Influence of Precipitation Microstructure Change on the Stress Corrosion Behavior of AA2024 Aluminum Alloy

被引：0
|
作者：
Sun Li [1 ]
Niu Fengjiao [1 ]
Wu Cuilan [1 ]
Lai Yuxiang [1 ]
Chen Jianghua [1 ]
机构：
[1] Hunan Univ, Changsha 410082, Hunan, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2019年 / 48卷 / 09期
关键词：
2024 aluminum alloy; intergranular corrosion; grain attack; stress corrosion; artificial aging; INTERGRANULAR CORROSION; LOCALIZED CORROSION; PITTING INITIATION; S-PHASE; SUSCEPTIBILITY; MORPHOLOGY;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of precipitation microstructure change on the stress corrosion behavior of AA2024 aluminum alloy was investigated by constant load stress corrosion tests, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results show that the T3 alloy is much more sensitive to stress corrosion than the T8 alloy. The corrosion process and precipitation microstructure change of T3 and T8 alloys were investigated by in-situ corrosion observations operated by high-angle annular dark-field scanning TEM (HAADF-STEM), which intuitively demonstrate the different corrosion morphologies: T3 alloy shows intergranular corrosion and T8 alloy exhibits a combination of intergranular corrosion and grain attack. Because of the change in precipitation microstructure and corrosion mechanism, the alloys with different aging conditions possess different stress corrosion susceptibility.
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页码：2944 / 2950
页数：7
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