通过合金成分的改变并加入0.05%富镧混合稀土制备了新型高铝锌基合金,并对该合金铸态条件下显微组织、力学性能、热膨胀系数进行了试验研究。结果表明:新型高铝锌合金具有比传统的ZA27更细小的显微组织,更高的强度、硬度和较小的热膨胀系数;稀土的加入不仅对合金强度、硬度和热膨胀系数而且对合金塑性改善均有有益作用。 A new high-Al-Zn-based alloy was prepared by changing the composition of the alloy and adding 0.05% La-rich rare earth. The microstructure, mechanical properties and thermal expansion coefficient of the alloy were investigated. The results show that the new high-aluminum-zinc alloy has finer microstructure, higher strength, hardness and smaller coefficient of thermal expansion than the traditional ZA27. The addition of rare earth not only improves the strength, hardness and thermal expansion coefficient but also improves the ductility of the alloy All have beneficial effects.