Q235钢等离子熔覆AlCoCrCuFe<sub>x</sub>Ni高熵合金涂层的组织和性能

Q235钢等离子熔覆AlCoCrCuFe_xNi高熵合金涂层的组织和性能

摘要: 采用等离子熔覆在Q235钢基体上制备了AlCoCrCuFe_xNi高熵合金涂层，利用SEM、EDS和XRD分析涂层的微观组织，并测试了涂层的显微硬度和耐磨性。结果表明，采用Al、Co、Cr、Cu、Fe、Ni混合粉末在Q235钢基体上可制备出与基体冶金结合的高熵合金涂层，涂层厚度约为0.5 mm，且无裂纹和气孔。涂层的微观组织主要由FCC树枝晶和BCC枝晶间结构组成，并形成大量的纳米相和有序BCC相。涂层的显微硬度达到350～680 HV0.2，基体的磨损量约为涂层的3.4倍。

Abstract: AlCoCrCuFe_xNi high-entropy alloy(HEA) coating was prepared on Q235 steel substrate by plasma cladding. The microstructure of the HEA coating were investigated by SEM, EDS and XRD. The microhardness distribution and wear resistance of the coating were tested. The results show that the HEA coating with metallurgically bonded to the substrate can be prepared on substrate of Q235 steel using Al, Co, Cr, Cu, Fe and Ni, and whose thickness is about 0.5 mm and without crack and gas pore. The microstructure of the AlCoCrCuFe_xNi HEA coating is mainly composed of FCC dendritic and BCC interdendritic structure, forming a great deal of nano-precipitate and ordered BCC. The microhardness of the coating reaches 350-680 HV0.2, and the wear loss of the substrate is about 3.4 times than that of the coating.