本文研究了两种 Mg 含量的 Al-Li-Mg-zr 合金组织结构及其性能。结果表明,Mg 是一重要的固溶强化元素,它对 Al-Li-Mg-Zr 合金时效硬化趋势没有影响;Mg 含量增加,合金在各时效状态下强度和硬度均提高,合金中析出的δ′相粗化速率加快。但塑性变化则正好相反,高 Mg合金延伸率较低,与其他时效制度相比,两合金在峰值时效时塑性最低。合金的拉伸断口为穿晶加沿晶混合形式。 In this paper, the microstructures and properties of two Mg-doped Al-Li-Mg-zr alloys were studied. The results show that Mg is an important solid solution strengthening element, which has no effect on the age hardening trend of Al-Li-Mg-Zr alloy. The Mg content increases and the strength and hardness of the alloy increase at all aging conditions. The δ Phase coarsening speed. However, the plastic change is just the opposite. The elongation of the high-Mg alloy is lower, and the plasticity of the two alloys is the lowest when compared with other aging systems. The tensile fracture of the alloy is transcrystalline and intergranular mixed form.