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Reduction of Grain boundary energy to stabilize ultra-fine grain structure produced by severe plastic deformation

Research Project

Project/Area Number 19560711
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionDoshisha University

Principal Investigator

MIYAMOTO Hiroyuki  Doshisha University, 理工学部, 教授 (10298698)

Co-Investigator(Kenkyū-buntansha) MIMAKI Takuro  同志社大学, 理工学部, 名誉教授 (20066244)
Project Period (FY) 2007 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsナノクリスタル / 超微細結晶材料 / 強ひずみ加工法 / ECAP / 応力腐食割れ / 強ひずみ加工 / 結晶粒界 / 粒界構造 / ECAP法 / 腐食
Research Abstract

等径角付き押し出し(Equal-Channel Angular Pressing : ECAP)法により超微細結晶化したα黄銅(Cu-10wt%Zn)について応力腐食割れ(Stress Corrosion Cracking : SCC)感受性を評価し, 結晶粒径の影響, 平衡・非平衡粒界の影響を明らかにする事を目的とした. 強ひずみ加工法の一つであるECAP法により室温で8パス加工することにより, 結晶粒径が平均約100nmまで微細化することに成功した. 8パス加工材ではECAP加工後に200℃で40秒の短時間熱処理を行った. 強ひずみ加工で形成した粒界は過剰な転位を有する非平衡粒界と考えられており, この熱処理により過剰な転位は回復し, 平衡粒界に変化すると考えられる. さらに比較として, ECAP加工しない0パス材, 加工硬化を目的とした1パス材を評価した. SCC試験は, I型試験片により室温(約290K), 14%NH_3雰囲気中に一定ひずみのもとで24時間放置した後のき裂長さを評価した
SCC試験の結果, 8パスした超微細結晶材は0パス材、1パス材に比べて、σ/σys(σは負荷応力,σysは0.2%耐力)が低い値でき裂の発生が確認された. また、ECAP加工後の短時間熱処理によりき裂が発生する応力が高くなり、SCC感受性が低下することが明らかとなった. ECAP加工などの強ひずみ加工では結晶粒の微細化とともに結晶粒界が非平衡となり、粒界エネルギが高くなったことがSCC感受性の高まった原因だと考えられる. なと、熱的安定性については有意な差は確認されなかった

Report

(3 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • Research Products

    (12 results)

All 2008 2007

All Journal Article (6 results) (of which Peer Reviewed: 3 results) Presentation (6 results)

  • [Journal Article] Corrosion of ultrafine grained copper fabricated by equal-channel angular pressing2008

    • Author(s)
      H. Miyamoto, K. Harada, T. Mimaki, A. Vinogradov and S.H ashimoto
    • Journal Title

      Corrosion Science vol.50

      Pages: 1215-1220

    • Related Report
      2008 Final Research Report
  • [Journal Article] Susceptibility to stress corrosion cracking in ammonia of nanostructured Cu-10wt%Zn alloy produced by severe plastic deformation2008

    • Author(s)
      H. Miyamoto, A. Vinogradov and S. Hashimoto
    • Journal Title

      Materials Science Forum Vol.584-586

      Pages: 887-892

    • Related Report
      2008 Final Research Report
  • [Journal Article] Susceptibility to stress corrosion cracking in ammonia of nanostrutctured Cu-10%Zn alloy produced by severe plastic def2008

    • Author(s)
      H. Miyamoto, A. Vinogradov, S. Hashimoto
    • Journal Title

      Materials Science Forum 584-586

      Pages: 887-892

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Coorosion of ultrafine grain copper fabricated by equal channel anglular2008

    • Author(s)
      H.Miyamoto, et. al.
    • Journal Title

      Corrosio Science 50

      Pages: 1215-1220

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Intergranular corrosion of ultrafine grain copper fabricated by ECAP2007

    • Author(s)
      H. Miyamoto, T. Mimaki, A. Vinogradov and S. Hashimoto
    • Journal Title

      Materials Science Forum Vol.561

      Pages: 2385-2388

    • Related Report
      2008 Final Research Report
  • [Journal Article] Intergranular corrosion of ultrafine grain copper fabricated by ECAP2007

    • Author(s)
      H.Miyamoto, et. al.
    • Journal Title

      Materials Science Forum 561-565

      Pages: 2385-2388

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] Susceptibility to stress corrosion cracking in ammonia of nanostrutctured Cu-10%Zn alloy produced by severe plastic def2008

    • Author(s)
      H. Miyamoto, A. Vinogradov, S. Hashimoto
    • Organizer
      4^<th> international conference of severe plastic deformation (nano SPD-4)
    • Place of Presentation
      ゴスラー、ドイツ
    • Year and Date
      2008-08-18
    • Related Report
      2008 Annual Research Report
  • [Presentation] Susceptibility to stress corrosion cracking in ammonia of nanostructured Cu-10wt%Zn alloy produced by severe plastic deformation2008

    • Author(s)
      H. Miyamoto, A. Vinogradov and S. Hashimoto
    • Organizer
      4th international conference on nanomaterials by severe plastic deformation
    • Related Report
      2008 Final Research Report
  • [Presentation] ターフェル法による超微細結晶銅の腐食電流の推定2007

    • Author(s)
      池内 貞之, 宮本 博之, ら
    • Organizer
      日本材料学会第56期学術講演会
    • Place of Presentation
      名古屋大学
    • Year and Date
      2007-05-20
    • Related Report
      2007 Annual Research Report
  • [Presentation] ターフェル法による超微細結晶銅の腐食電流の推定2007

    • Author(s)
      池内貞之、宮本博之、御牧拓郎、橋本敏、A. Vinogradov
    • Organizer
      日本材料学会第56期学術講演会
    • Related Report
      2008 Final Research Report
  • [Presentation] Stress corrosion cracking of nanostructured Cu-10wt%Zn alloy in ammonia2007

    • Author(s)
      H. Miyamoto, T. Mimaki, A. Vinogradov, S. Hashimoto
    • Organizer
      XII International Conference on Intergranular and Interphase Boundaries in Materials
    • Related Report
      2008 Final Research Report
  • [Presentation] Intergranular corrosion of ultrafine grain copper fabricated by ECAP2007

    • Author(s)
      H. Miyamoto, T. Mimaki, A. Vinogradov and S. Hashimoto
    • Organizer
      PRICM-6 (6th Pacifo Rim Conference on Materials)
    • Related Report
      2008 Final Research Report

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Published: 2007-04-01   Modified: 2016-04-21  

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