Microstructure and Mechanical Properties of Magnesium Alloy AZ31 Processed by Compound Channel Extrusion

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  • Lei Xiaofei
    College of Materials Science and Engineering, Chongqing University National Engineering Research Center for Magnesium Alloys, Chongqing University
  • Liu Tianmo
    College of Materials Science and Engineering, Chongqing University National Engineering Research Center for Magnesium Alloys, Chongqing University
  • Chen Jian
    College of Materials Science and Engineering, Chongqing University National Engineering Research Center for Magnesium Alloys, Chongqing University
  • Miao Bin
    College of Materials Science and Engineering, Chongqing University National Engineering Research Center for Magnesium Alloys, Chongqing University
  • Zeng Wen
    College of Materials Science and Engineering, Chongqing University National Engineering Research Center for Magnesium Alloys, Chongqing University

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We report microstructure evolution and mechanical properties of Mg alloy AZ31 processed by a new severe plastic deformation technique which combines forward extrusion, equal channel angular extrusion (ECAE) and change channel angular extrusion (CCAE). Under all of the processing temperatures ranging from 623 K to 723 K, the grain size of the as-extruded sample was remarkably refined, which is attributed to the grain subdivision and dynamic recrystallization during the drastic deformation. We have also found the strength and tension-compression asymmetry were improved. Simultaneously, micro-fracture of tensile exhibited the characteristics of ductility, indicating plasticity of Mg alloy AZ31 was improved by compound channel extrusion.

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