采用固液混合铸造工艺制备了AL-20CU合金,并利用光学显微镜和扫描电镜等手段对合金的组织和性能进行了研究。结果表明,合金中的Α-AL晶粒明显细化,Α-AL晶粒尺寸控制在100ΜM以内,粗大的枝晶消除,晶粒呈球状形貌;合金的CUAL2-AL(CU)共晶组织片间距减小;合金的力学性能显著提高。与普通铸造相比,抗拉强度由112MPA提高到205MPA,伸长率由0.5%提高到3.5%。 AL-20CU alloy was prepared by solid-liquid mixed casting process, and the microstructure and properties of the alloy were studied by means of optical microscope and scanning electron microscope. The results show that the grain size of Α-AL is controlled to less than 100 μM. The coarse dendrites are eliminated and the grains are spherical. The CUAL2-AL (CU) eutectic microstructure Film spacing decreases; the mechanical properties of the alloy increased significantly. Compared with ordinary casting, tensile strength increased from 112MPA to 205MPA, elongation increased from 0.5% to 3.5%.