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采用激光熔覆技术在45#钢基底上制备了Al_xCrFeCoCuNi(x=0.5、2.0、4.0)高熵合金涂层,研究了Al含量x对涂层的抗氧化性能的影响规律。利用扫描电镜、能谱仪和X射线衍射仪对涂层结构进了测定,进而揭示铝含量的影响。结果表明,高熵合金涂层主要由简单面心和体心立方结构的固溶体组成,并且随着铝含量增加到x=4时完全转变为单一的体心立方结构。在900℃大气气氛中氧化动力学曲线表明Al_xCrFeCoCuNi高熵合金涂层具有较好的抗氧化性能,并且随着Al含量的增加而提高。这是因为高温氧化后其表面主要生成了Al_2O_3和Cr_2O_3保护膜,从而提高了Al_xCrFeCoCuNi高熵合金涂层的抗氧化性能。
Al_xCrFeCoCuNi (x = 0.5, 2.0, 4.0) high-entropy alloy coating was prepared on 45 # steel substrate by laser cladding. The influence of Al content x on the oxidation resistance of the coating was studied. The structure of coating was measured by SEM, EDS and XRD, which revealed the influence of aluminum content. The results show that the high-entropy alloy coating mainly consists of solid solution with simple face-centered and body-centered cubic structure and completely transformed into a single body-centered cubic structure with the aluminum content increasing to x = 4. The oxidation kinetics curves at 900 ℃ in the atmosphere show that the Al_xCrFeCoCuNi high-entropy alloy coating has good oxidation resistance and increases with the increase of Al content. The reason is that Al 2 O 3 and Cr 2 O 3 protective films are mainly formed on the surface after high temperature oxidation, which improves the oxidation resistance of Al_xCrFeCoCuNi high-entropy alloy coating.