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采用激光熔覆技术制备FeCrNiCoMnB_x高熵合金涂层,研究了硼含量对激光熔覆FeCrNiCoMnB_x高熵合金涂层的组织结构、硬度和摩擦磨损性能的影响,以及硼化物中层错形成机制。结果表明:涂层均由简单fcc结构固溶体和硼化物两相组成。当硼含量x≤0.75时,生成的硼化物以(Cr,Fe)_2B相为主;而当硼含量x=1时,生成大量的(Fe,Cr)_2B相。随着硼含量的增加,涂层中的硼化物含量增加,硬度增大,耐磨性能增强。硼化物(Fe,Cr)_2B相在(110)面存在大量堆垛层错。硼化物中的层错是(Fe,Cr)_2B相通过(110)面的层错(滑移距离为1/4[111])方式而向(Cr,Fe)_2B相转变而产生。
The laser cladding technology was used to prepare FeCrNiCoMnB_x high entropy alloy coating. The effect of boron content on the microstructure, hardness and friction and wear properties of laser cladding FeCrNiCoMnB_x high entropy alloy coating was studied. The results show that the coating consists of two phases of simple fcc structure solid solution and boride. When the boron content is less than or equal to 0.75, the formation of borides is dominated by (Cr, Fe) _2B phase. When the boron content is x = 1, a large amount of (Fe, Cr) _2B phase is formed. With the increase of boron content, the content of boride in the coating increases, the hardness increases, and the wear resistance increases. Boron (Fe, Cr) _2B phase in the (110) surface there is a large number of stacking faults. The layering in the boride is caused by the transformation of the (Fe, Cr) _2B phase into the (Cr, Fe) _2B phase by the layer fault of the (110) plane with the slip distance of 1/4 [111].