Microstructure and tensile properties of as extruded and as aged Mg–Al–Zn–Mn–Sn alloy

Abstract

The effect of 0–4 wt-% Sn addition on the microstructure and tensile properties of AZ80 alloys was investigated. The results indicated that Mg₂Sn particles were barely formed during the extrusion process until the content of Sn is >2 wt-%. The dislocation density in alloys after extrusion declined with the addition of Sn due to the promotion of dynamic recrystallisation after adding Sn. In aging treatment, Mg₁₇Al₁₂ precipitates were promoted by Sn and the phases distributed uniformly at low density level of dislocation. The AZ80-2 wt-% Sn alloy possessed the excellent tensile properties in as extruded and as aged state.

Keywords:

• Magnesium alloy
• Age hardening
• X-ray diffraction analysis
• Precipitation kinetic
• Mechanical property

Acknowledgements

This work was sponsored by the National Great Theoretic Research Project (2013CB632200), the International Cooperation Project (2010DFR50010), the Chongqing Science &Technology Support Project (CSTC2013jcyjC60001) and the Sharing Fund of Chongqing University’s large scale equipment.