Microstructure and mechanical properties of the welding joint filled with microalloying 5183 aluminum welding wires |
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Authors: | Zhen Xu Zhi-hao Zhao Gao-song Wang Chao Zhang Jian-zhong Cui |
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Institution: | 1. The Key Laboratory of the Ministry of Education of China for Electromagnetic Processing of Materials, Northeastern University, Shenyang, 110819, China
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Abstract: | In this study, 7A52 aluminum alloy sheets of 4 mm in thickness were welded by tungsten inert gas welding using microalloying welding wires containing traces of Zr and Er. The influence of rare earth elements Zr and Er on the microstructure and mechanical properties of the welded joints was analyzed by optical microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, hardness testing, and tensile mechanical properties testing. Systematic analyses indicate that the addition of trace amounts of Er and Zr leads to the formation of fine Al3Er, Al3Zr, and Al3(Zr,Er) phases that favor significant grain refinement in the weld zone. Besides, the tensile strength and hardness of the welded joints were obviously improved with the addition of Er and Zr, as evidenced by the increase in tensile strength and elongation by 40 MPa and 1.4%, respectively, and by the welding coefficient of 73%. |
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Keywords: | aluminum alloys inert gas welding rare earth elements microalloying joints microstructure mechanical properties |
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