Effect of microstructure inhomogeneity on creep behavior of friction stir welding 7B50-T7451 aluminum alloy thick plate joint

被引：24
作者：
Wang, Huan [1 ]
Xu, Weifeng [1 ]
Lu, Hongjian [1 ]
Liu, Yuli [1 ]
机构：
[1] Northwestern Polytech Univ, Shaanxi Key Lab Frict Welding Technol, Xian 710072, Shaanxi, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2022年 / 193卷
基金：
中国国家自然科学基金;
关键词：
Friction stir welding; Microstructure inhomogeneity; Creep properties; Creep mechanism; MECHANICAL-PROPERTIES; PRECIPITATE EVOLUTION; TEMPERATURE;
D O I：
10.1016/j.matchar.2022.112292
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microstructure inhomogeneity and through-thickness creep properties of friction stir welding (FSW) 7B50-T7451 aluminum alloy thick plate joint were investigated. The results show that creep properties of the FSW joint deteriorate along the thickness direction from the top to the bottom. Both the grain size and fraction of the low -angle grain boundaries (LAGBs) in the weld nugget zone (WNZ) decrease from the top to bottom. A larger volume of precipitate free zone (PFZ) and coarser precipitates in the bottom slice reduce creep resistance compared with the top. The precipitates in the heat-affected zone (HAZ) exhibit continuous coarsening with the increase of creep temperature, inducing the decrease of threshold stress. The dominant creep mechanism transforms from dislo-cation creep in the HAZ to grain boundary sliding (GBS) in the WNZ when creep temperature increases. The fracture mode also changes from transgranular to intergranular fracture.
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页数：17
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