Sn对ZK60镁合金铸态组织与力学性能的影响

Effects of Sn on the As-Cast Microstructure and Mechanical Property of ZK60 Magnesium Alloy

摘要: 利用光学显微镜、扫描电子显微镜和X射线衍射仪分析了铸态ZK60和ZK60-0.083Sn合金的组织和相组成，并测试了其室温拉伸力学性能。结果表明，在ZK60合金中添加0.083% Sn后，铸态组织发生明显细化，同时添加的Sn固溶于α-Mg基体和MgZn₂相中，未生成含Sn的新相。室温拉伸力学性能显著提高，抗拉强度、屈服强度和伸长率分别达265 MPa、182 MPa和13.0%，较ZK60合金分别提高18%、52%和44%。

Abstract: Microstructures and phase compositions of as-cast ZK60 and ZK60-0.083Sn alloys were investigated by optical microscopy, scanning electron microscopy and X-ray diffraction. Meanwhile, the tensile mechanical property at ambient temperature was tested. The results show that the as-cast microstructure is refined obviously when 0.083% Sn is added into ZK60 alloy. Meanwhile, the added metal Sn dissolves into the α-Mg matrix and MgZn₂ phase, and no Sn-containing new phase precipitates. The tensile mechanical property at ambient temperature is enhanced significantly. The tensile strength, yield strength and elongation can reach 265 MPa, 182 MPa and 13.0% for ZK60-0.083Sn alloy, with the improving amplitude of 18%, 52% and 44% compared with the ZK60 alloy, respectively.