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<p>B<sub>4</sub>C ceramic particles are regarded as the preferred reinforcement for high-entropy alloy (HEA) with exceptional mechanical properties in the field of surface modification. In this study, CoCrFeNiSi + xB<sub>4</sub>C (<i>x</i> = 0, 4, 8, 12 and 16&#xa0;wt.%) coatings were fabricated on 45 steel substrates by plasma cladding. Utilizing x-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), microhardness tester, and friction wear testing to investigate the phase composition, microstructure, microhardness, and wear resistance of the coatings. The findings revealed that B<sub>4</sub>C particles underwent decomposition in the molten pool and reacted with Cr, Fe, Co, and Ni atoms, ultimately leading to the formation of M<sub>7</sub>C<sub>3</sub> and M<sub>2</sub>B (M = Co, Cr, Fe and Ni). M<sub>7</sub>C<sub>3</sub> and M<sub>2</sub>B phases were distributed in the interdendrites in eutectic structure. The inclusion of a quantity of B<sub>4</sub>C resulted in changes in the concentrations and shapes of M<sub>7</sub>C<sub>3</sub> and M<sub>2</sub>B. In addition, the coatings demonstrated a substantial enhancement in the average microhardness, achieving a peak value of 1246.18 HV<sub>0.3</sub> through the incorporation of an optimal quantity (8&#xa0;wt.%) of B<sub>4</sub>C. Furthermore, the friction coefficient and wear mass loss of the coating exhibited a significant reduction, decreasing from 0.36 and 15.3&#xa0;mg to 0.18 and 4.2&#xa0;mg under a 100 N loading force, and similarly declining from 0.24 and 17.1&#xa0;mg to 0.16 and 6.2&#xa0;mg under a 150 N loading force, thereby indicating a substantial improvement in the mechanical properties of the coating.</p>

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Influence of B4C Content on the Properties and Microstructure of CoCrFeNiSi High-Entropy Alloy Coatings by Plasma Cladding

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Lianwang Zhang,
  • Jianfeng Yue,
  • Zhenyang Yu,
  • Qi Sun,
  • Yang Zheng,
  • Wei Niu,
  • Ming Song,
  • Junyi Xu

摘要

B4C ceramic particles are regarded as the preferred reinforcement for high-entropy alloy (HEA) with exceptional mechanical properties in the field of surface modification. In this study, CoCrFeNiSi + xB4C (x = 0, 4, 8, 12 and 16 wt.%) coatings were fabricated on 45 steel substrates by plasma cladding. Utilizing x-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), microhardness tester, and friction wear testing to investigate the phase composition, microstructure, microhardness, and wear resistance of the coatings. The findings revealed that B4C particles underwent decomposition in the molten pool and reacted with Cr, Fe, Co, and Ni atoms, ultimately leading to the formation of M7C3 and M2B (M = Co, Cr, Fe and Ni). M7C3 and M2B phases were distributed in the interdendrites in eutectic structure. The inclusion of a quantity of B4C resulted in changes in the concentrations and shapes of M7C3 and M2B. In addition, the coatings demonstrated a substantial enhancement in the average microhardness, achieving a peak value of 1246.18 HV0.3 through the incorporation of an optimal quantity (8 wt.%) of B4C. Furthermore, the friction coefficient and wear mass loss of the coating exhibited a significant reduction, decreasing from 0.36 and 15.3 mg to 0.18 and 4.2 mg under a 100 N loading force, and similarly declining from 0.24 and 17.1 mg to 0.16 and 6.2 mg under a 150 N loading force, thereby indicating a substantial improvement in the mechanical properties of the coating.