Abstract The influence of laser parameters and alloying elements on the dilution rate of FeCoCrNi coating was investigated. It was found that the alloying elements have more significant effect on the dilution rate than the laser cladding parameters. Optical microscopy, scanning electron microscopy, X-ray diffraction analysis, micro-hardness test, wear test, electrochemical corrosion test, and high-temperature oxidation test were conducted to study the influence of dilution rate on the microstructure and properties of the FexCoCrNi coatings. The results have shown that the transfer of Fe element from the substrate could make the mixed entropy of the Fe0CoCrNi coating close to the theoretical mixed entropy of the FeCoCrNi high-entropy alloy. Excess Fe element in the original powder increased the dilution rate, leading to a reduction in the mixed entropy of the coating. However, it did not lead to the generation of new phases in the coating. The atomic radius differences between the elements could lead to large lattice distortion in the FCC crystal lattice. The level of lattice distortion and micro-hardness of the FexCoCrNi coatings increased with increasing Fe element content. Furthermore, the excess Fe elements weakened the self-passivation ability and deteriorated the high-temperature oxidation resistance of the coating.

中文翻译：

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稀释率对FeCrCoNi高熵合金涂层组织和性能的影响

摘要 研究了激光参数和合金元素对FeCoCrNi涂层稀释率的影响。结果表明，合金元素对稀释率的影响比激光熔覆参数更显着。通过光学显微镜、扫描电子显微镜、X射线衍射分析、显微硬度试验、磨损试验、电化学腐蚀试验和高温氧化试验研究稀释率对FexCoCrNi涂层组织和性能的影响。结果表明，Fe元素从基体的转移可使Fe0CoCrNi涂层的混合熵接近于FeCoCrNi高熵合金的理论混合熵。原粉中过量的Fe元素增加了稀释率，导致涂层的混合熵降低。然而，它并没有导致涂层中新相的产生。元素之间的原子半径差异可能导致 FCC 晶格中的大晶格畸变。FexCoCrNi 涂层的晶格畸变水平和显微硬度随着 Fe 元素含量的增加而增加。此外，过量的Fe元素削弱了涂层的自钝化能力，降低了涂层的高温抗氧化性。