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实验铸造了Mg-9Li-3Al-x Si(x=0,0.1,0.5,1.0,质量分数,%)合金并通过OM,SEM,XRD和力学性能测试对其进行了研究。结果表明:铸态Mg-9Li-3Al合金组织中主要由α-Mg、β-Li、Mg_(17)Al_(12)相组成。加入Si后,合金中出现了新相Mg2Si,晶粒得到了明显细化,且Si能够抑制Mg_(17)Al_(12)的形成;当合金中的Si含量过高时,α-Mg相粗化,且会在相界处出现块状和汉字状的Mg_2Si相。合金的强度随着Si含量的增加呈现先增加后降低的趋势,合金的延伸率随着Si含量的增加呈现逐渐降低的趋势。当合金中Si含量为0.1%时,抗拉强度达到最大值182.5 MPa,延伸率为12.1%。
The alloy Mg-9Li-3Al-xSi (x = 0,0.1,0.5,1.0, mass fraction,%) was experimentally cast and investigated by OM, SEM, XRD and mechanical properties. The results show that the as-cast Mg-9Li-3Al alloy consists mainly of α-Mg, β-Li and Mg_ (17) Al_ (12) phases. After addition of Si, a new phase Mg2Si appears in the alloy, the grain is obviously refined, and Si can restrain the formation of Mg_ (17) Al_ (12). When the content of Si in the alloy is too high, And will appear in the phase boundary block and Chinese-shaped Mg_2Si phase. The strength of the alloy increases with the increase of Si content and then decreases. The elongation of the alloy shows a decreasing trend with the increase of Si content. When the content of Si in the alloy is 0.1%, the maximum tensile strength reaches 182.5 MPa and the elongation reaches 12.1%.