【摘要】 高熵合金涂层能够有效提升轻质合金的耐磨损性能。CeO₂和Y₂O₃作为两种常见的稀土氧化物，常被用作掺杂颗粒，以调控高熵合金（HEA）涂层的微观结构和性能。本文通过极高速激光熔覆工艺（EHLC）分别制备了未掺杂（H₀）、掺杂CeO₂（H₁）、掺杂Y₂O₃（H₂）和掺杂CeO₂+Y₂O₃（H₃）的四种高熵合金涂层，深入探究了稀土掺杂颗粒及双相协同作用对涂层的微观组织和磨损性能的影响。分析表明：单一的CeO₂或Y₂O₃掺杂可有效提高BCC相含量，细化涂层的晶粒组织。然而，当CeO₂和Y₂O₃共同掺杂时，涂层的BCC相含量提升效果更为显著，晶粒细化现象更为明显。另外，H₃涂层在CeO₂和Y₂O₃双相协同作用下，组织中的固溶强化、晶格畸变和细晶粒强化效果得到显著增强，导致H₃涂层的显微硬度大幅增加，达到970.36HV，磨损率仅为1.87×10^-5 mm³/（N·mm）。与H₀、H₁和H₂涂层相比，其硬度分别增加了1.54倍、1.51倍和1.26倍，而磨损率分别减少了15.77%、12.83%和11.23%。涂层的主要磨损机制包括磨料磨损、粘着磨损和氧化磨损。更多还原

【Abstract】 High-entropy alloy（HEA） coatings can effectively improve the wear properties of light alloys. CeO2 and Y2O3 are two common rare-earth oxides that are often used as dopants to modify the structure and properties of the HEA coatings. In this paper, the HEA coatings of undoped（H₀）, doped with CeO₂（H₁）, Y₂O₃（H₂）, and CeO₂+Y₂O₃（H₃） were prepared by extremely high-speed laser cladding（EHLC）. The effects of rare-earth biphasic particles and their synergistic effects on the microstructure and wear properties of the coatings were investigated. The results show that single CeO₂/Y₂O₃ doping can effectively improve the body-centered cubic（BCC） phase content and refine the grain structure of the coating, but when CeO₂ and Y₂O₃ are co-doped, the BCC phase content of the coating can be improved more significantly, and the grain refinement is more obvious. Furthermore, the synergistic action of CeO₂ and Y₂O₃ in the H3 coating resulted in a significant enhancement of the effects of solid solution strengthening, lattice distortion, and finegrain strengthening within the microstructure. This resulted in a substantial increase in the microhardness of the H₃ coating, reaching 970.36 HV, with a wear rate of merely 1.87×10^-5 mm³/（N·mm）. In comparison with the H₀, H₁, and H₂ coatings, the hardness increased by 1.54 times, 1.51 times, and 1.26 times, respectively. Concurrently, the wear rates decreased by 15.77%, 12.83%, and 11.23%, respectively. The primary wear mechanisms observed in the coatings include abrasive wear, adhesive wear, and oxidative wear.更多还原