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Evaluation and application of giant elastic strain in Cu-based beta alloys

Research Project

Project/Area Number 21K18802
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 26:Materials engineering and related fields
Research InstitutionTohoku University

Principal Investigator

Kainuma Ryosuke  東北大学, 工学研究科, 教授 (20202004)

Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
KeywordsCu-Al-Mn / 単結晶 / 巨大弾性歪 / 低弾性率 / 異常粒成長 / 巨大弾性歪現象
Outline of Research at the Start

近年、CuAlMn合金において、サイクル熱処理による異常粒成長現象を用いることで単結晶を製造する手法が開発された。また、その様にして得た単結晶では、特定方向において約4%もの巨大な弾性歪と著しく低い弾性率が確認された。そこで本研究では、Cu-Al-Mn合金単結晶を主な対象とし、その機械特性、結晶構造、材料組織を詳細に調査し、合わせて理論計算も用いることでその起源を明らかにする。また、その情報を元に同様な現象が見込まれ導電率の高い他の銅合金系を探索し、電子部材への応用を検討する。

Outline of Final Research Achievements

We studied the huge elastic strain that appears in Cu-Al-Mn single crystals. Using abnormal grain growth using cyclic heat treatment, Cu-Al-Mn single crystal sheets having an orientation close to <100 > were prepared and tensile tested. As a result, it was confirmed that the temperature dependence of Young's modulus was extremely small, and good repeatability characteristics could be obtained. In addition, in situ neutron diffraction measurements were performed, and it was found that the parent phase was elastically deformed up to about 4% strain and no martensitic phase appeared. Using the elastic modulus obtained by the vibration method, it was clarified that the abnormality of Young's modulus is mainly related to the value of C', and it was found that this softening phenomenon is due to the asymmetry of the interatomic potential. The same phenomenon was confirmed for the Cu-Zn-Al system with high electric conductivity.

Academic Significance and Societal Importance of the Research Achievements

Cu-Al-Mn系合金の<100>方向の低ヤング率は、規則bcc相のC‘の値が小さい点、すなわち弾性異方性定数の大きいことに起因することが分かった。従って、他の合金系であっても弾性異方性定数の大きなbcc規則合金において同様の現象が生じると推測される。実際、弾性異方性が高いことが知られていたCu-Zn-Al系合金でも同様の現象が得られた。<100>方位の最大弾性歪を他の主な材料と比較すると、Alや鉄鋼材料では0.5%程度であるのに対し最大3%以上であり、特にCu-Zn-Al系は導電率が高いため、高弾性が求められるコネクターやバネを始めとした電子部品への応用が期待できる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (13 results)

All 2023 2022 2021 Other

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 6 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] その場中性子回析による金属材料における巨大弾性歪み現象の解明2023

    • Author(s)
      許勝, 許皛, 大森俊洋, 貝沼亮介, ハルヨステファヌス, 川崎卓郎
    • Journal Title

      四季(中性子産業利用推進協議会季報)

      Volume: 58 Pages: 1-6

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Non-Hookean Large Elastic Deformation in Bulk Crystalline Metals2022

    • Author(s)
      S. Xu, T. Odaira, S. Sato, X. Xu, T. Omori, S. Harjo, T. Kawasaki, H. Seiner, K. Zoubkova, Y. Murakami, R. Kainuma
    • Journal Title

      Nature Commun.

      Volume: 13 Issue: 1 Pages: 5307-5307

    • DOI

      10.1038/s41467-022-32930-9

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Orientation Dependence of Plasticity and Fracture in Single-Crystal Superelastic Cu-Al-Mn SMA Bars2021

    • Author(s)
      Sumio Kise, Yoshikazu Araki, Toshihiro Omori, and Ryosuke Kainuma
    • Journal Title

      Journal of Materials in Civil Engineering

      Volume: 33 Issue: 4

    • DOI

      10.1061/(asce)mt.1943-5533.0003568

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] ホイスラー型バルクCu-Al-Mn合金における巨大弾性変形2023

    • Author(s)
      許 勝, 大平 拓実、佐藤 駿介、許 皛、大森 俊洋、ハルヨ ステファヌス、川崎 卓郎、Hanus; Seiner、Kristyna Zoubkova;、村上 恭和、貝沼亮介
    • Organizer
      (公社)日本金属学会2023年春期(第178回)講演大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Observation of Non-Hookean Huge Elastic Deformation in A Bulk Heusler-type Cu-Al-Mn alloy2022

    • Author(s)
      Sheng Xu, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma
    • Organizer
      2022 MRS(Materials Research Society) Fall Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Revisiting the phase equilibria in the Cu-Zn binary system2022

    • Author(s)
      H. Lee, I. Lee, T. Omori, R. Kainuma
    • Organizer
      Material Science and Engineering 2022 Congress
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Cu-Al-Mn 形状記憶合金の異常粒成長挙動に及ぼすミクロ組織の影響2022

    • Author(s)
      李 炯録, 許勝, 大森俊洋, 貝沼亮介
    • Organizer
      (公社)日本金属学会2022年秋期(第177回)講演大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] A combinatorial approach to investigate abnormal grain growth behavior in Cu-Al-Mn shape memory alloys2022

    • Author(s)
      Lee Hyongrok,T. Omori, R. Kainuma
    • Organizer
      TMS 2022 Annual Meeting & Exhibition (Virtual)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Cu-Al-Mn 合金における低温形状記憶効果2021

    • Author(s)
      佐藤駿介, 大森俊洋, 貝沼亮介
    • Organizer
      (公社)日本金属学会2021年秋期(第169回)講演大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Auxetic Behavior in Single-crystalline and Texture-controlled Poly-crystalline Cu-Al-Mn-based Shape Memory Alloys2021

    • Author(s)
      Sheng Xu, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma
    • Organizer
      ICOMAT 2022(Virtual)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Abnormal Grain Growth and Superelasticity in CuMnAl and FeMnAlNi Shape Memory Alloys2021

    • Author(s)
      R. Kainuma
    • Organizer
      ICOMAT 2022(Virtual)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Orientation-designed large single-crystal Cu-Al-Mn alloys by abnormal grain growth and their enhanced functional properties2021

    • Author(s)
      S. Xu, X. Xu, T. Omori, R. Kainuma
    • Organizer
      TMS 2021 Annual Meeting & Exhibition (Virtual)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Remarks] 東北大学大学院工学研究科マテリアル開発系金属フロンティア工学専攻 貝沼・大森研究室

    • URL

      http://www.material.tohoku.ac.jp/~seigyo/

    • Related Report
      2022 Annual Research Report

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Published: 2021-07-13   Modified: 2024-01-30  

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