Superplasticity of AZ31 magnesium alloy processed by severe plastic deformation

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  • XING Jie
    Graduate Student, Department of Mechanical Engineering and Intelligent System, The University of Electro-Communications
  • YANG Xuyue
    Department of Mechanical Engineering and Intelligent System, The University of Electro-Communications
  • MIURA Hiromi
    Department of Mechanical Engineering and Intelligent System, The University of Electro-Communications
  • SAKAI Taku
    Department of Mechanical Engineering and Intelligent System, The University of Electro-Communications

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Other Title
  • 大ひずみ加工ＡＺ３１マグネシウム合金の超塑性変形
  • ダイヒズミ カコウ AZ31 マグネシウム ゴウキン ノ チョウソセイ ヘンケイ

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Abstract

Low temperature superplasticity was studied in a fine-grained magnesium alloy AZ31 which was processed by multi-directional forging (MDF) under decreasing temperature conditions. Tensile specimens were machined from MDFed Mg alloy parallel to the final compression axis. Tensile tests were carried out at temperatures from 393 K to 473 K and at various strain rates. Superplasticity appears even at 393 K with a stress exponent of around 5.6 and a total elongation of 370%. The relative large stress exponent can be connected with grain coarsening or refinement taking place during deformation. The initial texture introduced by MDF hardly changes during deformation. These suggest that grain boundary sliding can take place during superplasticity, while grain rotation hardly occurs.

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