Influence of Zn coating on friction stir spot welded magnesium-aluminium joint |
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| Authors: | R. Z. Xu D. R. Ni Q. Yang C. Z. Liu |
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| Affiliation: | 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China;2. College of Material Science and Engineering, Shenyang Aerospace University, Shenyang, China;3. College of Material Science and Engineering, Shenyang Aerospace University, Shenyang, China |
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| Abstract: | For friction stir spot welded (FSSW) magnesium–aluminium joints, the formation of Mg–Al intermetallics in the hook region and cracking at the interface damaged seriously the strength of Mg–Al joints, resulting in lower joint load of only 0.8?±?0.2?kN. When adding the hot-dipped Zn coating on the Al substrate surface prior to FSSW, a brazed layer, composed of Mg–Zn and Al–Zn diffusion zones at the edge of the shoulder, and a transition layer, composed of MgZn2, Zn-rich zone and residual Zn in the hook region, were formed in the FSSW Mg–Al joint, eliminating the cracking and Mg–Al intermetallics in the FSSW joint without the Zn coating. The load of the joint with the Zn coating increased to 3.7?±?0.3?kN. |
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| Keywords: | Friction stir spot welding dissimilar metals hot-dipped Zn coating intermetallic compound |
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