Examination of the origin of the peculiar anomalous strengthening behavior appeared in some Ni-solid solution alloys

• Project/Area Number: 22760540
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Structural/Functional materials
• Research Institution: Osaka University
• Principal Investigator: HAGIHARA Koji 大阪大学, 大学院・工学研究科, 准教授 (10346182)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2010: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 短範囲規則構造(SRO) / 異常強化 / 塑性変形 / Ni基超合金 / 転位 / 単結晶 / 高温変形 / TEM

Research Abstract

We examined the plastic deformation behavior of Ni-22Cr-8W(at.%), Ni-8W, and Ni-5Re Ni-solid solution alloy single crystals. We first found that yield stress anomaly(YSA) appears in Ni-22Cr-8W(at.%) and Ni-8W single crystals in which the solute atoms form the short-range ordered(SRO) structure. The peak temperature of the YSA is considered to be related to the thermal stability of the SRO. The control of SRO has a potential to improve the high-temperature strength of the materials by inducing the deformation behavior different from those in solid-solution alloys and fully ordered alloys.

Research Products

• [Journal Article] Plastic deformation behavior of Ni_3(Ti_<0. 7> Nb_<0. 3>) single crystals with D0_<19> structure (2010)
  • Author(s): K. Hagihara, H. Fujimoto, T. Nakano and Y. Umakoshi
  • Journal Title: Intermetallics Volume: 18 Pages: 434-440
  • URL: http://dx.doi.org/10.1016/j.intermet
  • Peer Reviewed
• [Journal Article] Change in microstructure by heat-treatment and corresponding deformation behavior in Ni_3V single crystals (2010)
  • Author(s): K. Hagihara, M. Mori, T. Kishimoto and Y. Umakoshi
  • Journal Title: Materials Science Forum Volume: 638-642 Pages: 1318-1323
  • URL: http://dx.doi.org/10.4028/www.scientific.net/MSF.638-642.1318
  • Peer Reviewed
• [Journal Article] Plastic deformation behavior of Ni_3(Ti_<0.7>Nb_<0.3>) single crystals with D0_<19> structure (2010)
  • Author(s): K.Hagihara, H.Fujimoto, T.Nakano, Y.Umakoshi
  • Journal Title: Intermetallics Volume: 18 Pages: 434-440
  • Peer Reviewed
• [Presentation] γ固溶体型Ni-(W, Re)合金単結晶の塑性変形挙動 (2011)
  • Author(s): 濱洋一郎, 藤江勇太, 萩原幸司
  • Organizer: 日本金属学会2011秋期大会
  • Place of Presentation: 沖縄コンベンションセンター
  • Year and Date: 2011-11-09
• [Presentation] γ固溶体型Ni-(W,Re)合金単結晶の塑性変形挙動 (2011)
  • Author(s): 濱洋一郎, 藤江勇太, 萩原幸司
  • Organizer: 日本金属学会2011秋期大会
  • Place of Presentation: 沖縄コンベンションセンター
  • Year and Date: 2011-11-09
• [Presentation] γ固溶体型Ni-Cr-W合金単結晶の塑性変形挙動 (2011)
  • Author(s): 萩原幸司, 藤江勇太
  • Organizer: 日本金属学会2011春期大会
  • Year and Date: 2011-03-27
• [Remarks] 申請者ホームページ
  • URL: http://www.hfs.ams.eng.osaka-u.ac.jp/