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<p>FeCoCrNiMnTi<sub>x</sub>Al<sub>(1–<i>x</i>)</sub> (<i>x</i> = 1, 0.75, 0.5, 0.25, 0) high-entropy alloy coatings were fabricated on 45# steel substrates by laser cladding. Phase and microstructure of the coating were analyzed by XRD, SEM, EDS, and EBSD. The results show that Ti and Al form solid solutions with the other constituent elements, providing solid-solution strengthening, while Ti preferentially reacts with C to generate TiC particles that create secondary-phase dispersion strengthening. Simultaneously, grain refinement further enhances the mechanical properties of the coatings. The continuous addition of Al leads to phase transition (FCC → FCC + BCC → BCC). The grain refinement effect is significant, with an average grain diameter of 4.1&#xa0;μm at <i>x </i>= 0.5. At <i>x</i> = 0.25, the microhardness increases 2.4-fold and the wear resistance improves by a factor of 6.9. The corrosion resistance initially rises and then declines with further Al addition, reaching its optimum at <i>x</i> = 0.5.</p> Graphical abstract <p></p>

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Regulating the microstructure and properties of laser cladding FeCoCrNiMn high-entropy alloys via Ti and Al content control

  • 期刊论文

  • 发表日期：

    2026年1月9日

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

摘要

FeCoCrNiMnTixAl(1–x) (x = 1, 0.75, 0.5, 0.25, 0) high-entropy alloy coatings were fabricated on 45# steel substrates by laser cladding. Phase and microstructure of the coating were analyzed by XRD, SEM, EDS, and EBSD. The results show that Ti and Al form solid solutions with the other constituent elements, providing solid-solution strengthening, while Ti preferentially reacts with C to generate TiC particles that create secondary-phase dispersion strengthening. Simultaneously, grain refinement further enhances the mechanical properties of the coatings. The continuous addition of Al leads to phase transition (FCC → FCC + BCC → BCC). The grain refinement effect is significant, with an average grain diameter of 4.1 μm at x = 0.5. At x = 0.25, the microhardness increases 2.4-fold and the wear resistance improves by a factor of 6.9. The corrosion resistance initially rises and then declines with further Al addition, reaching its optimum at x = 0.5.

Graphical abstract