High-strength heat-deformation-resistant rare earth aluminum alloy and preparation method thereof

The invention discloses a high-strength heat-deformation-resistant rare earth aluminum alloy and a preparation method thereof, and belongs to the field of rare earth aluminum alloy manufacturing, and the high-strength heat-deformation-resistant rare earth aluminum alloy comprises the following substances in percentage by mass: 5.0-7.0% of Zn, 2.0-3.0% of Mg, 1.0-2.0% of Cu, 0.3-0.6% of Er, 0.3-0.9% of Cr and the balance of Al and impurities. According to the high-strength heat-deformation-resistant rare earth aluminum alloy provided by the invention, the rare earth element capable of remarkably refining the alloy through grains is added, so that the mechanical property, especially the heat resistance, of the aluminum alloy is greatly improved, and therefore, the high-strength heat-deformation-resistant rare earth aluminum alloy has good application and popularization prospects and can be applied to the low-cost civil fields such as electric buses and rail transit. 一种高强度耐热变形稀土铝合金及其制备方法，属于稀土铝合金制造领域，包括如下质量百分比的物质