Refinement and Coarsening of Grains Caused by Tensile-Shear Tests in Ultra-Fine Grained Cu Processed by Severe Plastic Deformation

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  • Matsutani Ryosuke
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Miyajima Yoji
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Onaka Susumu
    Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology

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Other Title
  • 巨大ひずみ加工により作製された超微細粒銅の引張せん断試験での結晶粒の微細化と粗大化
  • キョダイヒズミ カコウ ニ ヨリ サクセイ サレタ チョウビサイリュウ ドウ ノ ヒッパリ セン ダンシケン デ ノ ケッショウリュウ ノ ビサイカ ト ソダイカ

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Abstract

<p>Ultra-fine grained pure copper fabricated by equal-channel angular pressing was used as a sample. We made tensile-shear tests using specimens with notches cut from the sample and large shear deformation occurred between the notches. Microstructural changes between the notches caused by the large shear deformation were observed. Using micro scale lattices scribed on the surface of the specimen, we found both refinement and coarsening of grains caused by the large shear deformation. Although severe plastic deformation causes ultra-fine grained structure, it is known there is a limit of the grain refinement. The grain coarsening observed in the present study is considered to be the reason of the limit of the grain refinement caused by severe plastic deformation.</p>

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