Effect of heat treatment on microstructure, mechanical properties and corrosion resistance of 7075 aluminum alloys fabricated by improved friction stir additive manufacturing

被引：0
|
作者：
Liu, Ji [1 ,2 ]
Miao, Yugang [1 ]
Wu, Ruizhi [2 ]
Wei, Chao [3 ]
Zhao, Yuyang [1 ]
Wu, Yifan [1 ]
Deng, Qingwen [1 ]
机构：
[1] National Key Laboratory of Science and Technology on Underwater Vehicle, Harbin Engineering University, Harbin,150001, China
[2] Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin,150001, China
[3] Harbin Welding Institute Ltd Co, Harbin,150028, China
来源：
Journal of Alloys and Compounds | 2024年 / 1007卷
关键词：
The use of an improved stirrng pin broadened the effective bonding area in the friction stir additive manufacturing (FSAM) of 7075 aluminum alloy. A systematic investigation was conducted to examine the effects of different heat treatment (T6; T73; and RRA) processes on the microstructure; tensile strength and corrosion resistance of as-fabricated (AS) specimen. The findings revealed that different heat treatments had minimal impact on the grain size; texture strength; and dislocation density. Variations in strength and corrosion resistance were primarily attributed to the size and distribution of precipitates. Following T6 heat treatment; the intragranular precipitates (IGPs) were smaller; with a higher proportion of η'; while the grain boundary precipitates (GBPs) were coarser η; continuously distributed along grain boundaries. Consequently; T6 specimen showed the highest tensile strength; reaching; 568; MPa; but had lower corrosion resistance than AS specimen due to precipitate-induced disruption of the passive film. The T73 heat treatment resulted in significant coarsening of IGPs; with a substantial transformation of η' to η; thereby reducing the precipitation strengthening effect. The coarsening of GBPs led to their discontinuous distribution along grain boundaries; which significantly increased the corrosion resistance. After RRA heat treatment; IGPs consisted of numerous fine η'; while the coarser GBPs sporadically dispersed along grain boundaries. The strength of RRA specimen was only about 6 % lower than that of T6 specimen; but its corrosion resistance was significantly improved. © 2024 Elsevier B.V;
D O I：
10.1016/j.jallcom.2024.176512
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