Microstructure,Texture and Mechanical Properties of AZ80 Magnesium Alloy Processed by Cyclic Expansion-extrusion
XUE Yong1, WU Yaojin2, YANG Zhihui2, ZHANG Zhimin1
1 College of Materials Science and Engineering, North University of China, Taiyuan 030051; 2 College of Mechanical and Electrical engineering, North University of China, Taiyuan 030051
Abstract: The CEE deformation process was conducted on AZ80. The microstructure and texture were observed and the mechanical properties were measured.The results showed that the grain size has been significantly refined after CEE deformation. After four-pass, the grain size refined from 150-230 μm to 2 μm, and the grains presented equiaxied and uniform. After two-pass, with the increase of passes, the degree of grain refinement reduced slowly. Simultaneously, after CEE, AZ80 magnesium alloy texture consisted of two different fiber texture: (0001) plane paralleled to the extrusion direction and (1120) prism which is perpendicular to the compression direction. With the increase of extrusion passes, the overall intensity of texture decreased firstly, then increased and finally decreased. Compared with the homogeneous state, the mechanical properties has obvious various. After one-pass CEE deformation, the tensile strength and yield strength reach the maximum value, and the value was 290 MPa and 180 MPa, respectively. After two-pass of CEE deformation, the strength is not enhanced with grain refinement (anti Hall-Petch theory). This is because the softening effect of texture is stronger than that of grain refinement. The elongation increases with the increase of extrusion passes.
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2017, Vol. 31 
