Microstructure and mechanical properties of as-extruded AZ80–xSn magnesium alloys

Abstract

The effect of 0–2 wt-% Sn addition on AZ80 magnesium alloys after 350°C extrusion has been studied by analysing microstructure and mechanical properties. The results indicated that dynamically recrystallised grains were fine and homogeneous with less than 1 wt-% Sn addition. In AZ80–0.5Sn alloy, a large number of Mg₁₇Al₁₂ precipitated phases formed in grains and at grain boundaries during extrusion process. With more than 1 wt-% Sn addition, the size of dynamically recrystallised grains increased and the number of Mg₁₇Al₁₂ phases decreased. The strength of as-extruded AZ80–0.5Sn alloy enhanced largely as compared with that of the as-extruded AZ80 alloy. AZ80–0.5Sn alloy had the outstanding tensile and compressive properties.

Keywords:

• Magnesium alloy
• Dynamic recrystallisation
• Microstructure
• Mechanical properties
• Mg–Al–Sn–Zn–Mn alloy

Acknowledgements

This work was sponsored by National Great Theoretic Research Project (2013CB632200); National Natural Science Foundation of China (51474043); Chongqing Municipal Government Project (CSTC2013JCYJC60001); Education Commission of Chongqing Municipality (KJZH14101); Sharing fund of Chongqing University's large-scale equipment.