Microstructural characteristics and mechanical properties of bobbin-tool friction stir welded 2024–T3 aluminum alloy

被引：7
作者：
Ji-hong Dong [1 ,2 ]
Chong Gao [3 ]
Yao Lu [4 ]
Jian Han [4 ]
Xiang-dong Jiao [1 ,5 ]
Zhi-xiong Zhu [4 ]
机构：
[1] Mechanical and Electrical Engineering Institute,Beijing University of Chemical Technology
[2] China Friction Stir Welding Center,Beijing Aeronautical Manufacturing Technology Research Institute
[3] Chinalco Research Institute of Science and Technology  4. School of Mechanical,Materials and Mechatronic Engineering,University of Wollongong
[4] Research Centre of Joining Technology in Ocean Engineering,Beijing Institute of Petrochemical Technology
来源：
InternationalJournalofMineralsMetallurgyandMaterials | 2017年 / 24卷 / 02期
关键词：
aluminum alloys; friction stir welding; mechanical properties; microstructure;
D O I：
暂无
中图分类号：
TG453.9 []; TG146.21 [];
学科分类号：
080201 ; 080502 ; 080503 ;
摘要：
Cold-rolled 2024–T3 sheet alloy was subjected to bobbin-tool friction stir welding(BTFSW). The microstructural characteristics and mechanical properties of the nugget zone in the as-welded state were investigated. The results show that the equiaxed grain size of BTFSW 2024–T3 alloy decreases from 7.6 to 2.8 μm as the welding speed is increased from 80 to 120 mm/min; in addition,fine grains are generated in the nugget zone and the size distribution is non-uniform. All Al2Cu Mg(S′) precipitates dissolve into the Al matrix,whereas Mn-rich phases confirmed as T phases(Al20Cu2Mn3,Al6Mn,or Al3Mn) remain unchanged. The optimized parameters for BTFSW are verified as the rotation speed of 350 r/min and the travel speed of 100 mm/min. The variations in precipitation and dislocation play more important roles than grain size in the nugget zone with respect to influencing the mechanical properties during the BTFSW process. After the BTFSW process,the fracture mode of base material 2024–T3 alloy transforms from ductile rupture to ductile-brittle mixed fracture.
引用
收藏
页码：171 / 178
页数：8
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