To develop inexpensive high-strength high entropy alloy (HEA) coatings, microstructure, hardness and wear behavior of Al_xCoCrFe₂Ni (with x = 0.3, 0.7, 1.0) high-entropy alloy coatings prepared by laser cladding were investigated in this work. It was found that the phase composition and microstructure of coatings with high Fe content could be tailored by adjusting Al content. Addition of Al could cause the phase to evolve from FCC to a mixture of FCC, ordered BCC (B2) and disordered BCC (A2) and finally to a mixture of A2 and B2. The hardness increased with the change of phase composition, resulting in a higher hardness (621HV) and better wear resistance at x = 1.0. The microstructure of AlCoCrFe₂Ni coating consisted of spherical nano-scale B2 particles and A2 matrix. The strengthening effects of A2/B2 morphology were estimated and strengthening of order was the most important strengthening factor. In addition, the main wear mechanism was abrasive wear with decreasing fraction of oxidation wear as Al content increased.

为了开发廉价的高强度高熵合金 (HEA) 涂层，本工作研究了通过激光熔覆制备的 Al _x CoCrFe ₂ Ni（x = 0.3、0.7、1.0 ）高熵合金涂层的微观结构、硬度和磨损行为. 结果表明，高铁含量涂层的相组成和微观结构可以通过调整铝含量来调整。添加 Al 会导致相从 FCC 演变为 FCC、有序 BCC (B2) 和无序 BCC (A2) 的混合物，最后演变为 A2 和 B2 的混合物。硬度随着相组成的变化而增加，导致在x = 1.0 时具有更高的硬度（621HV）和更好的耐磨性。AlCoCrFe ₂的微观结构Ni涂层由球形纳米级B2颗粒和A2基体组成。对A2/B2形貌的强化效果进行了评估，有序强化是最重要的强化因素。此外，主要磨损机制是磨粒磨损，随着铝含量的增加，氧化磨损的比例降低。