目的 研究等离子熔覆电流对FeCoCrNiMn高熵合金涂层组织与性能的影响。方法 采用等离子堆焊工艺在65Mn钢基体上制备等摩尔比的FeCoCrNiMn高熵合金涂层。通过观察涂层的宏观表面特征来判断等离子熔覆技术制作高熵合金涂层的宏观效果。利用金相显微镜（OM）、扫描电镜（SEM）以及X射线衍射技术（XRD）观察涂层显微组织，并分析涂层的成分和相组成。采用维氏硬度显微测试计测量合金涂层的表面硬度和基体至涂层的层深硬度。结果 等离子熔覆技术制备的合金涂层无裂纹，涂层平均厚度达到2 mm。涂层元素与熔覆粉末元素比例一致，除去部分Fe元素由基体进入涂层之外，涂层依旧为单相FCC固溶体结构，组织形态为枝晶。涂层与基体结合处可以观察到明显的柱状晶区和热影响区（HAZ）。随着电流的增大，枝晶组织逐渐变粗，而FeCoCrNiMn高熵合金涂层的表面硬度逐渐减小，在190 A处，硬度发生突变达到最大值366.3HV，170 A处为最小值258.78HV。沿层深方向，涂层硬度变化不大，热影响区内由上到下，硬度先增大后减小。结论 等离子熔覆技术制备高熵合金涂层有明显的优势，且具有制作大面积表面涂层的潜力，涂层厚度可以达到毫米级。电流大小改变，FCC相组成没有发生改变，而组织结构发生改变，随着电流变大，枝晶组织变粗，涂层硬度逐渐下降。

The work aims to study the effect of plasma cladding current on the structure and properties of FeCoCrNiMn high-entropy alloy coatings. The FeCoCrNiMn high-entropy alloy coating with equimolar ratio was prepared on 65Mn steel substrate by plasma surfacing process. Firstly, the macroscopic effect of plasma cladding technology to prepare high-entropy alloy coating was determined by observing the macroscopic surface characteristics of the coating. Metallographic microscope (OM), electron microscopy (SEM) and X-ray diffraction (XRD) were used to observe the microstructure and analyze the composition and phase composition of the coating. Meanwhile the surface hardness of the alloy coating and the deep hardness of the layer from the substrate to the coating were measured by a Vickers hardness micrometer. The alloy coatings prepared were crack-free and had an average coating thickness of 2 mm. The ratio of coating elements was consistent with that of cladding power element. Except that some Fe element entered the coating from the substrate, the structure was still FCC solid solution phase and the morphology was dendritic crystal. Distinct columnar crystal zone and heat affected zone (HAZ) could be observed at the junction of the coating and the substrate. As the current increased, the dendrite structure became thicker. With the increase of current, the surface hardness of FeCoCrNiMn high-entropy alloy coating gradually decreased. The hardness was abrupt to reach the maximum value of 366.3HV at 190 A, and the minimum was 258.78HV at 170 A. The change of hardness along the depth of the layer was not obvious. With the heat affected zone from top to bottom, the hardness first increased and then decreased. Plasma cladding technology has obvious advantages in the preparation of high-entropy alloy coatings and has the potential to produce large-area surface coatings with thicknesses up to the millimeter. The change in current magnitude causes the FCC phase composition to change without changing the organization structure. As the current increases, the dendrite structure becomes thicker and the coating hardness decreases.