ABSTRACT The combined effects of solidification microstructure refining scale and T6 heat treatment conditions on corrosion behaviour and Vickers microhardness of an Al–3 wt-% Cu–0.5 wt-% Mg alloy were studied. Then, representative samples having quite distinct primary dendritic spacings were solution treated at 495°C for 3 h and artificially aged at 200°C during different times. It was found that the feature of finer solidification microstructure having higher corrosion current density and higher microhardness can be inherited to subsequent T6 heat treatments. In contrast to the as-cast condition, the aging times of 0.5 and 1 h were shown to promote lower corrosion rates without corrosion occurring at the central region of Al-rich matrix. On the other hand, the aging time of 3 h led to a significant decrease in both the corrosion resistance and the microhardness. Finally, a comparative analysis with other works from the literature was also conducted.

中文翻译：

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Al-Cu-Mg合金T6热处理中凝固组织的长度尺度调整耐蚀性和显微硬度

摘要 研究了凝固组织细化氧化皮和 T6 热处理条件对 Al-3 wt-% Cu-0.5 wt-% Mg 合金腐蚀行为和维氏显微硬度的综合影响。然后，具有非常明显的初级枝晶间距的代表性样品在 495°C 下固溶处理 3 小时，并在不同时间在 200°C 下人工时效。结果表明，具有更高腐蚀电流密度和更高显微硬度的更细的凝固组织特征可以继承到随后的T6热处理中。与铸态条件相比，0.5 和 1 小时的时效时间表明可以促进较低的腐蚀速率，而不会在富铝基体的中心区域发生腐蚀。另一方面，3 h 的时效时间导致耐腐蚀性和显微硬度显着下降。最后，还与文献中的其他作品进行了比较分析。