采用锂盐熔剂保护法熔铸Mg-8Li-4Zn-3Y合金，并对合金进行T4固溶和T6固溶+时效热处理，探讨了热 处理对Mg-8Li-4Zn-3Y 合金组织及硬度的影响。 结果表明，T4固溶后，组织中的强化相减少，α-Mg相晶粒尺寸增大，形 貌亦变得不规则，合金的硬度下降；再经过T5时效后，组织中又析出一些强化相颗粒，合金的硬度有一定程度的提高。 压缩过程中，Mg-8Li-4Zn-3Y 合金试样均呈鼓形后开裂，且均呈45°的剪切断裂。

As-cast ingot of Mg-8Li-4Zn-3Y alloy was prepared by fused salt protection in electric-resistance furnace. T4 solid solution and T6 solid solution + aging treatment were carried out on the alloy, and the effects of heat treatment on the microstructure and hardness of Mg-8Li-4Zn-3Y alloy were discussed. The results show that after T4 solid solution, the strengthening phase in the structure decrease, the grain size of alpha-mg phase increase, the morphology become irregular, and the hardness of the alloy decrease. After T5 aging, some reinforced phase particles are precipitated in the structure, and the hardness of the alloy is improved to a certain extent. During the compression process, the Mg-8Li-4Zn-3Y alloy samples all cracked after being drum-shaped and show a shear fracture of 45°.