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借助OM、SEM、EDS、XRD和EPMA对Mg-4%Sn-(1.0~3.0)%Pb(质量分数)合金进行微观组织、物相和元素分析,采用万能试验机和显微硬度计测试其拉伸性能和硬度。结果表明,Pb的加入,抑制晶界上Mg2Sn相的析出,使得Mg2Sn相的数量减少并呈短棒状析出,合金的铸态组织由α-Mg和Mg2Sn相组成,Pb元素均匀分布在α-Mg和Mg2Sn相中。Pb添加量为2.5%时,合金的抗拉强度和伸长率均优于Mg-4%Sn合金的,分别达到了114.05 MPa和12.48%,Pb的加入使得合金的硬度降低。
The microstructure, phase and elemental analysis of Mg-4% Sn- (1.0-3.0)% Pb (mass fraction) alloy were investigated by means of OM, SEM, EDS, XRD and EPMA, and their alloys were tested by universal testing machine and microhardness tester Tensile properties and hardness. The results show that the addition of Pb suppresses the precipitation of Mg2Sn phase on the grain boundaries, resulting in a decrease in the number of Mg2Sn phases and precipitates in short rods. The as-cast microstructure of the alloys consists of α-Mg and Mg2Sn phases, and the Pb elements are uniformly distributed in α-Mg And Mg2Sn phase. When the additive amount of Pb is 2.5%, the tensile strength and elongation of the alloy are better than those of Mg-4% Sn alloy, reaching 114.05 MPa and 12.48% respectively. The addition of Pb makes the hardness of alloy decrease.