Abstract
In this study, we investigated the corrosion resistance and mechanical properties of a CoCrFeNiAl0.2Cu0.8 high-entropy alloy (HEA) that was subjected to high-pressure solidification at 4 and 7 GPa. In addition, the mechanism of the effect of Cu segregation regulation on the properties was described. Results indicated that the volume fraction of the Cu-enriched FCC2 phase segregated at the grain boundary decreased from 8.17 % to 5.42 % under high pressure. We also observed that high-pressure solidification can lead to the formation of nano-precipitates in the FCC2 phase with better refinement and distribution uniformity. The reduction in the Cu-enriched FCC2 phase led to a decrease in the corrosion rate by approximately 85.6 % with an increased solidification pressure of 7 GPa, thereby improving corrosion resistance. Finally, we achieved a superior hardness and yield strength combination via fine-scale nano-precipitates and solution strengthening.
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