Selected Topics on Material Strength and Thermally Activated Deformation Processes

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  • Kato Masaharu
    Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

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Other Title
  • 材料強度と熱活性化変形過程に関する若干の考察
  • 第59回本多記念講演 材料強度と熱活性化変形過程に関する若干の考察
  • ダイ59カイ ホンダ キネン コウエン ザイリョウ キョウド ト ネツ カッセイカ ヘンケイ カテイ ニ カンスル ジャッカン ノ コウサツ

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Description

Thermally activated deformation processes are discussed with reference to the studies done by the present author and his coworkers. First, dislocation motion in one- and two-dimensional periodic stress fields is analyzed to understand the deformation mechanisms of bcc metals and spinodally decomposed alloys. The role of the thermally activated kink-pair formation on the temperature and strain-rate dependence of strength is also discussed. Secondly, diffusion-controlled processes pertinent to high-temperature deformation are discussed by applying a unified and fundamental rate equation derived previously. Thirdly, mechanisms for the temperature and strain-rate dependence of polycrystals and ultrafine-grained and nanocrystalline materials are introduced. A proposed model taking into account the thermally activated dislocation depinning at grain boundaries is discussed.

Journal

  • Materia Japan

    Materia Japan 53 (5), 209-214, 2014

    The Japan Institute of Metals and Materials

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