以稀土元素Nd为变质剂,采用金属型铸造工艺制备铸造铝硅合金ZL101,并通过金相显微镜、扫描电镜、布氏硬度计和电子万能试验机研究变质时间及重熔次数对合金显微组织和力学性能的影响。结果表明,稀土Nd对合金具有较好的变质作用,并具有长效性和重熔性,变质6h及重熔4次后合金中的共晶硅组织仍呈小片状的变质状态,且合金硬度及拉伸性能均未受明显影响。变质不同时间及重熔不同次数的合金拉伸试样均为解理断裂。 Using rare earth element Nd as modifier, cast aluminum-silicon alloy ZL101 was prepared by metal casting process. The microstructure of the alloy was studied by metallographic microscope, scanning electron microscopy, Brinell hardness tester and electronic universal testing machine. And mechanical properties. The results show that the rare earth Nd has a good metamorphism and has long-lasting and remelting properties. The eutectic silicon structure in the alloy is still in the form of small deformation after 6h of remelting and remelting for 4 times, and the alloy Hardness and tensile properties were not significantly affected. At different times of metamorphism and different times of remelting alloy tensile specimens are cleavage fracture.