Adding 0.2 % mixed rare earths to Al-Zn-Mg-Cu alloy can enhance strength and plasticity, increase the ageing strengthening effect, and improve corrosion resistance and heat treatable performance of the alloy. 在Al-Zn-Mg-Cu合金中加入0.2%的混合稀土可提高强度和塑性,提高时效强化效果,改善热处理工艺性和耐蚀性。