Influences of Friction Stir Welding and Post-Weld Heat Treatment on Al-Cu-Li Alloy

被引：10
作者：
Lin, Yi [1 ]
Lu, Change [2 ]
Wei, Chengyang [3 ]
Zheng, Ziqiao [4 ]
机构：
[1] Sichuan Univ Sci & Engn, Analyt & Testing Ctr, Zigong 643000, Peoples R China
[2] Sichuan Univ Sci & Engn, Coll Chem & Environm Engn, Zigong 643000, Peoples R China
[3] Guangdong Zhaoqing Inst Qual Inspect & Metrol, Adv Met Mat Res Lab, Zhaoqing 526000, Peoples R China
[4] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源：
ADVANCED ENGINEERING MATERIALS | 2018年 / 20卷 / 02期
关键词：
Al-Cu-Li alloy; friction stir welding; microstructures; post-weld heat treatment; tensile properties; MINOR SOLUTE ADDITIONS; MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; MG ALLOYS; MICROSTRUCTURE; KINETICS; BEHAVIOR; ZR;
D O I：
10.1002/adem.201700652
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, the influences of friction stir welding (FSW) and post-weld heat treatment (PWHT) on the microstructures and tensile properties of Al-Cu-Li alloy are investigated. After FSW, strengthen loss occurred in the welding area. Remarkable softening occurs in the thermo-mechanically affected zone (TMAZ) resulting from dissolution of Al3Li () phases. Recrystallization and precipitation of ultra-fine phases take place in the nugget zone (NZ) that lightens the softening degree of this zone. A noteworthy enhancement in the hardness and tensile strength of the joint is achieved after T8 reaging treatment (3% - pre-deformation, 30h at 152 degrees C). However, re-solution treatment coupled with re-aging treatment leads to ductility deterioration in the joint because coplanar slip of coarse Al3Li phases induces severe stress concentration during plastic deformation.
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页数：8
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