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Investigation into the Dissimilar Friction Stir Welding of AA5052 and AA6061 Aluminum Alloys Using Pin-Eccentric Stir Tool

1
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
2
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
4
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong NSW 2522, Australia
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(7), 718; https://doi.org/10.3390/met9070718
Received: 4 June 2019 / Revised: 18 June 2019 / Accepted: 24 June 2019 / Published: 26 June 2019
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Abstract

Friction stir welding with different pin-eccentric stir tools (the pin eccentricities were 0, 0.4, and 0.8 mm, respectively) was successfully utilized for joining dissimilar aluminum alloys AA5052 and AA6061, and the influences of pin eccentricity on the microstructural evolution and mechanical properties of joints were investigated. The results showed that sound joints could be obtained by placing the hard AA6061 in the advancing side, while the welding heat input led to both the coarsening of strengthening precipitates and dynamic recrystallization and softening of the nugget zone (NZ). The application of pin eccentricity promoted the material flow in the NZ and enlarged the area of the “onion ring”. Furthermore, the average grain size and fraction of recrystallized grain in the NZ decreased as the pin eccentricity increased. All joints failed in the NZ during tensile tests, and the joint produced by the 0.8 mm-pin-eccentric stir tool performed the highest tensile strength due to the enhanced grain-boundary and dislocation strengthening. View Full-Text
Keywords: dissimilar aluminum alloys; friction stir welding; pin eccentricity; microstructure; mechanical properties dissimilar aluminum alloys; friction stir welding; pin eccentricity; microstructure; mechanical properties
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Chen, Y.; Wang, H.; Li, H.; Wang, X.; Ding, H.; Zhao, J.; Zhang, F. Investigation into the Dissimilar Friction Stir Welding of AA5052 and AA6061 Aluminum Alloys Using Pin-Eccentric Stir Tool. Metals 2019, 9, 718.

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