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JMEPEG https://doi.org/10.1007/s11665-018-3253-6

Effect of Exchanging Advancing and Retreating Side Materials on Mechanical Properties and Electrochemical Corrosion Resistance of Dissimilar 6013-T4 and 7003 Aluminum Alloys FSW Joints Zhixia Zhao, Haimei Liang, Yong Zhao, and Keng Yan (Submitted August 20, 2017; in revised form January 7, 2018) Friction stir welding (FSW) was used to weld dissimilar joints between Al 6013-T4 and Al7003 alloys in this work. The effect of exchanging advancing (AS) and retreating (RS) side material on microstructure, mechanical behaviors and electrochemical corrosion resistance was discussed. Results showed that different joint cross sections were obtained when exchanging AS and RS materials. The material on the AS would be more deformed during the welding process. When the Al6013 placed on the AS, the plastic flow of weld is more sufficient. Whether on the AS or RS, the Al6013-T4 side is the weak region for both tensile specimens and hardness samples. The fracture position corresponds to the minimum hardness position. Also, more strengthening phase can be retained in the joint, and the joint of A6R7 has better corrosion resistance. Keywords

dissimilar aluminum alloy joints, electrochemical corrosion, friction stir welding, mechanical behavior, microstructure

1. Introduction Because of its advantages of low density, high strength and good corrosion resistance, aluminum alloy has been widely used in modern industry (Ref 1, 2). However, there are many problems in the use of traditional fusion welding of aluminum alloys, such as the formation of the two brittle phase, the solidification cracking, high deformation, and residual stress (Ref 3). Friction stir welding (FSW) is a kind of solid state-welding technology, which was invented by the British Welding Research Institute (TWI). In the process of FSW aluminum alloy, the joint does not produce hot cracks, porosity and other fusion welding defects. Therefore, FSW is widely used in aluminum alloy welding (Ref 4-6). Among aluminum alloys, 6xxx and 7xxx aluminum alloys are two of the most widely used aluminum alloys (Ref 7-9). In recent years, friction stir welding of dissimilar aluminum alloy has been widely studied. Guo et al. (Ref 10) studied the influence of parameters on material flow, microstructure, distribution of micro-hardness and tensile properties of dissimilar aluminum alloy friction stir welding by exchanging materialsÕ location. The researchers studied the distribution of the temperature field, and the effect of the position of the material on the properties had been studied from the macroscopic point of view, but they did not study the mechanism. Zhixia Zhao, Haimei Liang, Yong Zhao, and Keng Yan, Provincial Key Lab of Advanced Welding Technology, Jiangsu University of Science and Technology, No. 2 Mengxi Road, Zhenjiang 212003 Jiangsu, China. Contact e-mail: [email protected].

Journal of Materials Engineering and Performance

Ravikumar et al. (Ref 11) put 6xxx aluminum alloy on the advancing side, and FSW of dissimilar al