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Abstract <p>NiCoCrTi<sub>0.5</sub>Nb<sub>0.5</sub> high-entropy alloy coatings with different SiO<sub>2</sub> content (4, 8, and 16 wt %) (defined as <i>C</i>1, <i>C</i>2, and <i>C</i>3) are well synthesized on the surface of 45 steel by laser cladding. The microstructure characteristics, phase transition, microhardness, friction behavior and wear characteristics of NiCoCrTi<sub>0.5</sub>Nb<sub>0.5 –</sub> <sub><i>x</i></sub>SiO<sub>2</sub> high-entropy alloy coatings have been comprehensively analyzed. The study indicates that NiCoCrTi<sub>0.5</sub>Nb<sub>0.5 –</sub> <sub><i>x</i></sub>SiO<sub>2</sub> coatings, without macroscopic defects, are well metallurgically bonded to the substrate. Each NiCoCrTi<sub>0.5</sub>Nb<sub>0.5 –</sub> <sub><i>x</i></sub>SiO<sub>2</sub> coating is composed of FCC solid solution and Nb<sub>3</sub>Si compound. With the increase of SiO<sub>2</sub> content, the ordering transformation is obvious, and the microstructure changes from equiaxed crystals to dendritic crystals. The microhardness of NiCoCrTi<sub>0.5</sub>Nb<sub>0.5 –</sub> <sub><i>x</i></sub>SiO<sub>2</sub> coatings is much higher than that of the substrate. As SiO<sub>2</sub> content increases, the microhardness of NiCoCrTi<sub>0.5</sub>Nb<sub>0.5 –</sub> <sub><i>x</i></sub>SiO<sub>2</sub> coating increases. Simultaneously, the wear resistance of NiCoCrTi<sub>0.5</sub>Nb<sub>0.5 –</sub> <sub><i>x</i></sub>SiO<sub>2</sub> coating improves with the decrease of maximum wear depth, roughness and wear rate. It is obvious that <i>C</i>3 has the broad prospects for application in high-friction conditions.</p>

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Microstructure and Tribological Behavior of NiCoCrTi0.5Nb0.5 – xSiO2 High-Entropy Alloy Based Composite Coatings

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Y. Zhang,
  • W. T. Hou,
  • J. C. Yu,
  • B. W. Fan

摘要

Abstract

NiCoCrTi0.5Nb0.5 high-entropy alloy coatings with different SiO2 content (4, 8, and 16 wt %) (defined as C1, C2, and C3) are well synthesized on the surface of 45 steel by laser cladding. The microstructure characteristics, phase transition, microhardness, friction behavior and wear characteristics of NiCoCrTi0.5Nb0.5 – xSiO2 high-entropy alloy coatings have been comprehensively analyzed. The study indicates that NiCoCrTi0.5Nb0.5 – xSiO2 coatings, without macroscopic defects, are well metallurgically bonded to the substrate. Each NiCoCrTi0.5Nb0.5 – xSiO2 coating is composed of FCC solid solution and Nb3Si compound. With the increase of SiO2 content, the ordering transformation is obvious, and the microstructure changes from equiaxed crystals to dendritic crystals. The microhardness of NiCoCrTi0.5Nb0.5 – xSiO2 coatings is much higher than that of the substrate. As SiO2 content increases, the microhardness of NiCoCrTi0.5Nb0.5 – xSiO2 coating increases. Simultaneously, the wear resistance of NiCoCrTi0.5Nb0.5 – xSiO2 coating improves with the decrease of maximum wear depth, roughness and wear rate. It is obvious that C3 has the broad prospects for application in high-friction conditions.