Abstract: High-entropy alloys (HEAs), also known as multi-principal component solid solution alloys, have attracted widely attention of scholars at home and abroad due to its unique alloy design concepts and excellent comprehensive properties, which have gradually become a research hot spot in the field of metal materials. Refractory high-entropy alloys (RHEAs) are thought to be a new type of superalloys designed and deve-loped based on HEAs of refractory elements. Compared with traditional high-temperature alloys, RHEAs have higher high-temperature strength, high-temperature oxidation resistance and high-temperature phase stability, implicating broad application prospects in the field of aerospace and petrochemical. Since it was proposed in 2010, RHEAs have become an important branch in the research field of HEAs. So far, 4th, 5th, 6th periods and Ⅳ, Ⅴ, Ⅵ subgroup of 9 elements (Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W) and additional elements, such as Al, C, Co, Ni, were used as principal component of RHEAs by scholars, and formed a complex alloy system. There are more than 100 alloy systems reported, the phase structure of these alloys ranges from single-phase BCC structure to double-phase, such as BCC1+BCC2, BCC+Laves, etc., and to multi-phase structure, showing structural diversity. The microstructure of RHEAs includes dendrite, equiaxed crystal, eutectic structure or deformation twin structure, etc., and the properties determined by microstructure have its own strong points. The preparation of RHEAs first adopted melting methods, including arc melting and induction melting, which required repeated remelting under high-purity protective gas. In recent years, research has also been conducted on the preparation of RHEAs by powder metallurgy, which has obtained fine particle size and relatively uniform composition. In addition, laser cladding, magnetron sputtering, etc. are also used to prepare materials or coatings for RHEAs. It can be seen that with the deepening of research, RHEAs are constantly making new progress in the research of composition design, preparation process, phase structure and microstructure, room temperature and high temperature performance. In this review, according to the research status in RHEAs at home and abroad in the past few years, its principal composition, phase structure and preparation method were systematically introduced, and the evolution of RHEAs properties, including density, strength and plasticity, high-temperature oxidation resistance, wear resistance and corrosion resistance, were summarized. Finally, it points out the challenges faced by RHEAs and puts forward suggestions on future research priorities.
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