Abstract
Friction stir welding (FSW) induces significant microstructural modifications in AA7050, involving the dynamic recrystallization in the weld nugget zone (WNZ) and coarsening of intermetallic particles (IMPs) in the heat-affected zone (HAZ). Accounting for the enhanced Volta potential and nano-hardness, the coarse IMPs in HAZ contribute to anodic attack and initiation of wear cracks, thereby facilitating tribocorrosion damage. The multiple galvanic corrosion represented by nano-precipitate MgZn2 vs. Al-matrix, coupled with the absence of the ball-bearing effect originated from IMPs, contribute to the inferior tribocorrosion performance of WNZ. This research offers valuable references into the tribocorrosion mechanism of FSW aluminium alloy joints.
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