通过OM、SEM、XRD和拉伸实验研究3种典型的Mg-Li-Al合金的铸态和挤压态组织及力学性能.结果表明:随着Li含量的增加,合金的结构从密排六方向体心立方转变,合金的铸态组织随之发生改变.经过250℃挤压处理后,Mg-5Li-1Al和Mg-9Li-1Al合金的晶粒沿挤压方向呈方向性排列,Mg-14Li-1Al合金由均匀的等轴晶(再结晶晶粒)组成.随着Li含量的增加,挤压态合金板材的屈服强度逐渐增大,其中挤压态Mg-9Li-1Al合金板材的综合力学性能最佳(屈服强度达到149 MPa,伸长率达到25％).
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