Abstract High-entropy alloy (HEA) coatings with near-equal molar ratio TiAlNiSiV were synthesized by laser cladding on a Ti-6Al-4 V alloy. The structure and composition of the HEA coating were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) on a microscope equipped with energy-dispersive spectroscopy (EDS). The results showed that the HEA coating mainly comprised (Ti,V)5Si3, NiAl and TiN. NiAl with the B2 structure was an ordered structure of BCC structure. (Ti,V)5Si3 was generated by mutual dissolution of V5Si3 and Ti5Si3. The phase composition was theoretically identified by the existing binary and ternary phase diagrams and the Gibbs energy of Ti5Si3 and V5Si3. The hardness of the TiAlNiSiV HEA coating was 1151∼1357 HV, which was 4∼6 times that of the substrate. The wear resistance of the TiAlNiSiV HEA coating was 5 and 4 times that of the substrate at room temperature and 800℃, respectively. The wear mechanism of the coating was abrasive wear, while that of the Ti-6Al-4 V substrate was abrasive wear and adhesive wear. At 800℃, oxidative wear happened on the substrate and the TiAlNiSiV HEA coating. Dispersion strengthening and solution strengthening improved the hardness and wear resistance of the TiAlNiSiV HEA coating.

中文翻译：

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Ti-6Al-4V上TiAlNiSiV高熵激光熔覆涂层的组织和耐磨性

摘要 通过激光熔覆在 Ti-6Al-4 V 合金上合成了具有近等摩尔比 TiAlNiSiV 的高熵合金 (HEA) 涂层。HEA 涂层的结构和组成在配备能量色散光谱 (EDS) 的显微镜上通过 X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 进行表征。结果表明HEA涂层主要由(Ti,V)5Si3、NiAl和TiN组成。B2结构的NiAl是BCC结构的有序结构。(Ti,V)5Si3 是由 V5Si3 和 Ti5Si3 相互溶解生成的。通过现有的二元和三元相图以及 Ti5Si3 和 V5Si3 的吉布斯能，理论上可以确定相组成。TiAlNiSiV HEA涂层的硬度为1151～1357 HV，是基体硬度的4～6倍。TiAlNiSiV HEA涂层在室温和800℃下的耐磨性分别是基体的5倍和4倍。涂层的磨损机理为磨粒磨损，而Ti-6Al-4V基体的磨损机理为磨粒磨损和粘着磨损。在800℃时，基体和TiAlNiSiV HEA涂层发生氧化磨损。弥散强化和固溶强化提高了 TiAlNiSiV HEA 涂层的硬度和耐磨性。