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研究含Sn5%,8%,11%及Zn0.5%,1%,2%的Mg-xSn-yZn-1.0Al合金(质量分数)的显微组织演变和力学性能变化,在此基础上优化合金的成分比,得出在Sn:Zn=5:1和Sn:Zn=6:2.5时有较佳的综合力学性能。显微组织观察表明,Zn元素能够起到明显的晶粒细化作用,显著提高合金的抗拉强度,但过量的Zn会使合金的伸长率显著下降。Sn含量的增加可以明显地改善合金的树枝晶组织,并使其等轴化,但Sn含量的增加使合金的抗拉强度明显下降。同时增加Sn和Zn元素的含量时,Sn含量的变化成为合金组织演变的主要原因;减少Sn和Zn元素的含量时,Zn含量的变化成为合金组织演变的主要原因。
The microstructure evolution and mechanical properties of Mg-xSn-yZn-1.0Al alloy containing 5%, 8%, 11% Zn and 0.5%, 1% and 2% Zn were investigated. Based on this, Alloy composition ratio, come to Sn: Zn = 5: 1 and Sn: Zn = 6: 2.5 have better mechanical properties. Microstructure observation shows that Zn can obviously improve the grain refinement and increase the tensile strength of the alloy significantly. However, the excessive Zn can significantly reduce the elongation of the alloy. The increase of Sn content can obviously improve the dendritic structure of the alloy and make it equiaxed, but the increase of Sn content makes the tensile strength of the alloy decrease obviously. At the same time, the content of Sn and Zn increased at the same time, the change of Sn content became the main reason for the evolution of alloy microstructure. When the contents of Sn and Zn were reduced, the change of Zn content became the main reason for the evolution of alloy structure.