In this study, we analyze the microstructure, phase composition, aging process, and a set of characteristics of the performance properties of new casting Al–4Zn–4Mg–4Cu–0.2Zr alloys doped with yttrium (Y) or erbium (Er). Doping with Y or Er has been shown to decrease hot brittleness, enhance corrosion resistance, and slightly decrease strength characteristics at up to 200° C. When alloyed with Y or Er, enhanced casting properties are ensured through an increase in the proportion of eutectics and modification of the grain structure. The Al₈Cu₄Y, (Al, Cu)₁₁Y₃, Al₈Cu₄Er, and Al₃Er phases containing Y and Er after homogenization at 465° C retain the shape of branched crystals, resulting in alloys with low ductility at up to 200° C. In all the alloys, after stretching at 250°C, the elongation considerably increases, and the yield strength is approximately the same and lies in the range of 217–222 MPa. Alloying with Y or Er results in less softening with increasing test temperature and considerably higher corrosion resistance under electrochemical corrosion conditions.

在本研究中，我们分析了掺钇 (Y) 或铒 (Er) 的新型铸造 Al-4Zn-4Mg-4Cu-0.2Zr 合金的显微组织、相组成、时效过程以及一系列性能特征。掺杂 Y 或 Er 已被证明可以降低热脆性，增强耐腐蚀性，并略微降低 200°C 以下的强度特性。当与 Y 或 Er 形成合金时，通过增加共晶和合金的比例，确保增强铸造性能。晶粒结构的改变。含有Y和Er的Al ₈ Cu ₄ Y、(Al,Cu) ₁₁ Y ₃、Al ₈ Cu ₄ Er和Al ₃ Er相在465℃均质化后保留了支化晶体的形状，导致合金的延展性较低在高达 200°C 的温度下。在所有合金中，在 250°C 拉伸后，伸长率显着增加，屈服强度大致相同，在 217-222 MPa 范围内。与 Y 或 Er 形成合金会随着测试温度的升高而减少软化，并在电化学腐蚀条件下显着提高耐腐蚀性。