Dislocation Bow-Out Model for Yield Stress of Ultra-Fine Grained Materials

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著者

    • Kato Masaharu KATO Masaharu
    • Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • Fujii Toshiyuki FUJII Toshiyuki
    • Department of Innovative and Engineered Materials, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • Onaka Susumu [他] ONAKA Susumu
    • Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

抄録

A dislocation bow-out model has been developed to explain the strength of ultra-fine grained (UFG) materials with grain size roughly between 20 nm to 500 nm. In the model, perfect dislocations are assumed to be nucleated at grain-boundary sources and bow out between two pinning points on a boundary. Yielding is considered to occur when a dislocation takes a semi-circular shape under applied stress. Statistical consideration is introduced to evaluate the most probable pinning-point distance as a function of grain size. Comparison with experimental results is made for fcc UFG metals. It is found that yield stress as well as thermal activation parameters can be explained reasonably by the present theoretical model.

収録刊行物

  • Materials transactions  

    Materials transactions 49(6), 1278-1283, 2008-06-01 

    The Japan Institute of Metals and Materials

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各種コード

  • NII論文ID(NAID)
    10021147362
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    9519116
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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