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<p>CoCrFeMnNiAl<sub>X</sub>Nb<sub>1-X</sub> (x = 0, 0.25, 0.5, 0.75, and 1) coatings were fabricated on AISI 1045 via laser cladding to explore the combined influence of aluminum and niobium on the microstructure and performance of CoCrFeMnNi-based coatings. It was observed that for x = 0, 0.25, 0.5, and 0.75, the coatings exhibited an FCC phase along with Laves phase precipitates, whereas at x = 1, the coating was composed solely of a BCC phase. As the value of x increased, the coating hardness initially rose and then declined, peaking at 605 HV when x = 0.5—about three times higher than that of the substrate. This enhancement primarily resulted from the synergy between solid solution and secondary phase mechanisms. Compared with the addition of Al and Nb individually into CoCrFeMnNi, the simultaneous addition of Al and Nb resulted in a more pronounced synergistic strengthening effect, significantly enhancing the corrosion resistance and wear resistance of the HEA coatings. When x = 0.5, the Laves phase content reached an optimal level with uniform distribution, and the coating exhibited the best wear resistance. At x = 0.75, the coating showed the best corrosion resistance.</p>

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Effect of Synergistic Interaction of Al and Nb on the Microstructure and Properties of Laser-Cladded CoCrFeMnNi High-Entropy Alloy Coatings

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Shenhao Wang,
  • Chuanwei Shi,
  • Lingchen Kong,
  • Xuan Hao,
  • Zhiheng Zhu,
  • Fengyuan Guo,
  • Yushuang Huo,
  • Qian Su

摘要

CoCrFeMnNiAlXNb1-X (x = 0, 0.25, 0.5, 0.75, and 1) coatings were fabricated on AISI 1045 via laser cladding to explore the combined influence of aluminum and niobium on the microstructure and performance of CoCrFeMnNi-based coatings. It was observed that for x = 0, 0.25, 0.5, and 0.75, the coatings exhibited an FCC phase along with Laves phase precipitates, whereas at x = 1, the coating was composed solely of a BCC phase. As the value of x increased, the coating hardness initially rose and then declined, peaking at 605 HV when x = 0.5—about three times higher than that of the substrate. This enhancement primarily resulted from the synergy between solid solution and secondary phase mechanisms. Compared with the addition of Al and Nb individually into CoCrFeMnNi, the simultaneous addition of Al and Nb resulted in a more pronounced synergistic strengthening effect, significantly enhancing the corrosion resistance and wear resistance of the HEA coatings. When x = 0.5, the Laves phase content reached an optimal level with uniform distribution, and the coating exhibited the best wear resistance. At x = 0.75, the coating showed the best corrosion resistance.