Stress Corrosion Cracking Behavior of Al-xMg-3.1Zn Aluminum Alloys and Its Mechanism

被引：0

作者：

Ding, Qingwei ^{[1
]}

Zhang, Di ^{[1
]}

Liu, Haoran ^{[1
]}

Zhang, Jishan ^{[1
]}

机构：

[1] State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing,100083, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2020年 / 49卷 / 05期

关键词：

Residual stresses - Ternary alloys - Dissolution - Magnesium alloys - Hydrogen - Cracks - Grain boundaries - Strain rate - Stress corrosion cracking - Tensile testing - Hydrogen embrittlement - Zinc alloys - Aluminum corrosion;

D O I：

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学科分类号：

摘要：

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 cracking process of the alloy was studied by the macro- and micro-fracture observation. The mechanism of stress corrosion cracking was analyzed and the effect of Mg on the cracking behavior was illuminated. The results show that the stress corrosion cracking occurs in the studied alloys, and the corrosion susceptibility decreases with the decrease in Mg content. This is directly related to the weakening of the anodic dissolution of grain boundary precipitates and hydrogen embrittlement behaviors caused by the decrease in Mg content. Wherein, the fact that the precipitate phase amount decreases with the decrease in the Mg content plays a critical role. © 2020, Science Press. All right reserved.

引用

页码：1601 / 1606