Liang Jiazhu, Liu Hongxi, Zhang Qinghua, Zhou Ling, Peng Yuanrun
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Materials (Basel). 2025 Apr 12;18(8):1770. doi: 10.3390/ma18081770.
WMoTaNbV refractory high-entropy alloys (RHEAs) have received widespread attention due to their excellent low-temperature toughness, hardness, and wear resistance. In recent years, the rapid development of surface modification technology represented by laser cladding has provided a new technological path for RHEA surface forming, and at the same time put forward higher requirements for raw material powder. In this study, WMoTaNbV RHEA spherical powder was prepared by radiofrequency plasma spheronization, and then WMoTaNbV RHEA coating was prepared on the surface of Ti6Al4V (TC4) alloy by laser cladding technique. The experimental results show that the prepared alloy powders have very high sphericity and are almost free of agglomeration and oxidation. Coatings with laser powers of 3.1-3.9 kW (gradient setting of 2 kW) were tested, with the 3.3, 3.5, and 3.7 kW coatings showing the best of the abrasion resistance. The microhardness of the 3.3 kW, 3.5 kW, and 3.7 kW coatings was 1.72, 1.97, and 1.76 times higher than that of the substrate, and the wear resistance was 1.83, 3.42, and 2.13 times higher than that of the TC4 substrate, respectively. This experimental result shows that the surface hardness and wear resistance of WNbMoTaV RHEA coating can be effectively improved by precisely regulating the laser power, thus improving the surface hardness and friction and wear properties of TC4 titanium alloy.
WMoTaNbV难熔高熵合金（RHEAs）因其优异的低温韧性、硬度和耐磨性而受到广泛关注。近年来，以激光熔覆为代表的表面改性技术的快速发展为RHEA表面成型提供了一条新的技术途径，同时也对原料粉末提出了更高的要求。本研究采用射频等离子体球化法制备了WMoTaNbV RHEA球形粉末，然后通过激光熔覆技术在Ti6Al4V（TC4）合金表面制备了WMoTaNbV RHEA涂层。实验结果表明，制备的合金粉末具有很高的球形度，几乎没有团聚和氧化现象。测试了激光功率为3.1-3.9kW（梯度设置为2kW）的涂层，其中3.3、3.5和3.7kW的涂层耐磨性最佳。3.3kW、3.5kW和3.7kW涂层的显微硬度分别比基体高1.72、1.97和1.76倍，耐磨性分别比TC4基体高1.83、3.42和2.13倍。该实验结果表明，通过精确调节激光功率可以有效提高WNbMoTaV RHEA涂层的表面硬度和耐磨性，从而改善TC4钛合金的表面硬度和摩擦磨损性能。
