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.

中文翻译：

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显微组织不均匀性对5052铝镁合金耐蚀性和显微硬度的影响

在这项研究中，采用高压扭转 (HPT) 工艺在 5052 铝镁合金中产生显微组织不均匀性。表征了显微组织不均匀性对耐腐蚀性和显微硬度的影响。结果表明，与退火试样相比，HPT处理显微硬度显着提高，耐腐蚀性能降低。由于大角度晶界（HAGBs）的大量形成，为点蚀提供了形核位点，HPT引起的晶粒细化会降低5052铝镁合金的耐腐蚀性能。同时，当HAGBs的分数相似时，与异质材料相比，具有均质微观结构的材料的耐腐蚀性能更好。