強ひずみ加工による表層ガラス化および大過冷却制御によるバルク化

• Project/Area Number: 15074211
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Osaka University
• Principal Investigator: 辻 伸泰 Osaka University, 大学院・工学研究科, 准教授 (30263213)
• Co-Investigator(Kenkyū-buntansha): 安田 秀幸 大阪大学, 大学院・工学研究科, 教授 (60239762) ; 小林 紘二郎 福井工業大学, 工学部, 教授 (70026277)
• Project Period (FY): 2003 – 2007
• Project Status: Completed (Fiscal Year 2007)
• Budget Amount: ¥53,000,000 (Direct Cost: ¥53,000,000); Fiscal Year 2007: ¥10,100,000 (Direct Cost: ¥10,100,000); Fiscal Year 2006: ¥10,100,000 (Direct Cost: ¥10,100,000); Fiscal Year 2005: ¥16,000,000 (Direct Cost: ¥16,000,000); Fiscal Year 2004: ¥11,200,000 (Direct Cost: ¥11,200,000); Fiscal Year 2003: ¥5,600,000 (Direct Cost: ¥5,600,000)
• Keywords: 強ひずみ加工 / メカニカルアロイング / 過飽和固溶体 / 金属ガラス / ナノコンポジット / 過冷融液 / 結晶成長 / 凝固 / ARB / フェムト秒レーザー / 衝撃波 / 超急冷 / 過冷却融液 / 無容器プロセス / 核生成

Research Abstract

昨年度までの研究により、純Zrと純Cuの積層体に対して室温でARBプロゼスにより強ひずみ加工を行なうと、界面近傍で原子レベルの混合が生じて部分的に金属ガラスが生じること、さらにARB材を400℃近傍で熱処理すると、試料の多くの部分が金属ガラスになることを明らかにした。しかしながら、ARBでは付与できるひずみ量に限りがあり、金属ガラス化が部分的に限られることも判明した。そこで本年度は、Zr/Cu他の純金属接合体に対してHPTプロセスを用いて相当ひずみ最大1000に至る大加工を室温で行なった。その結果、20回転以上めKPT加工により、試料全面が金属ガラス化することを見出した。
大過冷却制御によるバルク化に関しては、本年度はおもにZr-Cu系の過冷融液中における結晶相の成長「速度を測定した。2元系Zr-Cu系では、1)Zr50Cu50組成では、平衡相であるZrCu化合物は核生成せず、過冷融液からZr2Cu化合物が初晶として成長する、2)A1の添加によりZrCu化合物が核生成し、初晶となるが、成長速度はlmm/s以下である、3)Zr66Cu33組成においてZr2Cu化合物が初晶として成長したが、成長速度は1Omm/s以下である。Zr-Ni系の結果と比較し、Zr-Cu系の成長速度は遅く、ガラス化に有利な系であった。金型鋳造のシミュレーション結果も含めてガラス化プロセスを検討し、Zr-Ni-Al系、Zr-Cu-Al系は鋳型との界面で核生成しても内部にはガラス相を形成できる系であると結論づけられた。

Research Products

• [Journal Article] Bulk Mechanical Alloying of Cu-Ag and Cu/Zr Two Phase Microstructures by Accrmulative Roll Bonding Process (2007)
  • Author(s): S., Ohsaki・S., Kato・N., Tsuji・T., Ohkubo・K., Hono
  • Journal Title: Acta Mater 55 Pages: 2885-2895
  • Peer Reviewed
• [Journal Article] Recent progress of EPM in steelmaking, casting, and solidefication processing (2007)
  • Author(s): H., Yasuda・T., Toh・K., Iwai・K., Morita
  • Journal Title: ISIJ International 47 Pages: 619-626
  • Peer Reviewed
• [Journal Article] Glassy Solidification Criterion of Zr50Cu40A110 Alloy (2007)
  • Author(s): Y., Yokoyama・H., Fredriksson・H., Yasuda・M., Nishijima・A., Inoue
  • Journal Title: Mater Trans 48 Pages: 1363-1372
  • Peer Reviewed
• [Journal Article] Grain Size Saturation during Severe Plastic Deformation (2007)
  • Author(s): N.Tsuji, N.Kamikawa, B.Li
  • Journal Title: Mater. Sci. Forum Vols.539-543 Pages: 2837-2842
• [Journal Article] Hardening by Annealing and Softening by Deformation in Nanostructured Metals (2006)
  • Author(s): X.Huang, N.Hansen, N.Tsuji
  • Journal Title: Science Vol.312,No.5771 Pages: 249-251
• [Journal Article] Microstructure Homogeneity in Various Metallic Materials Heavily Deformed by Accumulative Roll-Bonding (2006)
  • Author(s): B.L.Li, N.Tsuji, N.Kamikawa
  • Journal Title: Mater. Sci. Eng. Vol.423,No.1-2 Pages: 331-342
• [Journal Article] Application of High Magnetic Fields on Solidification Processig (2006)
  • Author(s): H.Yasuda
  • Journal Title: Proc. 5th Int. Symposium on Electromagnetic processing of Materials Pages: 345-350
• [Journal Article] Measurement of Crystal Growth Velocity in Bulk-metallic-glass Forming Alloys (2006)
  • Author(s): H.Yasuda, D.Nagamatsu, Y.Tamura, T.Yoshimoto, T.Nagira, Y.Yokoyama, A.Inoue
  • Journal Title: roc. 5th Int. Symposium on Electromagnetic processing of Materials Pages: 449-453
• [Journal Article] Bulk Mechanical Alloying of Zr-Cu System by Accumulative Roll Bonding (ARB). (2005)
  • Author(s): N.Tsuji, S.Kato, S.Ohsaki, K.Hono, Y.Minamino
  • Journal Title: J.Metastable and Nanocrystalline Mater. 24-25 Pages: 643-646
• [Journal Article] Elongation Increase in Ultra-Fine Grained Al-Fe-Si Alloy Sheets (2005)
  • Author(s): H.W.Kim, S.B.Kang, N.Tsuji, Y.Minamino
  • Journal Title: Acta Mater. 53 Pages: 1737-1749
• [Journal Article] Nucleation and growth in undercooled melts of bulk-metallic-glass forming Zr60Ni25A115 alloy (2005)
  • Author(s): H.Yasuda, Y.Tamura, T.Nagira, I.Ohnaka, Y.Yokoyama, A.Inoue
  • Journal Title: Mater.Trans., 46 (2005)2762-2767. 46 Pages: 2762-2767
• [Journal Article] Investigation of the melt flow on solidified structure by a levitation technique using alternative and static magnetic fields (2005)
  • Author(s): H.Yasuda, I.Ohnaka, R.Ishii, S.Fujita, Y.Tamura
  • Journal Title: ISIJ International 45 Pages: 991-996
  • NAID: 10016561657
• [Journal Article] Femtosecond laser driven shock quenching of the high-pressure phase of iron (2005)
  • Author(s): T.Sano, H.Mori, O.Sakata, E.Ohmura, I.Miyamoto, A.Hirose, K.F.Kobayashi
  • Journal Title: Applied Surface Science Vol.247 Pages: 571-576
• [Journal Article] Femtosecond laser driven shock quenching of the nanocrystalline high-pressure phase of iron (2005)
  • Author(s): T.Sano, H.Mori, O.Sakata, E.Ohmura, I.Miyamoto, A.Hirose, K.F.Kobayashi
  • Journal Title: Materials Science Forum Vol.475-479 Pages: 3475-3478
• [Journal Article] 微細粒軽量金属の研究動向-メタラジーの視点から- (2004)
  • Author(s): 辻 伸泰
  • Journal Title: まてりあ Vol.43,No.5 Pages: 405-410
  • NAID: 10013070300
• [Journal Article] Microstructures and Mechanical Properties of Bulk Nanocrystalline FeAl-C Alloys Made by Mechanically Alloying with Subsequent Spark Plasma Sintering (2004)
  • Author(s): Y.Minamino, Y.Koizumi, N.Tsuji, N.Hirohata, K.Mizuuchi, Y.Ohkanda
  • Journal Title: Sci.Tech of Adv.Mater. 5/1-2 Pages: 133-143
• [Journal Article] Formation of Nanocrystalline Surface Layers in Various Metallic Materials by Near Surface Severe Plastic Deformation (2004)
  • Author(s): M.Sato, N.Tsuji, Y.Minamino, Y.Koizumi
  • Journal Title: Sci.Tech of Adv.Mater. 5/1-2 Pages: 145-152
• [Journal Article] Structure and Strength After Large Strain Deformation (2004)
  • Author(s): N.Hansen, X.Huang, R.Ueji, N.Tsuji
  • Journal Title: Mater.Sci.Eng.A 387-389 Pages: 191-194
• [Journal Article] Aging Behavior of Ultrafine Grained Al-2wt.%Cu Alloy Severely Deformed by Accumulative Roll Bonding (ARB) (2004)
  • Author(s): N.Tsuji, T.Iwata, M.Sato, S.Fujimoto, Y.Minamino
  • Journal Title: Sci.Tech of Adv.Mater. 5/1-2 Pages: 173-180
• [Journal Article] Investigation of the morphological transition in the solidified structure by using an AC+CD levitation technique (2004)
  • Author(s): H.Yasuda
  • Journal Title: Proc.1st Asian EPM workshop Pages: 90-96
• [Presentation] Mechanical Alloying And Non-equilibrium Phase Formation By Severe Plastic Deformation (2007)
  • Author(s): Y., F., Sun・N., Tsuji・T., Nakamura・C., H., Wang・Y., Todaka・M., Umemoto
  • Organizer: PRICM6
  • Place of Presentation: Jeju, Korea
  • Year and Date: 2007-11-08
• [Book] Applications of High Magnetic Fields in Materials Processing: Magnetohydrodynamics, Historical Evolution and Trends, Series: Fluid Mechanics and Its Applications (2007)
  • Author(s): H., Yasuda
  • Total Pages: 407
  • Publisher: Springer, Dordrecht, The Netherland
• [Book] SEVERE PLASTIC DEFORMATION : Towards Bulk Production of Nanostructured Materials (2006)
  • Author(s): N.Tsuji
  • Total Pages: 612
  • Publisher: NOVA Science Publishers, NY
• [Book] 「ナノマテリアル工学大系 第2巻ナノ金属編」第5章第11節「強ひずみ加工法」 (2005)
  • Author(s): 辻伸泰
  • Total Pages: 1050
  • Publisher: フジ・テクノシステム
• [Book] 「構造工学ハンドブック」1.1.1(2)超微細粒高強度材料?アルミニウム合金 (2004)
  • Author(s): 辻 伸泰(分担執筆)
  • Total Pages: 4
  • Publisher: 丸善
• [Publications] M.Sato, N.Tsuji, Y.Minamino, Y.Koizumi: "Fabrication of Surface Nanocrystalline Aluminum Alloys"Materials Science Forum. 426-432. 2753-2758 (2003)
• [Publications] M.Sato, N.Tsuji, Y.Minamino, Y.Koizumi: "Formation of Nanocrystalline Surface Layers in Various Metallic Materials by Near Surface Severe Plastic Deformation"Science and Technology of Advanced Materials. Vol.5, No.1-2. 145-152 (2004)
• [Publications] N.Tsuji, M.Sato, Y.Minamino, Y.Koizumi: "Surface Nanocrystalline Metallic Materials Fabricated by Near Surface Severe Plastic Deformation"Proc.of the Int.Symp.On Surfaces and Interfaces in Nanostructured Materials, TMS. (In press). (2004)
• [Publications] H.Yasuda, I.Ohnaka, Y.Ninomiya, R.Ishi, S.Fujita, K.Kishio: "Levitation of metallic melt by using the simultaneous imposition of the alternating and the static magnetic fields"Journal of Crystal Growth. Vol.260 No.3-4. 475-485 (2004)