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2009 Fiscal Year Final Research Report

Enhancement of fatigue properties of Al-Mg and Al-Mg-Si alloys at elevated temperatures by addition of small amount of Scandium

Research Project

  • PDF
Project/Area Number 19760063
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Materials/Mechanics of materials
Research InstitutionKanazawa University

Principal Investigator

WATANABE Chihiro  Kanazawa University, 機械工学系, 准教授 (60345600)

Project Period (FY) 2007 – 2009
Keywords機械材料 / 金属疲労 / Sc含有Al合金
Research Abstract

The effects of small amount of Sc addition on the fatigue properties of Al-Mg and Al-Mg-Si alloys at elevated temperatures have been examined. Cyclic softening after initial hardening is found in the Al-Mg alloys with small Al_3Sc particles, but no cyclic softening takes place in the alloys with larger particles. The cyclic softening is explained by a loss of particle strengthening through particle shearing within strongly strained slip bands. The larger Al_3Sc particles have a stronger retardation effect on the formation of fatigue-induced stable dislocation structure than small particles even at a high temperature. After peak-aging treatments, the Al-Mg-Si alloys has fine lath-shaped β' precipitates. In the Sc-containing Al-Mg-Si alloy, spherical Al_3Sc precipitates of about 11 nm in diameter are co-existed. The Al-Mg-Si alloy with Sc exhibits cyclic hardening to saturation, while the alloy without Sc shows clear cyclic softening after initial hardening. In the Sc-bearing Al-Mg-Si alloy, owing to the existence of non-shearable Al_3Sc precipitates, dislocations were uniformly distributed, resulting in the improvement of fatigue life.

  • Research Products

    (12 results)

All 2010 2009 2008 2007 Other

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (7 results)

  • [Journal Article]2010

    • Author(s)
      C. Watanabe, D. Watanabe, T. Tanii, R. Monzen
    • Journal Title

      Philosophical Magazine Letters 90

      Pages: 1347-1358

    • Peer Reviewed
  • [Journal Article]2008

    • Author(s)
      C. Watanabe, R. Monzen, K. Tazaki
    • Journal Title

      International Journal of Fatigue 30

      Pages: 635-641

    • Peer Reviewed
  • [Journal Article]2007

    • Author(s)
      D. Watanabe, C. Watanabe, R. Monzen
    • Journal Title

      Materials Transactions 48

      Pages: 1571-1574

    • Peer Reviewed
  • [Journal Article]

    • Author(s)
      C. Watanabe, R. Monzen
    • Journal Title

      Material Science Forum (in press)

    • Peer Reviewed
  • [Journal Article]

    • Author(s)
      C. Watanabe, R. Monzen
    • Journal Title

      Journal of physics CS (in press)

    • Peer Reviewed
  • [Presentation] Al-Sc系合金中のAl3Sc粒子の粗大化成長2009

    • Author(s)
      渡邊千尋
    • Organizer
      日本軽金属学会第117会講演大会
    • Place of Presentation
      電気通信大学(東京都)
    • Year and Date
      2009-11-15
  • [Presentation] Fatigue behavior and microstructure of an Al-Mg-Sc alloy at an elevated temperature2009

    • Author(s)
      C. Watanabe, R. Monzen
    • Organizer
      The 15th International Conference on the Strength of Materials
    • Place of Presentation
      Technische Univerrsitat Dresden (Germany)
    • Year and Date
      2009-08-18
  • [Presentation] Low-cycle fatigue and dislocation structure of Al-Mg alloy with Sc at elevated temperature2008

    • Author(s)
      Y. Ishino, C. Watanabe, R. Monzen
    • Organizer
      The 9th Asia-Pacific Microscopy Conference
    • Place of Presentation
      Jeju International Convention Center (Korea)
    • Year and Date
      2008-11-08
  • [Presentation] Al-Mg-Sc合金における高温疲労特性と微細組織2008

    • Author(s)
      石野嘉章, 渡邊千尋, 門前亮一
    • Organizer
      日本軽金属学会第117回秋期講演大会
    • Place of Presentation
      工学院大学(東京都)
    • Year and Date
      2008-11-06
  • [Presentation] Al-Mg-Sc合金の微視組織と高温疲労挙動2008

    • Author(s)
      渡邊千尋, 石野嘉章, 門前亮一
    • Organizer
      第57期日本材料学会講演大会
    • Place of Presentation
      鹿児島大学(鹿児島県)
    • Year and Date
      2008-05-25
  • [Presentation] 573Kにて時効されたAl-Mg-Sc合金におけるAl3Sc粒子の粗大化2007

    • Author(s)
      渡部大然, 渡邊千尋, 門前亮一
    • Organizer
      日本金属学会・2007年周期講演大会
    • Place of Presentation
      岐阜大学(岐阜県)
    • Year and Date
      2007-09-21
  • [Presentation] Al-Mg-Sc合金における高温疲労挙動と転位組織2007

    • Author(s)
      渡邊千尋, 石野嘉明, 門前亮一
    • Organizer
      日本金属学会・2007年秋期講演大会
    • Place of Presentation
      岐阜大学(岐阜県)
    • Year and Date
      2007-09-20

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Published: 2011-06-18   Modified: 2016-04-21  

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