Al-Cu 合金因其高的强度、硬度及高温力学性能，在交通领域具有重要应用。 为探明高 Cu 含量铝合金力学性能特点，本文采用流变压铸成形 Al-15Cu 合金，研究浇注温度等参数对该合金流变压铸件力学性能的影响。 结果表明，随着浇注温度的增加，初生 α-Al 晶粒平均等效直径由 55 μm 降低到 30 μm ，而平均形状系数随浇注温度变化不明显；施加电磁搅拌对初生 α-Al 晶粒有一定的细化作用。 Al-15Cu 合金流变压铸件的强度和塑性随浇注温度先增加后降低。 浇注温度为 610 ℃ 和施加电磁搅拌条件下的拉伸试样密度、 抗拉强度和伸长率最高， 分别为 2.961 g/cm 3 、260 MPa 和 2% 。 在 300 ℃ 拉伸条件下，流变铸件性能随浇注温度变化的规律与常温时一致，抗拉强度和伸长率分别可达 118 MPa 和 8% 

Al-Cu alloys have important applications in the transportation field due to their high strength, hardness, and high-temperature mechanical properties. To clarify the mechanical characteristics of Al alloy with high Cu content, rheo-diecast Al-15Cu alloy was investigated to determine the influence of factors such as pouring temperature on the mechanical properties of rheo-diecast parts. The results show that with increasing casting temperature, the average equivalent diameter of the primary α-Al grains decreases from 55 μm to 30 μm, while no apparent change is shown in the average shape factor with respect to the casting temperature. The application of electromagnetic stirring has some effect on the refinement of the primary α-Al grains. The strength and elongation of the rheo-diecast Al-15Cu alloy parts increase and then decrease with increasing casting temperature. The density, tensile strength and elongation of the tensile specimens with a pouring temperature of 610 ℃ and electromagnetic stirring reach the highest values, which are 2.961 g/cm 3 , 260 MPa and 2%, respectively. At 300 ℃, the variation in the tensile properties of the rheo-diecast alloy with increasing pouring temperature is consistent with that at room temperature, and the highest tensile strength and elongation reach 118 MPa and 8%, respectively.