Microstructure evolution and its effect on the corrosion of dissimilar aluminum alloys friction stir welding joint

被引：31
作者：
Lu, Hongjian [1 ]
Xu, Weifeng [1 ]
Wang, Huan [1 ]
Wang, Xian-Zong [2 ]
机构：
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, Shaanxi Key Lab Frict Welding Technol, Xian 710072, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Sch Mat Sci & Engn, Xian 710072, Shaanxi, Peoples R China
来源：
CORROSION SCIENCE | 2023年 / 220卷
基金：
中国国家自然科学基金;
关键词：
Friction stir welding; Dissimilar aluminum alloys joint; Microstructure evolution; Corrosion; Galvanic corrosion; MECHANICAL-PROPERTIES; BEHAVIOR; RESISTANCE; TEMPERATURE; AA5083;
D O I：
10.1016/j.corsci.2023.111249
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructural heterogeneity in weld nugget zone (WNZ) of dissimilar AA7050-AA2024 friction stir welding joint and its effect on galvanic corrosion (GC) were explored. The increase in solid-solutioned Zn content and the number of intergranular MgZn2 greatly worsens the corrosion resistance of local AA7050-WNZ, while the grain refinement and fragmented Al2Cu slightly improves that of local AA2024-WNZ. The heterogeneous micro-structure evolution lowers the GC resistance of global WNZ, causing the severest GC at WNZ-bottom with lowest resistance. The GC and intergranular corrosion synergistically promote the dissolution process. This work pro-vides an insight on GC of dissimilar joint from microstructural heterogeneity.
引用
收藏
页数：17
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