2001 Fiscal Year Annual Research Report

複合機能化ミクロ組織因子・界面制御

Research Project

Project/Area Number	11221206
Research Institution	Osaka University
Principal Investigator	馬越佑吉大阪大学, 大学院・工学研究科, 教授 (00029216)
Co-Investigator(Kenkyū-buntansha)	安田弘行大阪大学, 大学院・工学研究科, 助手 (60294021) 中野貴由大阪大学, 大学院・工学研究科, 助教授 (30243182)
Keywords	界面 / 粒界 / 相変態 / シリサイド / 強度 / 磁歪 / 形状記憶
Research Abstract	界面制御による力学特性の改善と、相変態に及ぼす界面構造、粒界性格の影響を明らかにすると共に、粒界構造、界面制御による機能特性改善を行った。軽量耐熱材料として期待されているTiAlのAl-rich側組成に現れる、Al_3Ti_5およびAl_2Ti化合物の析出形態、L1_0型母相との界面整合関係、形成されるAPBを分類し、その選択性を観察することでこれら化合物の析出過程、析出機構を明らかにすると共に、高強度化に向けての適正形態を明らかにした。また、C11_bおよびC40型複相合金の界面を層状に制御する結晶成長プロセスを開発すると共に、析出過程でのバリアント選択性に起因する界面での歪みの連続性が、この複相シリサイドの力学特性の飛躍的改善に繋がることを明らかにした。また、機能特性と密接に関係するマルテンサイト変態と結晶粒界構造、粒界性格との関係を明らかにするため、Fe-Ni合金単結晶、ねじり粒界双結晶、対称傾角粒界双結晶を用い、マルテンサイト変態への粒界性格の影響、付加応力、予歪みの効果を詳細に調べた。傾角粒界の場合、マルテンサイト変態に際して、粒界を挟み変態歪みの連続性が維持されるバリアント選択が可能であり、そのため粒界は変態の核生成サイトを働くことを明らかにした。また、応力負荷、予歪み効果についても顕著な粒界性格依存性を認めた。NiAlの脆化の一因である粒界破壊を抑制するため、加工性に富むNi3Al相を粒界に析出させ、その界面での整合関係からのずれ角の関数として界面今強度を求めた。また、整合界面を得るための集合組織制御のための加工熱処理プロセスを開発した。また、磁気応答型形状記憶合金としてFe-Pd合金を取り上げ、粒界性格、結晶粒径と磁場付加方向と、発生磁歪との相関関係を明らかにし,巨大磁歪発現への形態学的な条件を示した。

Research Products

(18 results)

All Other

All Publications (18 results)

[Publications] H.Y.Yasuda, Y.Yamamura, Y.Umakoshi: "Recrystallization texture in cold-rolled Co_3Ti polycrystals"Scripta materialia. 44. 765-769 (2001)
[Publications] T.Nakano, H.Biermann, H.Mughrobi, Y.Nakai, Y.Umakoshi: "Classification of γ-γ' and γ-α_2 lamellar boundaries on the basis of continuity of strains and slip-twinning, Planes in TiAl"Phil.Mag.A. 81[6]. 1447-1471 (2001)
[Publications] Y.Umakoshi, T.Nakano, M.Azuma: "Anomalous strengthening mechanism in NbSi_2-based silicide single crystal"Mat.Res.Soc.Sympo.Proc.. 646. N2.5.1-N2.5.6 (2001)
[Publications] T.Sakata, H.Y.Yasuda, Y.Umakoshi: "Control of microstructure and orientation distribution in Ni-Al-based (β/γ') two phase alloys by thermomechanical"Acta materialia. 49. 4231-4239 (2001)
[Publications] M.Ueda, H.Y.Yasuda, T.Umakoshi: "Stress-induced martensitic transformation in Fe-Ni dicrystals"Acta materialia. 49. 4251-4258 (2001)
[Publications] T.Sakata, H.Y.Yasuda, Y.Umakoshi: "Development of microstructure and texture in rapidly solidified and annealed Ni-Al alloys"Materials Transactions. 42[11]. 2382-2385 (2001)
[Publications] M.Ueda, H.Y.Yasuda, Y.Umakoshi: "Effect of grain boundary character on the martensitic transformation in Fe-32 at.%Ni bicrystals"Acta materialia. 49. 3421-3432 (2001)
[Publications] H.Y.Yasuda, N.Koumoto, Y.Umakoshi: "Effect of microstructure on field-induced strain in Fe-Pd ferromagnetic shape memory alloys"PRICM4. 1707-1710 (2001)
[Publications] T.Nagase, Y.Umakoshi: "Effect of B concentration on phase transformation in Fe-Zr-B amorphous alloys"PRICM4. 79-82 (2001)
[Publications] K.Hayashi, T.Nakano, Y.Umakoshi: "Plastic deformation behaviour and deformation substructure in Al-rich TiAl single crystals deformed at high temperatures"Science and Technology of Advanced Materials. 2. 433-441 (2001)
[Publications] T.Nagase, Y.Umakoshi, N.Sumida: "Effect of electron irradiation on the phase stability of Fe-9Zr-3B alloy"Materials Science and Ergineering A. 323. 218-225 (2002)
[Publications] T.Nakano, K.Hayashi, Y.Umakoshi: "Formation and stability of transitional long-period superstructures in Al-rich Ti-Al single crystals"Phil.Mag.A. 82[4]. 763-777 (2002)
[Publications] H.Y.Yasuda, N.Koumoto, Y.Umakoshi: "Microstructure control for developing Fe-Pd ferromagnetic shape memory alloys"Science and Technology of Advanced Materials. (印刷中).
[Publications] T.Sakata, H.Y.Yasuda, Y.Umakoshi: "Concurrent design for NiAl-based (β/γ') two-phase alloys by controlling microstructure and texture"Science and Technology of Advanced Materials. (印刷中).
[Publications] K.Hagihara, T.Nakano, Y.Umakoshi: "Microstructure and compressive flow stress of directionally solidified ternary Ni_3(Al, Nb) and Ni_3(Al, Nb, Ti) alloys"Science and Technology of Advanced Materials. (印刷中).
[Publications] T.Nakano, Y.Nakai, Y.Umakoshi: "Selection and change in deformation mode to maintain continuity of strains and slip/twinning planes"Science and Technology of Advanced Materials. (印刷中).
[Publications] T.Nagase, Y.Umakoshi, N.Sumida: "Formation of nanocrystalline structure during electron irradiation induced crystallization"Science and Technology of Advanced Materials. (印刷中).
[Publications] M.Ueda, H.Y.Yasuda, Y.Umakoshi: "Effect of grain boundary character on the martensite transformation in Fe-32 at.%Ni bicrystals"Science and Technology of Advanced Materials. (印刷中).

2001 Fiscal Year Annual Research Report

複合機能化ミクロ組織因子・界面制御

Principal Investigator

馬越 佑吉 大阪大学, 大学院・工学研究科, 教授 (00029216)

Research Products

[Publications] H.Y.Yasuda, Y.Yamamura, Y.Umakoshi: "Recrystallization texture in cold-rolled Co_3Ti polycrystals"Scripta materialia. 44. 765-769 (2001)

[Publications] T.Nakano, H.Biermann, H.Mughrobi, Y.Nakai, Y.Umakoshi: "Classification of γ-γ' and γ-α_2 lamellar boundaries on the basis of continuity of strains and slip-twinning, Planes in TiAl"Phil.Mag.A. 81[6]. 1447-1471 (2001)

[Publications] Y.Umakoshi, T.Nakano, M.Azuma: "Anomalous strengthening mechanism in NbSi_2-based silicide single crystal"Mat.Res.Soc.Sympo.Proc.. 646. N2.5.1-N2.5.6 (2001)

[Publications] T.Sakata, H.Y.Yasuda, Y.Umakoshi: "Control of microstructure and orientation distribution in Ni-Al-based (β/γ') two phase alloys by thermomechanical"Acta materialia. 49. 4231-4239 (2001)

[Publications] M.Ueda, H.Y.Yasuda, T.Umakoshi: "Stress-induced martensitic transformation in Fe-Ni dicrystals"Acta materialia. 49. 4251-4258 (2001)

[Publications] T.Sakata, H.Y.Yasuda, Y.Umakoshi: "Development of microstructure and texture in rapidly solidified and annealed Ni-Al alloys"Materials Transactions. 42[11]. 2382-2385 (2001)

[Publications] M.Ueda, H.Y.Yasuda, Y.Umakoshi: "Effect of grain boundary character on the martensitic transformation in Fe-32 at.%Ni bicrystals"Acta materialia. 49. 3421-3432 (2001)

[Publications] H.Y.Yasuda, N.Koumoto, Y.Umakoshi: "Effect of microstructure on field-induced strain in Fe-Pd ferromagnetic shape memory alloys"PRICM4. 1707-1710 (2001)

[Publications] T.Nagase, Y.Umakoshi: "Effect of B concentration on phase transformation in Fe-Zr-B amorphous alloys"PRICM4. 79-82 (2001)

[Publications] K.Hayashi, T.Nakano, Y.Umakoshi: "Plastic deformation behaviour and deformation substructure in Al-rich TiAl single crystals deformed at high temperatures"Science and Technology of Advanced Materials. 2. 433-441 (2001)

[Publications] T.Nagase, Y.Umakoshi, N.Sumida: "Effect of electron irradiation on the phase stability of Fe-9Zr-3B alloy"Materials Science and Ergineering A. 323. 218-225 (2002)

[Publications] T.Nakano, K.Hayashi, Y.Umakoshi: "Formation and stability of transitional long-period superstructures in Al-rich Ti-Al single crystals"Phil.Mag.A. 82[4]. 763-777 (2002)

[Publications] H.Y.Yasuda, N.Koumoto, Y.Umakoshi: "Microstructure control for developing Fe-Pd ferromagnetic shape memory alloys"Science and Technology of Advanced Materials. (印刷中).

[Publications] T.Sakata, H.Y.Yasuda, Y.Umakoshi: "Concurrent design for NiAl-based (β/γ') two-phase alloys by controlling microstructure and texture"Science and Technology of Advanced Materials. (印刷中).

[Publications] K.Hagihara, T.Nakano, Y.Umakoshi: "Microstructure and compressive flow stress of directionally solidified ternary Ni_3(Al, Nb) and Ni_3(Al, Nb, Ti) alloys"Science and Technology of Advanced Materials. (印刷中).

[Publications] T.Nakano, Y.Nakai, Y.Umakoshi: "Selection and change in deformation mode to maintain continuity of strains and slip/twinning planes"Science and Technology of Advanced Materials. (印刷中).

[Publications] T.Nagase, Y.Umakoshi, N.Sumida: "Formation of nanocrystalline structure during electron irradiation induced crystallization"Science and Technology of Advanced Materials. (印刷中).

[Publications] M.Ueda, H.Y.Yasuda, Y.Umakoshi: "Effect of grain boundary character on the martensite transformation in Fe-32 at.%Ni bicrystals"Science and Technology of Advanced Materials. (印刷中).

馬越佑吉大阪大学, 大学院・工学研究科, 教授 (00029216)