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采用真空感应熔炼炉制备了Mg-9Li-1X(Al,Zn,Sn)三种镁锂合金,利用OM、SEM、XRD分析了三种合金的显微组织和拉伸断口,并在室温下对铸态镁锂合金进行力学性能测试。试验结果表明:在镁锂合金中,Al易与Li形成稳定的化合物,而Sn、Zn易与Mg形成稳定的化合物;较Al、Zn而言,Sn对铸态Mg-9Li-1X合金的细化效果最明显,细化的α相弥散分布在基体中,因此LS91合金具有良好的综合性能;由于LA91合金中α相体积分数最高,所以LA91合金的强度最高,而LZ91合金由于晶粒粗大,其强度和伸长率均最低。
Three Mg-9Li-1X (Al, Zn, Sn) Mg-Li alloys were prepared by vacuum induction melting furnace. The microstructure and tensile fracture of the three alloys were analyzed by OM, SEM and XRD. Cast magnesium alloy for mechanical properties testing. The experimental results show that Al and Li form stable compounds in Mg-Li alloys, while Sn and Zn are easy to form stable compounds with Mg. Compared with Al and Zn, Sn is more effective than Mg in the as-cast Mg-9Li-1X alloy The most obvious effect is that the refined α phase dispersed in the matrix, so LS91 alloy has a good overall performance; LA91 alloy LA61 alloy highest strength due to the highest volume fraction, and LZ91 alloy due to coarse grains, Its strength and elongation are the lowest.