Investigation into Microstructure, Wear Resistance in Air and NaCl Solution of AlCrCoNiFeCTax High-Entropy Alloy Coatings Fabricated by Laser Cladding

Peng Zhao, Jun Li, R. Lei, B. Yuan, M. Xia, X. Li, Ying Zhang
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引用次数: 5

Abstract

AlCrCoNiFeCTax (x = 0, 0.5 and 1.0) high-entropy alloys coatings were synthesized on 45# steel by laser cladding. The microstructural evolution of the coatings with the change in x was analyzed in detail. The effect of Ta content on the wear behaviors of the coatings at different circumstances (in air and 3.5 wt.% NaCl solution) was especially highlighted. The microstructure presented the following change: equiaxed BCC (Body Centered Cubic) grains + fine MC (carbide, M = Al, Cr, Co and Ni) particles (x = 0) → equiaxed BCC grains + coarse TaC blocks + fine TaC particles (x = 0.5) → flower-like BCC grains + coarse TaC blocks + eutecticum (BCC + TaC) (x = 1.0). The average microhardness of the coatings demonstrated an upward tendency with increasing x due to the combination of the stronger solid solution and dispersion strengthening from the significant difference in atomic radius between Ta and Fe and the formation of TaC with an extremely high hardness. The wear rates of the coatings were gradually reduced both in air and in NaCl solution along with the increase in Ta content, which were lower than those of the substrate. The wear rates of the coatings with x = 0.5 and 1.0 in NaCl solution were slightly reduced by about 17% and 12% when compared with those in air. However, the values of the substrate and the coating without Ta in NaCl solution were sharply enhanced by 191% and 123% when compared with those in air. This indicated that the introduction of Ta contributed to the improvement in wear resistance both in air and in NaCl solution.
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激光熔覆AlCrCoNiFeCTax高熵合金涂层的组织及在空气和NaCl溶液中的耐磨性研究
采用激光熔覆法在45#钢表面合成了AlCrCoNiFeCTax (x = 0、0.5和1.0)高熵合金涂层。详细分析了涂层的微观组织随x的变化而演变。研究了不同环境(空气和3.5 wt.% NaCl溶液)下Ta含量对涂层磨损性能的影响。微观结构呈现如下变化:等轴BCC (Body Centered Cubic)晶粒+细MC(碳化物,M = Al, Cr, Co和Ni)颗粒(x = 0)→等轴BCC晶粒+粗TaC块+细TaC颗粒(x = 0.5)→花状BCC晶粒+粗TaC块+共晶(BCC + TaC) (x = 1.0)。随着x的增加,涂层的平均显微硬度呈上升趋势,这是由于Ta和Fe原子半径的显著差异所产生的更强的固溶体和弥散强化的结合以及具有极高硬度的TaC的形成。随着Ta含量的增加,涂层在空气和NaCl溶液中的磨损率逐渐降低,且低于基体。x = 0.5和1.0 NaCl溶液中涂层的磨损率比空气中涂层的磨损率分别降低了17%和12%。而不含Ta的涂层和基体在NaCl溶液中的值比在空气中分别提高了191%和123%。这表明Ta的引入对空气和NaCl溶液中耐磨性的提高都有促进作用。
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