用微量钪合金化的铝合金是新一代航天航空用结构材料。采用铸锭冶金法制备了该类Ａｌ－５Ｍｇ－（０．１０～０．３０）Ｓｃ－（０．０５～０．１５）Ｚｒ合金板材，测试了其不同状态下的拉伸力学性能σｂ、σ０．２和δ，采用金相显微镜和透射电镜观察分析了其不同状态下的显微组织结构。结果表明，该合金具有良好的强塑性，比不含钪的传统Ａｌ－５Ｍｇ合金强度提高了近７０～１５０ＭＰａ；微量Ｓｃ的添加显著细化了合金铸态的晶料尺寸和抑制了合金变形组织的再结晶，对合金起到了细晶强化和亚结构强化作用。 Alloyed with a trace of scandium aluminum alloy is a new generation of aerospace structural materials. The Al-5Mg- (0.10-0.30) Sc- (0.05-0.15) Zr alloy sheets were prepared by the ingot metallurgy method and their tensile mechanical properties σb, σ0.2 and δ, the microstructures of the composites under different states were observed by optical microscope and transmission electron microscope. The results show that the alloy has good ductility, which is about 70 ~ 150MPa higher than that of the conventional Al-5Mg alloy containing no scandium. The addition of trace amount of Sc significantly refined the size of as-cast alloy and inhibited the deformation of the alloy Of the recrystallization, the alloy played a fine grain strengthening and substructure strengthening effect.