The strength, stress corrosion cracking (SCC), and microstructure of four typical new generation 7000 series aluminium alloys (AA7037, AA7097, AA7056, and AA7085) under three-stage aging heat treatment have been investigated. The results showed that AA7085 exhibited the highest SCC resistance while AA7037 displayed the lowest SCC resistance. In addition, AA7056 presented the higher strength and SCC resistance compared with AA7037. The more susceptible to SCC of new generation 7000 series aluminium alloys was mainly ascribed to the high Zn and low Cu content in grain boundary precipitates. The results provided a new insight for the composition design of new generation 7000 series aluminium alloys.

研究了四种典型的新一代 7000 系列铝合金（AA7037、AA7097、AA7056 和 AA7085）在三级时效热处理下的强度、应力腐蚀开裂（SCC）和显微组织。结果表明，AA7085 表现出最高的 SCC 抗性，而 AA7037 表现出最低的 SCC 抗性。此外，与AA7037相比，AA7056表现出更高的强度和抗SCC性。新一代 7000 系列铝合金更容易发生 SCC，主要归因于晶界析出物中的高 Zn 和低 Cu 含量。研究结果为新一代 7000 系列铝合金的成分设计提供了新思路。