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Minor Sr was introduced to the Mg-3Sn-2Ca(wt.%) alloy in this paper, and the effects of minor Sr addition on the as-cast microstructure and mechanical properties of the Mg-3Sn-2Ca(wt.%) alloy were investigated by using of optical and electron microscopies, differential scanning calorimetry(DSC) analysis, and tensile and creep tests. The results indicate that, after adding 0.034wt.%, 0.065wt.% or 0.10wt.% Sr to the Mg-3Sn-2Ca alloy, the morphology of the primary CaMgSn phase changes from the initial coarse needle-like net to relatively fi ne short block and/or particle-like shapes. At the same time, the additions of 0.034wt.% or 0.065wt.% Sr suppress the formation of the primary CaMgSn phase, and the addition of 0.10wt.% Sr not only suppresses the formation of the primary and eutectic CaMgSn phases but also promotes the formation of Mg2Ca phase. Furthermore, the addition of minor Sr to the Mg-3Sn-2Ca alloy can improve the tensile properties of the alloy both at room temperature and 150 ℃. The creep property of the Mg-3Sn-2Ca alloy at 150 ℃ is also improved by the additions of 0.034wt.% and 0.065wt.% Sr; however, the addition of 0.10wt.% Sr is not benefi cial to the creep properties of the Mg-3Sn-2Ca alloy.
Minor Sr was introduced to the Mg-3Sn-2Ca (wt.%) Alloy in this paper, and the effects of minor Sr addition on the as-cast microstructure and mechanical properties of the Mg-3Sn-2Ca were investigated by using of optical and electron microscopies, differential scanning calorimetry (DSC) analysis, and tensile and creep tests. The results indicate that, after adding 0.034 wt.%, 0.065 wt.% or 0.10 wt.% Sr to the Mg- 3Sn-2Ca alloy, the morphology of the primary CaMgSn phase changes from the initial coarse needle-like net to relatively fi ne short block and / or particle-like shapes. The same time, the additions of 0.034 wt.% Or 0.065 wt .% Sr suppress the formation of the primary CaMgSn phase, and the addition of 0.10 wt.% Sr not only suppresses the formation of the primary and eutectic CaMgSn phases but also promotes the formation of Mg2Ca phase. the Mg-3Sn-2Ca alloy can improve the tensile properties of the alloy both at room temperature and 150 ° C. The creep property of the Mg-3Sn-2Ca alloy at 150 ° C. is also improved by the additions of 0.034 wt.% And 0.065 wt.% Sr; however, the addition of 0.10 wt.% Sr is not benefi cial to the creep properties of the Mg-3Sn-2Ca alloy.