試料は室温で2%の圧縮塑性変形能を示し、50kgでダイヤモンド圧子を押し込んでも、脆い強化相Nb_5Si_3の破壊は周囲の延性Nb母相が抑制する。高温変形特性を決めるNb相の高温強度を向上させるMo、W添加は、Ta添加と組み合わせると組織制御と高強度化を同時に達成できる。
文部科学省, 基盤研究(A), 北海道大学, 研究代表者, 競争的資金, 19206071

高速加熱過程における規則相の相安定性
科学研究費助成事業
2001年 - 2003年
毛利 哲夫, 三浦 誠司
急冷処理によって高温相を凍結することは材料研究における常套手段であり、相変態のメカニズムを解明したり、準安定相の機能や物性の発現手段として頻繁に用いられている.これに対して本研究で目的としたのは、逆に、低温規則相の高速加熱によって、規則相の相安定性や不規則化にともなう相変態のkineticsの詳細を実験・理論計算の双方から検討することである.特に、(1)低温規則相を高速加熱により不規則相領域にもちきたしたときの、核生成による不規則化と自発的不規則化(スピノーダル・ディスオーダリング)の相違の検討と、(2)規則相の急熱による変態温度以上への過熱に際して、加熱速度を速くすればする程、変態温度の過熱度が低下する逆現象(Retro効果)の理論及び実験的検証に焦点をおいた.
理論的には、均一系を対象にした経路確率法-クラスター変分法に基づく低温不規則相の急速過熱シミュレーションの計算を行い、核発生-成長に基づく変態と、安定性の破れに基づく自発的な変態(但し、一次変態である.)の二種類があることを予測し、Phase Field法を援用することでAPBの生成過程の詳細を論じた.さらに、電子論計算と組み合わせて、Fe-Pd系の変態動力学を第一原理から算出した.実験的には、Ni-Mo系を対象に電気抵抗の測定と熱分析を行い、共に、急速加熱時の変態点の異常を認めた.又、レーザー顕微鏡を併用して、相変態時の表面起伏観察を行った.Retro効果は単結晶では出現せず多結晶のみに限定されていること、これが、変態時の内部応力の発生と関連していることなどを明らかにした.
日本学術振興会, 基盤研究(A), 北海道大学, 13305043

Thermal expansion measurement of micron size small spesimens　　　　　　　　　　　　　　　
2002年
競争的資金

相分解反応を利用した組織微細化による耐熱金属間化合物の延性改善
科学研究費助成事業
1996年 - 1997年
三島 良直, 三浦 誠司
本研究ではNi-Al-Mo系において高融点金属であるMoが、NiAl(β)相の相分解やNi_3Al(γ')相からの析出、共晶反応等によって現れると推測される領域があることに着目し、凝固過程を利用したγ'相中にMo(α)相の微細分散を図り高融点・高延性・低比重の、実用Ni基超合金に対して十分競合できる合金を設計することを目的として3元系状態図を調べると共にγ'/α2相合金の相安定性と機械的性質に関する研究を行った。相安定性の評価においては、熱処理前後の試料において組織観察及びDTAにより組織の形成過程と状態図の縦断面図の推測を行った結果、目標とした組成領域での熱処理後の組織ではγ'/α2相となり、さらにγ'相はα相の微細析出物を内在していた。不変系反応温度近辺で形成されたと考えられるα相の微細析出物は、1200℃で24時間の熱処理においても、長さが1μm程度にしか粗大化せず、微細な形状を保っていた。このようなγ'/α2相合金の高温強度や室温延性を調べた結果、1200℃程度までの温度範囲における材料として考えるならば、最適条件の組成の選択や作製プロセス等を組み合わせることにより、実用Ni基超合金を上回る性能を示す材料となる可能性を有していることが確認できた。
日本学術振興会, 基盤研究(B), 東京工業大学, 08455318

3元系状態図決定支援アルゴリズム構築の試み
科学研究費補助金(奨励研究(A))
1996年 - 1996年
三浦 誠司
本研究では、相の関係や不変形反応相互の関係を整理・分類し、場合分けを行うことにより、3元系状態図について半自動的な決定や、既往の状態図のチェックが可能なアルゴリズムの構築を目指した。具体的には、3元系状態図が3相三角形によって分割されていることから、これを相の数と等しい角数の多角形に変換し、その多角形を三角形で分割する。固相から成る3相三角形は必ず4相平衡と対応しており、液相の関与した3種類の3相平衡がある温度で合する。それら3種類の3相平衡は2元系の共・包晶を始点もしくは終点としており、液相の組成の温度による変化を示した線により表すことができる。4相平衡も同様に液相の組成変化を表す線の結合によって表すことができるが、これらの線の連結はグラフ理論により隣接行列として記述できる。あり得る三角形分割および各平衡の温度の上下関係は行列式を簡単な手順で操作することで列挙できる。さらに、隣接行列の演算により、すべての3および4相平衡点の関係、すなわち温度の上下関係を記述でき、その上下関係を既往のデータと比較することにより、あり得ない組合せを排除することができる。本研究では3元化合物の存在しない系について、(1)既知の2元系状態図から、あり得る反応経路図を列挙し、(2)状態図に関する実験的研究結果・熱力学的計算結果などから得られる限定条件を盛り込むことにより、反応経路図を絞り込む、という、今後の拡張のための原型となるアルゴリズムを実現した。組合せ総数は相の数が8程度と比較的少ない場合でも100万通りを越すことから、大量のデータを迅速に処理し、かつ保存できる必要があると同時に、アルゴリズム上の工夫によって全てを計算し照合するのではなく、ある程度実験結果から計算条件を限定することを行った。これにより、計算総数を大幅に圧縮することが可能となり、最適の場合2桁もの減少が見込める。
文部科学省, 奨励研究(A), 東京工業大学, 研究代表者, 競争的資金, 08750765

マグネシウム合金単結晶及び複合材料の変形挙動　　　　　　　　　　　　　　　
民間学術研究振興費補助金
1996年
競争的資金

mechanical properties of Mg-based alloys　　　　　　　　　　　　　　　
Grant-in-Aid for Promotion of Private Scientific Research
1996年
競争的資金

Improvement of mechanical properties of Nb-Si based intermetallic compound-based materials by microstructure control　　　　　　　　　　　　　　　
Grant-in-Aid for Scientific Research
1995年
競争的資金

B2型金属間化合物NiBeとCoBeの組織制御による延性改善
科学研究費助成事業
1994年 - 1994年
三島 良直, 三浦 誠司
金属元素の中で最も軽量であるベリリウムを構成元素とする金属間化合物の中で、その規則構造の対称性が最も高く、よって室温での塑性変形能が期待できる
NiBeとCoBeを対象として、それぞれの構成元素による2元系Ni-Be、Co-Be状態図上で隣接するNiあるいはCo1次固容体相(以後、(Ni)あるいは(Co)と表記)との複合組織化により機械的性質の改善を試みた。その結果、NiBe/(Ni)1次固容体の2相合金は(Ni)相の微細分散により550K付近で著しく高い強度を示すものの、その強度は試験温度上昇とともに急激に低下してしまうこと、また室温付近ではほとんど延性を示さないことが明らかとなった。一方、CoBe/(Co)合金においては、数種の異なる合金組成においてすべて室温から高温まで良好な延性を示すことが見いだされた。また、この合金は中音度域で強さの逆温度依存性を示したが、これはL1_2型金属間化合物を代表とする一群の化合物にみられる転位の熱活性化運動による可逆的な過程によるものとは異なり、機械試験中に起こる組織変化によって生じる非可逆的な現象であることを示した。
本研究の結果、特にCoBe/(Co)2相合金においては良好な室温延性がえられることから構造用金属間化合物としての応用への可能性があることが明らかとなったが、今回の実験範囲では1000℃での高温強度は低く、室温延性を損なわずに高温強度を高めるためのさらなる合金設計が必要であると考えられる。
日本学術振興会, 重点領域研究, 東京工業大学, 06215213

Ni_3A1+Hf金属間化合物単結晶タービンブレ-ドの合金設計と試作
科学研究費助成事業
1993年 - 1994年
三島 良直, 安田 健, 三浦 誠司
実用Ni基超合金の性能を超える新しい耐熱構造用材料の候補として金属間化合物Ni_3A1が挙げられるが、その多結晶合金は粒界脆性を示し、その克服にむけて多くの研究がなされている。本研究では粒界脆性の危惧のない単結晶Ni_3A1を対象とし、その高温強度をいかにして高めるかという観点からの合金設計を目的として平成5年度より2年間にわたって行った。
初年度においては研究代表者ならびに分担者によってこの目的に有効な添加元素であることが見いだされているHfの添加量、ならびに単結晶の結晶方位が高温クリープ抵抗におよぼす影響を検討し、さらにHfとならぶ耐火金属元素であるW、Nb、Taなどの添加の効果についても系統的な研究を行った。定常クリープ速度、応力指数、拡散クリープにおける活性化エネルギーの大小等の比較を行った結果、これら元素のクリープ抵抗の増加への寄与の順列を見いだすとともに、単結晶Ni_3A1のクリープ強度が従来いわれている(001)方位ではなく、(011)方位で最も高い場合があることを見いだした。また、次年度ではこれら元素の複合添加の効果を結晶方位の影響とともに調べ、(011)方位の単結晶における複合添加の有効性を定量的に示すことが出来た。
日本学術振興会, 試験研究(B), 東京工業大学, 05555183

E2_1型金属間化合物Co_3AlCを析出相としたCo基耐熱合金の合金設計
科学研究費助成事業
1993年 - 1993年
三島 良直, 三浦 誠司
本研究の目的は、現在のNi基実用耐熱合金におけるLl_2型金属間化合物Ni_3Al析出相に対応する析出相をCo基耐熱合金に導入することで、より優れた耐熱性を付与することである。
高融点の析出相として主にCo基合金に導入を図ったのは、E2_1型金属間化合物Co_3AlCで、Ni基耐熱合金の析出強化相Ni_3Alの結晶構造であるLl_2型規則構造に炭素(C)が侵入した形態を有している。Co-Al-C系の状態図は不確定であったため、まずCo近傍のCo-Al-C三元状態図を確定することに努めた。Ar雰囲気中で非消耗型アーク溶解装置によって種々の合金を溶製し、X線、示差熱分析、光学顕微鏡等による組織観察などを行い、既存の状態図に修正を施した。修正した状態図に基づいていくつかの合金を選定し、その高温変形強度を測定した。また、隣接相であるB2型金属間化合物CoAlも同時に導入を試み、Co-Co_3AlC2相及びCo-Co_3AlC-CoAl3相合金の比較も行った。その結果、B2型金属間化合物CoAlを含むものは、必然的にAl量も多く、耐酸化性、比重などの点で有利と考えられるが、高温における強度の点では2相合金の方が有望であることが判明した。修正した状態図から、Co合金中のCo_3AlC量はNi基超合金中におけるNi_3Alほど多くすることは困難であると考えられるが、わずかな量のCo_3AlCをCoに導入することで、Ni基超合金に比肩する高温強度を得ることができる可能性が示された。
さらに、いくつかの合金については室温大気中で圧延を試みた。その結果、いくつかの組成で、10%以上の圧延が可能であった。
日本学術振興会, 重点領域研究, 東京工業大学, 05223217

Ll_0型金属間化合物TiAlのDO_<22>型金属間化合物Al_3Ti析出による組織制御
科学研究費助成事業
1993年 - 1993年
加藤 雅治, 三浦 誠司, 三島 良直
本研究の目的は、次世代の高温耐熱構造用材料として期待されているLl_0型金属間化合物TiAlに、同じ面心立方構造を基本構造としていて、その格子定数やその比であるc/aも近い、Al-rich側に存在するDO_<22>型金属間化合物Al_3Tiを整合、もしくは半整合析出分散させることで、必ずしも十分な高温変形強度を有しているとはいえないTiAl金属間化合物に対して比強度の高い、効果的な析出強化相を導入する可能性を探ることである。
両相はTi-Al2元系では隣接しないため、本研究ではまずTi-Al-Nb3元系のAlコーナー近傍における相領域や融点、固相反応を明確にした。その結果、広い組成範囲で(Ti,Nb)AlとAl_3(Ti,Nb)は平衡していること、その大部分の領域の初晶はAl_3(Ti,Nb)であることが判明した。また、熱処理により、初晶Al_3(Ti,Nb)および(Ti,Nb)Al両相中に互いが析出することが確認された。このことは、TiAl単相中に、Al_3Tiを析出させ得ることを示唆する。2相領域での硬さ試験を行ったところ、熱処理によって硬さは上昇しているが、上昇量が特に大きい領域があり、その組成は決まったTie-Line上に存在することから、この平衡組成近傍はTiAl、Al_3Tiいずれの単相合金にも熱処理によって第2相を析出させて機械的性質を向上させうる可能性が高いものと考えられる。
日本学術振興会, 重点領域研究, 東京工業大学, 05223216

B2型金属間化合物を主体とする高温構造用材料の合金設計
科学研究費助成事業
1991年 - 1992年
三島 良直, 毛利 哲夫, 三浦 誠司, 加藤 雅治
これまでにCo-A12元系B2/(Co)2相合金で圧縮塑性歪2〜3%,Co-A1-Ni3元系B2/L1_2(Ni_3A1)2相合金で10%以上の延性改善を行った。B2/L1_2相合金では延性と高温強度を同時に改善できる可能性があり,Co-A1-Ni-Ti4元系内でL1_2 Ni_3A1とCo_3Tiの連続固溶体を利用すると,Co高濃度側までB2/L_2多相領域が拡大でき,広い組成範囲での組織制御が可能であると考えた。本年度は,Tiを2.5および5.0at%添加したCo-A1-Ni-Ti4元系B2/L1_2多相合金の組織形態と機械的性質の関係を調べた。
Ti添加量2.5,5.0at%の合金をアーク炉により溶製し,1373K,4h+1173K,24hの均質化熱処理を施した。組織および平衡相を調べるため光学顕微鏡観察,X線回折,示差熱分析を行い,機械的性質を調べるために,硬さ試験,室温から1273Kの温度範囲で圧縮試験を行った。その結果,2.5,5.0at%Ti両合金ともに組織はB2/(Co,Ni)2相,B2/L1_22相,B2/(Co,Ni)/L1_23相と思われる3つのタイプに大別できた。ほぼB2単相のB2/(Co,Ni)2相合金を除く全ての合金で4〜10%の圧縮塑性歪が得られ,L1_22相を含む合金では特に良好な室温延性が達成できた。全ての合金が室温で1000MPa以上の高強度を示し,0.2%変形応力(降伏強度)の温度依存性には,支配的である構成相の特徴が反映されることがわかった。例えば,B2相を多く含む合金では600から800Kの温度域で温度上昇に伴う強度低下が抑制されるB2型特有の温度依存性を示し,また,L1_2相を多量に含む合金ではL1_2相に起因する強度の正の温度依存性の発現によって600から800Kの温度域が最大強度を示した。Ti添加量が強度に与える影響はB2/L1_2相合金で顕著に現れ,Ti添加量を増加させると1073Kまでの温度域で200MPa程度の強度上昇が認められた。すなわち,Co-A1-Ni3元系からCo-A1-Ni-Ti4元系に拡張することでB2/L1_2多相領域がCo高濃度側に拡大でき,良好な延性,高強度を実現できた。
日本学術振興会, 一般研究(B), 東京工業大学, 03452255

液体超急冷した金属間化合物のミクロ組織構造と相安定性
科学研究費助成事業
1989年 - 1991年
鈴木 朝夫, 吉村 昌弘, 三浦 誠司, 三島 良直
本研究のまとめとして,主としてNi_3AlとTiAl を代表する種々の金属間化合物についての液体超急冷実験の成果を要約すると以下のとおりである。
1)TiAlの液体超急冷組織の観察結果から,これまでに明確にされていなかった。TiーAl 2元系平衡状態図におけるαTi相,Ti_3Al相,TiAl相間の相境界関して信頼できる評価を得ることができた。
2)Ni_3Alの液体超急冷組織に出現する準安定相の出現傾向におよぼす第3元素添加の効果を系統的に調べた結果,その出現を抑制する添加元素は同時にNi_3Alの延性を改善する元素であることが明かとなった.この2つの現象がいかなる理由で同時に起こるのかについては不明であるものの金属間化合物の構造用材料としての実用化のネックとなっている延性の欠如を解決する方策の一つとして有用であると考えられる.
日本学術振興会, 一般研究(A), 東京工業大学, 01420041

Experimental study of alloy phase diagrams　　　　　　　　　　　　　　　
1991年
競争的資金

高温におけるクロム添加Ni_3Al金属間化合物単結晶の塑性変形挙動
科学研究費助成事業
1990年 - 1990年
三浦 誠司
日本学術振興会, 奨励研究(A), 東京工業大学, 02750547