| Microstructural characteristics and mechanical properties of bobbin-tool friction stir welded 2024-T3 aluminum alloy |
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| 作者姓名： | Ji-hong Dong Chong Gao Yao Lu Jian Han Xiang-dong Jiao Zhi-xiong Zhu |
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| 作者单位： | Mechanical and Electrical Engineering Institute, Beijing University of Chemical Technology, Beijing 100089, China |
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| 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 Al2CuMg (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.
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| 关 键 词： | aluminum alloys friction stir welding mechanical properties microstructure |
Microstructural characteristics and mechanical properties of bobbin-tool friction stir welded 2024–T3 aluminum alloy |
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| Ji-hong Dong,Chong Gao,Yao Lu,Jian Han,Xiang-dong Jiao,Zhi-xiong Zhu.Microstructural characteristics and mechanical properties of bobbin-tool friction stir welded 2024-T3 aluminum alloy[J].International Journal of Minerals,Metallurgy and Materials,2017,24(2):171-178. |
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| Authors: | Ji-hong Dong Chong Gao Yao Lu Jian Han Xiang-dong Jiao Zhi-xiong Zhu |
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| Affiliation: | 1.Mechanical and Electrical Engineering Institute,Beijing University of Chemical Technology,Beijing,China;2.China Friction Stir Welding Center,Beijing Aeronautical Manufacturing Technology Research Institute,Beijing,China;3.Chinalco Research Institute of Science and Technology,Beijing,China;4.School of Mechanical, Materials and Mechatronic Engineering,University of Wollongong,Wollongong,Australia;5.Research Centre of Joining Technology in Ocean Engineering,Beijing Institute of Petrochemical Technology,Beijing,China |
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| Abstract: | 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 Al2CuMg (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. |
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