2001 年度実績報告書

高機能合金の結晶化および時効析出過程の組織学的研究

研究課題

研究課題/領域番号	12450297
研究機関	愛媛大学
研究代表者	大森靖也愛媛大学, 工学部, 教授 (10233280)
研究分担者	小林千悟愛媛大学, 工学部, 助手 (10304651) 仲井清眞愛媛大学, 工学部, 助教授 (60038114)
キーワード	高機能合金 / 結晶学 / 透過電子顕微鏡 / 示差走査熱量計 / 非鉄合金 / 鉄基合金 / 磁性材料 / 速度論
研究概要	各種機能材料の結晶化過程や相変態及び時効過程を高分解能透過電子顕微鏡、示差走査熱量分析、高温顕微鏡、X線回折及び試料振動型磁化測定装置によって検討し、下記の研究成果を得た。 1.Pr-Fe-B及びNd-Fe-Cr-Bアモルファス薄帯の結晶化過程と磁気特性の関連の研究。従来、検討されていた範囲より後期の過程における析出相の同定を行うとともに析出順序に関し新しい知見を得た。また粗大なNd_2Fe_<23>B_3粒子がその中に微細なα-Fe粒子を含有するNd_2Fe_<14>B_2粒子に分解することにより大きな交換結合相互作用を生じて優れた永久磁石特性を発揮する機構を見つけた。 2.Al-Mg-Si合金の時効過程の研究。 Al-Mg_2Si擬2元合金の析出過程において、析出強化に最も影響するβ"相の同定には種々の説があったがAndersenのモデルが最も確からしいこと、またβ"相に続く析出相は棒状β'粒子とされていたが、そうではなく立方体状のβ粒子でβ'析出は更に遅れること、最後の生成する板状β粒子と母相の間に新しい結晶方位関係が存在することなどを見出した。 Fe-Ni-C合金ベイナイトの結晶学的研究ベイナイト変態は拡散型の格子変化と続く格子不変せん断で生成するが、続く過程で表面の拡散機構による移動が生じることを確かめた。 3.nearβ型Ti合金やTi-Al系合金の相変態過程を研究。 α"マルテンサイト形成におよぼすωや変態前駆現象の影響、マッシブ組織の形成過程や逆位相界面の形成メカニズムなどにおいて新しい知見を得た。

研究成果
(20件)

すべてその他

すべて文献書誌 (20件)

[文献書誌] Y.Ohmori, L.C.Doan, K.Nakai: "Ageing Processes in Al-Mg-Si Alloys during Continuous Heating"Materials Transactions. 43・2(掲載決定). (2002)
[文献書誌] K.Nakai, T.Minaga, S.Kobayashi, Y.Ohmori: "Microstructural Evolutions during Cooling in a Ti-Al-Zr Alloy"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2543-2546 (2001)
[文献書誌] K.Nakai, K.Watanabe, S.Kobaya-shi, H.Kurishita, Y.Ohmori: "Microstructural Evolutions in Mo-HIC Composite Materials during HIP"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2567-2570 (2001)
[文献書誌] S.Kobyashi, K.Toshimori, K.Nakai, Y.Ohmori: "Effects of Boron Addition on the Decomposition of 0.1C-9Cr Austenite"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2459-2462 (2001)
[文献書誌] S.Kobayashi, K.Nakai, Y.Ohmori: "Phase Transformation from β to α in a Ti-10wt%Zr Alloy"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2567-2570 (2001)
[文献書誌] Y.-C.Jung, Y.Ohmori, K.Nakai, S.Hirosawa, H.Kanekiyo: "Effect of Cr addition on the Crystallization Processes and Magnetic Properties of Nd_<4.5>Fe_<77>X-Cr_X-B18_5 Amorphous Ribbons"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2813-2816 (2001)
[文献書誌] Y.Ohmori, L.C.Doan, Y.Matsu-ura, K.Nakai, S.Kobayashi: "Morphology and Crystallography of β-Mg_2Si Precipitation in Al-Mg-Si Alloys"Materials Transactions. Vol.42. 2576-2583 (2001)
[文献書誌] S.Kobayashi, K.Nakai, Y.Ohmori: "Analysis of Phase Transformation in a Ti-10mass%Zr Alloy by Hot Stage Optical Microscopy"Materials Transactions. Vol.42. 2398-2405 (2001)
[文献書誌] Y.-C.Jung, Y.Ohmori, K.Nakai, S.Hirosawa, H.Kanekiyo: "Crystallization and Phase Decomposition processes in Pr_<4.5>Fe_<77>B_<18.5> Amorphous Ribbons"Materials Transactions. Vol.42. 2102-2111 (2001)
[文献書誌] Y.Ohmori, Y.-C.Jung, K.Nakai, H.Shioiri: "Bainite transformation and the diffusional migration of bainite/austenite interfaces in Fe-9%Ni-C alloys"Acta Materialia. Vol.49. 3149-3162 (2001)
[文献書誌] S.Kobayashi, K.Nakai, Y.Ohmori: "Isothermal decomposition of δ-ferrite in a 25Cr-7Ni-0.14N stainless steel"Acta Materialia. Vol.49. 1891-1902 (2001)
[文献書誌] E.A.Wilson, D.V.Shtansky, Y.Ohmori: "A Kinetic and Electromicroscopic Study of Transformations in Continuously Cooled Fe-15%Ni Alloys"ISIJ International. Vol.41. 866-875 (2001)
[文献書誌] Y.Ohmori, Y.Matsuura, K.Nakai, S.Kobayashi: "Effects of Excess Silicon Content on the Ageing Behaviour of Solution-treated Al-Mg-Si Alloys"Proceedings of The Second International Conference o Light Materials for Transportation Systems, LiMAT-2001. 577-582 (2001)
[文献書誌] Y.Ohmori, T.Ogo, K.Nakai, S.Kobayashi: "Effects of ω-phase precipitation on β→α,α" transformations in a metastable β titanium alloy"Materials Science and Engineering. Vol.A312. 182-188 (2001)
[文献書誌] Y.Ohmori: "Microstructural evolution with precipitation of carbides in steels"ISIJ International. Vol.41. 554-565 (2001)
[文献書誌] 大森靖也: "鉄綱材料の微細組織形成における相変態の結晶学"ふぇらむ. Vol.6. 780-786 (2001)
[文献書誌] S.Kobayashi, K.Nakai, Y.Ohmori: "Decomposition processes of δ-ferrite during continuous heating in a 25Cr-7Ni-0.14N stainless steel"ISIJ International. Vol.40. 802-808 (2000)
[文献書誌] D.V.Shtansky, K.Nakai, Y.Ohmori: "Crystallography and structural evolution during reverse transformation in an Fe-17Cr-0.5C tempered martensite"Acta Materialia. Vol.48. 1679-1689 (2000)
[文献書誌] Long Chau Doan, Yasuya Ohmori, Kiyomichi Nakai: "Effects of Cold Rolling on the Aging Kinetics in an Al-Mg-Si Based alloy"Materials Transactions, JIM. Vol.41. 690-695 (2000)
[文献書誌] K.Nakai, T.Momosaki, Y.Ohmori: "Decomposition Processes of α Phase in a Ti-48 at%Al Alloy"Materials Transactions, JIM. Vol.41. 406-413 (2000)

2001 年度 実績報告書

高機能合金の結晶化および時効析出過程の組織学的研究

研究代表者

大森 靖也 愛媛大学, 工学部, 教授 (10233280)

研究成果

[文献書誌] Y.Ohmori, L.C.Doan, K.Nakai: "Ageing Processes in Al-Mg-Si Alloys during Continuous Heating"Materials Transactions. 43・2(掲載決定). (2002)

[文献書誌] K.Nakai, T.Minaga, S.Kobayashi, Y.Ohmori: "Microstructural Evolutions during Cooling in a Ti-Al-Zr Alloy"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2543-2546 (2001)

[文献書誌] K.Nakai, K.Watanabe, S.Kobaya-shi, H.Kurishita, Y.Ohmori: "Microstructural Evolutions in Mo-HIC Composite Materials during HIP"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2567-2570 (2001)

[文献書誌] S.Kobyashi, K.Toshimori, K.Nakai, Y.Ohmori: "Effects of Boron Addition on the Decomposition of 0.1C-9Cr Austenite"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2459-2462 (2001)

[文献書誌] S.Kobayashi, K.Nakai, Y.Ohmori: "Phase Transformation from β to α in a Ti-10wt%Zr Alloy"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), The Japan Inst. Metals. 2567-2570 (2001)

[文献書誌] Y.Ohmori, L.C.Doan, Y.Matsu-ura, K.Nakai, S.Kobayashi: "Morphology and Crystallography of β-Mg_2Si Precipitation in Al-Mg-Si Alloys"Materials Transactions. Vol.42. 2576-2583 (2001)

[文献書誌] S.Kobayashi, K.Nakai, Y.Ohmori: "Analysis of Phase Transformation in a Ti-10mass%Zr Alloy by Hot Stage Optical Microscopy"Materials Transactions. Vol.42. 2398-2405 (2001)

[文献書誌] Y.-C.Jung, Y.Ohmori, K.Nakai, S.Hirosawa, H.Kanekiyo: "Crystallization and Phase Decomposition processes in Pr_<4.5>Fe_<77>B_<18.5> Amorphous Ribbons"Materials Transactions. Vol.42. 2102-2111 (2001)

[文献書誌] Y.Ohmori, Y.-C.Jung, K.Nakai, H.Shioiri: "Bainite transformation and the diffusional migration of bainite/austenite interfaces in Fe-9%Ni-C alloys"Acta Materialia. Vol.49. 3149-3162 (2001)

[文献書誌] S.Kobayashi, K.Nakai, Y.Ohmori: "Isothermal decomposition of δ-ferrite in a 25Cr-7Ni-0.14N stainless steel"Acta Materialia. Vol.49. 1891-1902 (2001)

[文献書誌] E.A.Wilson, D.V.Shtansky, Y.Ohmori: "A Kinetic and Electromicroscopic Study of Transformations in Continuously Cooled Fe-15%Ni Alloys"ISIJ International. Vol.41. 866-875 (2001)

[文献書誌] Y.Ohmori, Y.Matsuura, K.Nakai, S.Kobayashi: "Effects of Excess Silicon Content on the Ageing Behaviour of Solution-treated Al-Mg-Si Alloys"Proceedings of The Second International Conference o Light Materials for Transportation Systems, LiMAT-2001. 577-582 (2001)

[文献書誌] Y.Ohmori, T.Ogo, K.Nakai, S.Kobayashi: "Effects of ω-phase precipitation on β→α,α" transformations in a metastable β titanium alloy"Materials Science and Engineering. Vol.A312. 182-188 (2001)

[文献書誌] Y.Ohmori: "Microstructural evolution with precipitation of carbides in steels"ISIJ International. Vol.41. 554-565 (2001)

[文献書誌] 大森靖也: "鉄綱材料の微細組織形成における相変態の結晶学"ふぇらむ. Vol.6. 780-786 (2001)

[文献書誌] S.Kobayashi, K.Nakai, Y.Ohmori: "Decomposition processes of δ-ferrite during continuous heating in a 25Cr-7Ni-0.14N stainless steel"ISIJ International. Vol.40. 802-808 (2000)

[文献書誌] D.V.Shtansky, K.Nakai, Y.Ohmori: "Crystallography and structural evolution during reverse transformation in an Fe-17Cr-0.5C tempered martensite"Acta Materialia. Vol.48. 1679-1689 (2000)

[文献書誌] Long Chau Doan, Yasuya Ohmori, Kiyomichi Nakai: "Effects of Cold Rolling on the Aging Kinetics in an Al-Mg-Si Based alloy"Materials Transactions, JIM. Vol.41. 690-695 (2000)

[文献書誌] K.Nakai, T.Momosaki, Y.Ohmori: "Decomposition Processes of α Phase in a Ti-48 at%Al Alloy"Materials Transactions, JIM. Vol.41. 406-413 (2000)

2001 年度実績報告書

大森靖也愛媛大学, 工学部, 教授 (10233280)