分析了近年来超高强度Al-Zn-Mg-Cu系铝合金的成分设计、工艺优化、显微组织分析、力学性能测试及微量元素的作用,对今后的发展动向提出了一些新的看法:采用传统铸造技术得到的铝合金,Zn含量的最大值在8wt%左右,抗拉强度低于700MPa;采用喷射成形技术,Zn含量最大值能够超过12wt%,同时抗拉强度可达800MPa以上,大大提高了铝合金的强度;超高强度铝合金的固溶强化相主要为MgZn2相;经回归时效处理(RRA)后,合金同时具有T6的强度和T7X的抗应力腐蚀性能;微量元素对超高强度铝合金的组织和性能具有显著的影响.
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