FAN Xiaowei1,2, ZHANG Dingfei1,2, FENG Jingkai1,2, JIANG Luyao1,2,XU Junyao1,2, PAN Fusheng2,3
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400045; 2 National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044; 3 Chongqing Academy of Science and Technology, Chongqing 401123
Abstract: Extrusion of as-cast AZT802 alloy was performed in the temperature of 350 ℃, 380 ℃ and 400 ℃, and then the extruded alloys were given T5 aging treatment. The effects of extrusion temperature on microstructure and mechanical properties of extruded and aged AZT802 alloy were investigated. It was found that fine equiaxed grains were obtained in alloys extruded at higher extrusion temperature. With the extrusion temperature decreasing to 350 ℃, the distribution of grain size was nonuniform. The volumes of the second phases decrease with the extrusion temperature increasing. Moreover, the particle second phases distribute along the grain boundaries homogeneously at higher extrusion temperature. While large band-shaped precipitation was observed in the alloy extruded at 350 ℃. After T5 aging treatment, Mg2Sn particles distribute homogeneously. Both continuous and discontinuous Mg17Al12 phases were observed. The volume fraction of discontinuous Mg17Al12 phase increased with the extrusion temperature rising. The AZT802 alloy extruded at 380 ℃ and aged at 175 ℃ for 3 h possessed the best mechanical properties.
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2017, Vol. 31 
