Abstract
A strategy was designed to synergistically enhance the AlCoCrFeNi high-entropy alloy with Laves and ceramic phases to meet the demanding requirements of HEA coatings in extreme environments. The results reveal that all coatings exhibit a BCC phase, with the doping of Nb and TiC introducing Laves and MC phases into the coatings, respectively. The co-doping of Laves phase and ceramic phase introduces multiple strengthening mechanisms, including precipitation strengthening, second phase strengthening, solid solution strengthening, and grain refinement. Additionally, it facilitates the formation of a stable passive film and mitigates galvanic corrosion effects. As a result, this synergistically enhances the coating's microhardness, wear resistance, and corrosion resistance. In comparison to the individual addition of Nb and TiC, the co-doping results in a reduction of wear rates by 89.2 % and 82.8 %, respectively, and similarly, corrosion current densities decrease by 56.6 % and 79.6 %, respectively.
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