Abstract
In this study, the high-pressure torsion (HPT) process was adopted to produce microstructure heterogeneity in a 5052 Al-Mg alloy. The influences of microstructural heterogeneity on the corrosion resistance and microhardness were characterized. The results show that, compared with the annealed samples, the microhardness is significantly increased and corrosion resistance is reduced by HPT treatment. Due to the massive formation of high-angle grain boundaries (HAGBs), which provide nucleation sites for pitting corrosion, grain refining induced by HPT will reduce the corrosion resistance of 5052 Al-Mg alloy. Meanwhile, when the fractions of HAGBs are similar, compared to heterogeneous materials, the corrosion resistance of materials with homogenous microstructures is better.
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