Mg-(9,11)Li-1Sn镁锂合金的显微组织及力学性能

Microstructure and Mechanical Properties of Mg-(9,11)Li-1Sn Alloy

采用真空感应熔炼技术制备了Mg-(9,11)Li-1Sn两种镁锂合金,采用ICP分析了合金的实际元素含量,利用OM、SEM、XRD、EDS分析了两种合金的显微组织,并对合金进行了拉伸性能测试。结果表明,Sn对镁锂合金具有较强的固溶强化作用,且能够降低Mg在Li中的固溶度,将单β相出现的界线推向更高锂含量方向,LS91和LS111两种镁锂合金均由α相、β相和Mg2Sn组成,LS111合金的强度和伸长率均高于LS91合金。铸态LS91和LS111合金的抗拉强度和伸长率分别为126.08 MPa、23.92%,134.73 MPa、26.31%。

Abstract： Two kinds of Mg-Li alloys, Mg-（9, 11） Li-lSn, were prepared by vacuum induction melting method, the actual content of Li and Sn were analyzed by ICP. Microstructures of two alloys were analyzed by using OM, SEM, XRD and EDS, the mechanical properties were studied by tensile test. The results show that Sn has a strong solid solution strengthening effect on Mg-Li alloy, and can reduce the solubility of Mg in Li, and promote the boundary of the single phase to higher lithium content. The two alloys are composed of ot phase, 13 phase and Mg2Sn, the strength and the elongation of the LS111 alloy were higher than that of LS91 alloy. The tensile strength and elongation of the as-cast LS91 and LS 111 alloys were 126.08 MPa, 23.92% and 134.73 MPa, 26.31%