The Effect of Sn on Microstructure and Mechanical Properties of Mg-Li-Zn-Sn Alloys

Cheng Ji Jin; Rui Zhi Wu; Jing Huai Zhang; Mi Lin Zhang

doi:10.4028/www.scientific.net/AMR.650.185

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The Effect of Sn on Microstructure and Mechanical Properties of Mg-Li-Zn-Sn Alloys

Abstract:

The microstructure and tensile properties of the as-cast and as-extruded Mg-12Li-1Zn-xSn (x=1, 3, 5, 8, wt.%) alloys were investigated. The alloys are mainly composed of β-Li phase, Mg₂Sn phase. With the increase of Sn content, the microstructure of as-cast alloys is refined. After extrusion processing, grain size is obviously refined, and the Mg2Sn phase is broken into tiny particles. The elevated-temperature tensile behavior of the alloy was investigated at 373~523k under the strain rate of 1×10^-2~1.7×10^-4s^-1. The results indicate addition of Sn can improve the strength and plasticity, when the content of Sn is 5.0 wt.%, the as-extruded alloy possesses good superplasticity, which obtains the maximum elongation of 134.4% under a low strain rate of 1.0×10^-3s^-1 at 523K.