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丁清伟,张迪,刘浩然,张济山.Al-xMg-3.1Zn铝合金的应力腐蚀开裂行为及其机制[J].稀有金属材料与工程(英文),2020,49(5):1601~1606.[Qingwei Ding,Di Zhang,Haoran Liu and Jishan Zhang.The stress corrosion cracking behavior of Al-xMg-3.1Zn aluminum alloys[J].Rare Metal Materials and Engineering,2020,49(5):1601~1606.]
The stress corrosion cracking behavior of Al-xMg-3.1Zn aluminum alloys
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Received:September 18, 2019  Revised:November 05, 2019
Key words: Al-Mg-Zn aluminum alloy  stress corrosion cracking  fracture analysis  anodic dissolution  hydrogen embrittlement
Foundation item:国防科技创新特区资助,现代交通金属材料与加工技术北京实验室资助,国家自然科学基金51571013、51971019。
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Qingwei Ding,Di Zhang,Haoran Liu and Jishan Zhang  
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      The stress corrosion cracking and hydrogen embrittlement of the Al-xMg-3.1Zn aluminum alloys were studied by slow strain rate tensile tests and dynamic electrolytic hydrogen charging experiments, respectively. The effect of Mg on the stress corrosion cracking behaviors was indicated combining with transmission electron microscopy and fracture analysis. The results showed that the stress corrosion cracking was happened in the studied alloys, and the corrosion susceptibility decreased with a decrease of Mg content due to the decrease of the grain boundary precipitates continuity. This was result from the decrease in the anodic dissolution of grain boundary precipitates and hydrogen embrittlement behaviors with a decrease of Mg content.