研究了锆对铸造铝锂合金组织及性能的影响。结果表明,微量锆能强烈地细化铝锂合金的铸态晶粒及枝晶组织,且对微观偏析有减轻作用;合金的拉伸性能随含锆量增加而大幅度改善:观察Al—Li—Cu铸造合金的时效组织发现,亚晶界PFZ是不连续的,对合金的断裂过程难以产生重大影响,参与断裂过程的主要是晶粒的晶界。同时还发现,锆在一定含量范围内增加时,能显著加快δ′相的时效过程,增加δ′相的体积份数。 The effect of zirconium on the microstructure and properties of cast Al-Li alloy was studied. The results show that the trace zirconium can refine the as-cast grains and dendritic microstructure of Al-Li alloy and reduce the microsegregation. The tensile properties of the alloy greatly improve with the increase of zirconium content. Al-Li The age structure of the Cu-Cu alloy shows that the PFZ of the subgrain boundaries is not continuous and hardly affects the fracture process of the alloy. The grain boundary of the grain is mainly involved in the fracture process. At the same time, it was also found that zirconium could accelerate the aging process of δ phase and increase the volume fraction of δ ’phase when it increased within a certain range.