AZ31マグネシウム合金押出材の超塑性特性 Superplastic characteristics in an extruded AZ31 magnesium alloy

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Deformation characteristics at elevated temperatures were examined in an AZ31 magnesium alloy. The asreceived bar was extruded for refineing its microstructure. The extruded alloy had equiaxed grains with an average grain size of ∼5 μm. Tensile test revealed that the material exhibited superplasticity. The maximum elongation of 608% was obtained at a temperature of 598 K and at a strain rate of 1 × 10<sup>−4</sup> s<sup>−1</sup>. Microstructural observations indicated that the dominant deformation process was grain boundary sliding. The strain rate sensitivity exponent in the superplastic region was 0.5 and the activation energy was close to that for grain boundary diffusion in magnesium. Experimental results suggested that the dominant deformation mechanism in AZ31 was grain boundary sliding accommodated by dislocation glide controlled by grain boundary diffusion.

収録刊行物

  • 軽金属

    軽金属 49(8), 401-404, 1999-08-30

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10002666870
  • NII書誌ID(NCID)
    AN00069773
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04515994
  • NDL 記事登録ID
    4835130
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-284
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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