Effect of Y2O3 on the microstructure and tribology property of WMoTaNb refractory high entropy alloy coating prepared by laser cladding

作者：Yan Wang, Pengjiang Li, Ning Ma, Bangyan Zhang, Yingkang Wei, Liangliang Zhang, Jianyong Wang, Shifeng Liu · 发表于：International Journal of Refractory Metals and Hard Materials · 年份：2023 · DOI：10.1016/j.ijrmhm.2023.106273 · 被引用次数：104 · 研究领域：High Entropy Alloys Studies、High-Temperature Coating Behaviors、Additive Manufacturing Materials and Processes

Recently, high-entropy alloys (HEAs) reinforced with ceramic particles have attracted increasing attention due to their excellent hardness and wear resistance. In this study, the WMoTaNb-Y 2 O 3 refractory high-entropy alloy coatings were produced on Inconel 718 by laser cladding to improve the microhardness and high-temperature wear resistance of the substrate. The phase composition, microstructure, and mechanical properties of the HEAs were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness, and wear resistance tests. The results show that due to the high entropy effect and elemental diffusion, the WMoTaNb-Y 2 O 3 refractory high-entropy alloy coatings comprise simple BCC and Fe-containing phases. Y 2 O 3 particles are mainly distributed at the surface of the high-entropy alloys coatings. Y 2 O 3 particles have an advantage in the inhibition of HEAs grain growth attributed to a strong pinning effect. The microhardness and the wear resistance of the HEA composite improved significantly with the addition of Y 2 O 3 particles. A good comprehensive mechanical properties was obtained at the HEA with the addition of 3 wt% Y 2 O 3 particles, which microhardness can reach to 1274.6 HV 0.2 . The laser-cladded WMoTaNb-Y 2 O 3 high-entropy alloy coatings show a good wear performance at high temperature, which is mainly attributed to the formation of oxide films on the surface of the coating. The wear mech...