采用慢应变速率拉伸试验研究了单级和双级时效态 Al-Zn-Mg-Zr-Sc 合金在不同应变速率以及不同腐蚀介质条件下的应力腐蚀开裂(SCC)敏感性，观察了断口形貌，讨论了应变速率和时效状态对合金SCC敏感性的影响。结果表明：应变速率和时效状态对合金 SCC 敏感性的影响很大，低应变速率下合金的SCC敏感性指数均大于高应变速率下的；单级时效态合金的应力腐蚀敏感性指数均大于双级时效态合金的；合金经双级时效处理后，晶界沉淀相粗化，可有效降低吸附于晶界的氢原子浓度，使合金的耐应力腐蚀性能提高。
The stress corrosion cracking (SCC)susceptibility of Al-Zn-Mg-Zr-Sc alloy at single-stage and two-stage aging states was investigated by slow strain rate tension (SSRT)tests at different strain rates and corrosion mediums.The fracture morphology of the tested alloy was observed,and the effects of strain rate and aging state on SCC sensitivity of the tested alloy were discussed.The results show that strain rate and aging state had severe influences on SCC susceptibility of the tested alloy.At lower strain rate,the alloy was more sensitive to stress corrosion.SCC susceptibility index of single-stage aged alloy was larger than that of two-stage aged alloy. After two-stage aging treatment,the coarsening of precipitates at the grain boundaries could effectively reduce the concentration of hydrogen atoms adsorption on grain boundary and increase the stress corrosion resistance of the alloy.
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