Al-xMg-3.1Zn铝合金的应力腐蚀开裂行为及其机制  

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

作　　者：丁清伟 张迪[1] 刘浩然 张济山[1] Ding Qingwei;Zhang Di;Liu Haoran;Zhang Jishan(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属材料与工程》2020年第5期1601-1606,共6页Rare Metal Materials and Engineering

基　　金：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)。

摘　　要：通过慢应变速率拉伸实验和动态电解充氢实验分别研究了Al-xMg-3.1Zn铝合金的应力腐蚀开裂行为及其氢脆行为。结合宏观断口和微观断口形貌分析研究了合金发生应力腐蚀开裂的进程。通过对合金应力腐蚀开裂的机制进行分析阐明了合金中Mg元素含量对合金应力腐蚀开裂行为的影响。结果表明:在该合金体系中存在应力腐蚀开裂,且合金的应力腐蚀敏感性随合金中Mg含量的降低而降低,这与合金的阳极溶解行为与氢脆行为随Mg元素含量降低而减弱有着直接的关系。在这当中,合金中晶界析出相的数量随Mg元素含量降低而减少起到了至关重要的作用。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.

关 键 词：Al-Mg-Zn铝合金 应力腐蚀开裂 断口分析 阳极溶解 氢脆 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.93[金属学及工艺—金属材料]