为了找到一种可以显著提高镁锂合金强度的工艺,根据镁-锂二元合金相图及铝元素在合金中的作用,设计了一种α(Mg)、β(Li)两相共存的镁锂合金(Mg-6Li-3Al),并进行了挤压和轧制;用光学显微镜和X射线衍射仪对合金不同状态的组织及性能进行了研究.结果表明：该合金挤压后在300 ℃轧制具有比较理想的组织,晶粒动态再结晶进行得比较完全,大小相对均匀,第二相颗粒有规律地分布在晶界处;合金的抗拉强度达到了280 MPa,伸长率也达到了13%,具有较高的强度和较好的塑性.

In order to find a technique that can obviously improve the strength of magnesium-lithium alloy,an alpha-beta biphase coexistent magnesium-lithium alloy was designed according to the Mg-Li phase diagram and the effect of Al.The alloy was extruded and rolled.The microstructure and properties of the alloy in different states were systematically investigated by optical microscope and XRD.The results show that the microstructure of as extruding-rolling at 300 ℃ is satisfying.The dynamic recrystallization proceed comparatively completely.The grain size become relatively uniform.The second-phase particles regularly distribute at the grain boundaries.The tensile strength and elongation of the alloy respectively reach 280 MPa and 13%,which indicates that it has relatively high strength and good plasticity.