采用光学显微镜(OM)、透射电镜(TEM)、扫描电镜(SEM)、维氏硬度计和力学性能测试等方法研究了Li元素对Al-3.5Cu-1.5Mg合金微观结构及性能的影响.结果表明:在Cu/Mg原子比约为1的Al-3.5Cu-1.5Mg实验合金中,加入1％(质量分数)的Li元素,主要时效析出相由S’(Al2CuMg)转变为S’(Al2CuMg)+δ'(A13 Li),晶界无沉淀析出带(PFZ)窄化；弹性模量提高了8GPa,抗拉强度提高了21MPa,伸长率由20.3％降至15.8％,由韧性断口转变为韧/脆混合型断口.
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