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    等离子熔覆FeCoCrNiAl0.5Ti0.5高熵合金涂层的组织及耐磨性能

    Microstructure and Wear Resistance of Plasma Cladding FeCoCrNiAl0.5Ti0.5 High Entropy Alloy Coating

    • 摘要: 采用机械合金化法制备FeCoCrNiAl0.5Ti0.5高熵合金粉末,再经等离子熔覆制备高熵合金涂层,研究了机械合金化后高熵合金粉末的微观结构,分析了高熵合金涂层的显微组织、硬度和耐磨性能。结果表明:机械合金化后形成了具有体心立方和面心立方结构双相固溶体的FeCoCrNiAl0.5Ti0.5高熵合金粉末,粒径在2~4 μm。熔覆制备的高熵合金涂层仍保持双相固溶体结构,无明显孔隙、裂纹等缺陷,由熔覆界面处至涂层表面依次形成了胞状晶→树枝晶→等轴晶的典型熔覆组织;高熵合金涂层的平均显微硬度达616.6 HV,为NM400钢的1.46倍,同等磨损条件下的磨损质量损失为NM400钢的48%,磨损机制以磨粒磨损为主,表现出较优的耐磨性能。

       

      Abstract: FeCoCrNiAl0.5Ti0.5 high entropy alloy powder was prepared by mechanical alloying, and then high entropy alloy coating was prepared by plasma cladding. The microstructure of the high entropy alloy powder was studied after mechanical alloying, and the microstructure, hardness and wear resistance of the high entropy alloy coating were analyzed. The results show that the FeCoCrNiAl0.5Ti0.5 high entropy alloy powder with two-phase solid solution structure of body-centered cubic and face-centered cubic structures was formed after mechanical alloying, and the particle size was 2–4 μm. The cladded entropy alloy coating still maintained the two-phase solid solution structure, and had no obvious pores, cracks and other defects. The typical cladding microstructure of cellular crystals→dendritic crystals→equiaxed crystals were formed from cladding interface to coating surface in the high entropy alloy coating in sequence. The average microhardness of the high entropy alloy coating was 616.6 HV, which was 1.46 times that of NM400 steel. Under the same wear conditions, the wear quality loss of the high entropy coating was 48% that of NM400 steel, and the wear mechanism was mainly abrasive wear; the high entropy coating had relatively excellent wear resistance.

       

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