1998 Fiscal Year Annual Research Report

変位型相変態の新展開

Research Project

Project/Area Number	09242103
Research Category	Grant-in-Aid for Scientific Research on Priority Areas (A)
Research Institution	University of Tsukuba
Principal Investigator	大塚和弘筑波大学, 物質工学系, 教授 (50029881)
Co-Investigator(Kenkyū-buntansha)	唯木次男大阪女子大学, 学芸学部, 教授 (90029885) 佐分利敏雄大阪大学, 工学部, 教授 (40029020)
Keywords	変位型相変態 / マルテンサイト変態 / 変態前駆現象 / 格子欠陥 / 変態のカイネティクス / 形状記憶合金薄膜 / ナノ粒子 / 格子軟化
Research Abstract	本研究グループで行っている五つのテーマに対し、以下テーマごとに研究成果の概要を記す。 (a) 2次に近い変位型相変態の研究では、Ti-Ni、Ti-Ni-Fe、Ti-Ni-Cu合金の弾性定数の温度依存性を系統的に測定し、弾性定数c'、c_<44>及び弾性異方性A=c_<44>/c'の温度依存性からTi-Ni合金特有のmonoclinicマルテンサイト生成の原因を明らかにすることができた。 (b) 変位型1次相変態と格子欠陥の相互作用に関しては、B2型金属間化合物における格子欠陥(空孔及びASD)を合金組成及び温度の関数として評価する新しい方法を提唱し、従来から言われているconstitutional vacancyは存在しないことを示した。 (c) 変位型1次相変態の熱力学に対する新しいアプローチでは、Ni濃度を増加して非等温変態を抑制したFe-32.6at%Ni合金に等温変態が存在することを実証した。さらに、この合金に磁場を印加すると瞬時にマルテンサイト変態変態が誘起されることを確認し、等温変態から非等温変態に移行することを明らかにした。 (d) 薄膜における変位型1次相変態の研究では、種々の組成のNi過剰Ti-Ni合金薄膜に2方向形状記憶処理を施し、熱処理条件、組織、特性の関係を明らかにした。また、Ti過剰Ti-Ni合金非晶質薄膜について電子顕微鏡観察で調べ、製膜後の熱処理による結晶化過程、析出形態(特にTi過剰板状析出物、球状Ti2Niの形態、サイズ)について明らかにした。 (e) Fe-Ni合金ナノ粒子の変位型1次相変態を格子軟化の観点から、透過電顕観察と電子回折により調べた。この結果、室温におけるオーステナイト粒子の温度因子はバルクの値の一桁以上、原子の平均二乗変位の平方根にしておよそ3.5倍大きいことが分かった。このことからナノ粒子における顕著な格子軟化は変位型一次相変態に対する促進効果は弱いと考えられる。

Research Products

(26 results)

All Other

All Publications (26 results)

[Publications] K.Otsuka et al.: "Recent Studies on the β_2→ζ2'(Trigonal)Martensitic Transformation in Au-Cd Alloys" Proc.of Displacive Phase Transformations and Their Applications in Materials Engineering. 167-176 (1998)
[Publications] Y.Murakami et al.: "Internal Friction Measurements for the β_2→ζ2'(Trigonal)Martensitic Transformation and the Ageing Effect in a Au-49.5at%Cd Alloy" Proc.of Displacive Phase Transformations and Their Applications in Materials Engineering. 225-232 (1998)
[Publications] M.Kozuma et al.: "Effect of Ageing the R-phase in Ti-Ni Based Alloys" Proc.of Displacive Phase Transformations and Their Applications in Materials Engineering. 233-238 (1998)
[Publications] T.Ohba et al.: "Phonon Softening and Time Dependence of Elastic Peak Appearing Prior to the Martensitic Transformation in Au-47.5at%Cd" Jpn.J.Appl.Phys.37. L64-L66 (1998)
[Publications] X.Ren et al.: "The Role of Softening in Elastic Constant c44 in Martensitic Transformation" Scripta Materialia. 38, 11. 1669-1675 (1998)
[Publications] T.Tamiya et al.: "In-situ Observations of R-Phase Transformation in a Ti_<50>Ni_<48>Fe_2 Alloy by Electron Microscopy" Materials Trans., JIM. 39, 7. 714-723 (1998)
[Publications] K.Otsuka et al.: "Origin of Aging Effect and Rubber-like Behavior in Martensite" The Third Pacific Rim International Conference on Advanced Materials and Processing(PRICM3). 1173-1180 (1998)
[Publications] T.Hara et al.: "Twin Interface Structures in Martensitically Transformed γ_1'Cu-Al-Ni and γ_2'Au-Cd Alloys" The Third Pacific Rim International Conference on Advanced Materials and Processing(PRICM 3). 1199-1204 (1998)
[Publications] X.Ren et al.: "Isothermal Transformation of Au-47.5at%Cd Alloy" The Third Pacific Rim International Conference on Advanced Materials and Processing(PRICM3). 1223-1237 (1998)
[Publications] Y.Murakami et al.: "Electronic Structure Changes Associated with a Martensitic Transformation in a Ti_<50>Ni_<48>Fe_2 Alloy Studied by Electron Energy-loss Spectroscopy" Journal of Electron Microscopy. 47(4). 301-309 (1998)
[Publications] S.Morito et al.: "Magnetic and Martensitic Transformations in Ni_<50>Al_xMn_<50-x> Alloys" Acta Mater.46, 15. 5377-5384 (1998)
[Publications] T.Kakeshita et al.: "Time-dependent Nature of Martensitic Transformations in Some Ferrous and Non-Ferrous Alloys" Proc.of PRICM3 The Minerals, Metals and Materials Society. 1181-1186 (1998)
[Publications] T.Kakeshita et al.: "Effects of Magnetic Field and Hydrostatic Pressure on Martensitic Transformations in Some Ferrous and Non-Ferrous Alloys" Proc.of Displacive Phase Transformations and Their Applications in Materials Engineering. 381-390 (1998)
[Publications] T.Kakeshita et al.: "Effects of Magnetic Field on Athermal and Isothermal Martensitic Transformations in Fe-Ni-Cr Alloys" Materials Transactions, JIM.(in press). (1998)
[Publications] T.Kakeshita et al.: "Effects of Static Magnetic Field and Hydrostatic Pressure on the Isothermal Martensitic Transformation in an Fe-Ni-Cr Alloys" Materials Transactions, JIM.(in press.). (1998)
[Publications] T.Kakeshita et al.: "Effects of Hydrostatic Pressure and Magnetic Field on Martensitic Transformations" Proc.of ICOMAT-98. (accepted.). (1998)
[Publications] A.Gyobu et al.: "Mechanical Properties of Sputter-Deposited Amorphous Ti-Ni Alloys" Proc.of PRICM 3 The Minerals, Metals and Materials Society. 2719-2724 (1998)
[Publications] 刑部冨夫他3名: "Ni過剰Ti-Niスパッタ薄膜のマルテンサイト変態と二方向形状記憶効果" 日本金属学会誌. 61(受理). (1998)
[Publications] A.Gyobu et al.: "Martensitic Transformation and Two-way Shape Memory Effect of Sputter-Deposited Ni-Rich Ti-Ni Alloy Films" Proc.of ICOMAT-98. (accepted.). (1998)
[Publications] Y.Asaka et al.: "TEM and Electron Diffraction on Structure and Phase Transformation of Nanometer-sized Fe-Ni Alloy Particles" The Third Pacific Rim International conference on Advanced Materials and Processing(PRICM 3). 1467-1472 (1998)
[Publications] Y.Nakata et al.: "Formation of Guinier-Preston Zones in Sputter-deposited Ti-Ni Thin Films" The Third Pacific Rim International conference on Advanced Materials and Processing(PRICM 3). 2739-2744 (1998)
[Publications] K.Kifune et al.: "Lattice Orientation Relation of the AuIn_2 Phase to the Au Matrix in the Alloying Process of Au-In Films on Mica and Nacl Substrates" The Third Pacific Rim International conference on Advanced Materials and Processing(PRICM 3). 2597-2602 (1998)
[Publications] T.Tadaki et al.: "Structure and Phase Transformation of Nanometer-sized Particles of Alloys Examined by TEM and Electron Diffraction" Proceedings of the XVII Conference Applied CRYSTALLOGRAPHY. 270-277 (1998)
[Publications] K.Otsuka et al.: "Shape Memory Materials" Cambridge University Press, (1998)
[Publications] K.Inoue et al.: "Displacive Phase Transformations and Their Applications in Materials Engineering" Publication of TMS, (1998)
[Publications] Youyi Chu et al.: "Proc.China-Japan Bilateral Symposium on Shape Memory Alloys" International Academic Publishers, (1998)

1998 Fiscal Year Annual Research Report

変位型相変態の新展開

Principal Investigator

大塚 和弘 筑波大学, 物質工学系, 教授 (50029881)

Research Products

[Publications] K.Otsuka et al.: "Recent Studies on the β_2→ζ2'(Trigonal)Martensitic Transformation in Au-Cd Alloys" Proc.of Displacive Phase Transformations and Their Applications in Materials Engineering. 167-176 (1998)

[Publications] Y.Murakami et al.: "Internal Friction Measurements for the β_2→ζ2'(Trigonal)Martensitic Transformation and the Ageing Effect in a Au-49.5at%Cd Alloy" Proc.of Displacive Phase Transformations and Their Applications in Materials Engineering. 225-232 (1998)

[Publications] M.Kozuma et al.: "Effect of Ageing the R-phase in Ti-Ni Based Alloys" Proc.of Displacive Phase Transformations and Their Applications in Materials Engineering. 233-238 (1998)

[Publications] T.Ohba et al.: "Phonon Softening and Time Dependence of Elastic Peak Appearing Prior to the Martensitic Transformation in Au-47.5at%Cd" Jpn.J.Appl.Phys.37. L64-L66 (1998)

[Publications] X.Ren et al.: "The Role of Softening in Elastic Constant c44 in Martensitic Transformation" Scripta Materialia. 38, 11. 1669-1675 (1998)

[Publications] T.Tamiya et al.: "In-situ Observations of R-Phase Transformation in a Ti_<50>Ni_<48>Fe_2 Alloy by Electron Microscopy" Materials Trans., JIM. 39, 7. 714-723 (1998)

[Publications] K.Otsuka et al.: "Origin of Aging Effect and Rubber-like Behavior in Martensite" The Third Pacific Rim International Conference on Advanced Materials and Processing(PRICM3). 1173-1180 (1998)

[Publications] T.Hara et al.: "Twin Interface Structures in Martensitically Transformed γ_1'Cu-Al-Ni and γ_2'Au-Cd Alloys" The Third Pacific Rim International Conference on Advanced Materials and Processing(PRICM 3). 1199-1204 (1998)

[Publications] X.Ren et al.: "Isothermal Transformation of Au-47.5at%Cd Alloy" The Third Pacific Rim International Conference on Advanced Materials and Processing(PRICM3). 1223-1237 (1998)

[Publications] Y.Murakami et al.: "Electronic Structure Changes Associated with a Martensitic Transformation in a Ti_<50>Ni_<48>Fe_2 Alloy Studied by Electron Energy-loss Spectroscopy" Journal of Electron Microscopy. 47(4). 301-309 (1998)

[Publications] S.Morito et al.: "Magnetic and Martensitic Transformations in Ni_<50>Al_xMn_<50-x> Alloys" Acta Mater.46, 15. 5377-5384 (1998)

[Publications] T.Kakeshita et al.: "Time-dependent Nature of Martensitic Transformations in Some Ferrous and Non-Ferrous Alloys" Proc.of PRICM3 The Minerals, Metals and Materials Society. 1181-1186 (1998)

[Publications] T.Kakeshita et al.: "Effects of Magnetic Field and Hydrostatic Pressure on Martensitic Transformations in Some Ferrous and Non-Ferrous Alloys" Proc.of Displacive Phase Transformations and Their Applications in Materials Engineering. 381-390 (1998)

[Publications] T.Kakeshita et al.: "Effects of Magnetic Field on Athermal and Isothermal Martensitic Transformations in Fe-Ni-Cr Alloys" Materials Transactions, JIM.(in press). (1998)

[Publications] T.Kakeshita et al.: "Effects of Static Magnetic Field and Hydrostatic Pressure on the Isothermal Martensitic Transformation in an Fe-Ni-Cr Alloys" Materials Transactions, JIM.(in press.). (1998)

[Publications] T.Kakeshita et al.: "Effects of Hydrostatic Pressure and Magnetic Field on Martensitic Transformations" Proc.of ICOMAT-98. (accepted.). (1998)

[Publications] A.Gyobu et al.: "Mechanical Properties of Sputter-Deposited Amorphous Ti-Ni Alloys" Proc.of PRICM 3 The Minerals, Metals and Materials Society. 2719-2724 (1998)

[Publications] 刑部冨夫 他3名: "Ni過剰Ti-Niスパッタ薄膜のマルテンサイト変態と二方向形状記憶効果" 日本金属学会誌. 61(受理). (1998)

[Publications] A.Gyobu et al.: "Martensitic Transformation and Two-way Shape Memory Effect of Sputter-Deposited Ni-Rich Ti-Ni Alloy Films" Proc.of ICOMAT-98. (accepted.). (1998)

[Publications] Y.Asaka et al.: "TEM and Electron Diffraction on Structure and Phase Transformation of Nanometer-sized Fe-Ni Alloy Particles" The Third Pacific Rim International conference on Advanced Materials and Processing(PRICM 3). 1467-1472 (1998)

[Publications] Y.Nakata et al.: "Formation of Guinier-Preston Zones in Sputter-deposited Ti-Ni Thin Films" The Third Pacific Rim International conference on Advanced Materials and Processing(PRICM 3). 2739-2744 (1998)

[Publications] K.Kifune et al.: "Lattice Orientation Relation of the AuIn_2 Phase to the Au Matrix in the Alloying Process of Au-In Films on Mica and Nacl Substrates" The Third Pacific Rim International conference on Advanced Materials and Processing(PRICM 3). 2597-2602 (1998)

[Publications] T.Tadaki et al.: "Structure and Phase Transformation of Nanometer-sized Particles of Alloys Examined by TEM and Electron Diffraction" Proceedings of the XVII Conference Applied CRYSTALLOGRAPHY. 270-277 (1998)

[Publications] K.Otsuka et al.: "Shape Memory Materials" Cambridge University Press, (1998)

[Publications] K.Inoue et al.: "Displacive Phase Transformations and Their Applications in Materials Engineering" Publication of TMS, (1998)

[Publications] Youyi Chu et al.: "Proc.China-Japan Bilateral Symposium on Shape Memory Alloys" International Academic Publishers, (1998)

大塚和弘筑波大学, 物質工学系, 教授 (50029881)

[Publications] 刑部冨夫他3名: "Ni過剰Ti-Niスパッタ薄膜のマルテンサイト変態と二方向形状記憶効果" 日本金属学会誌. 61(受理). (1998)