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<p>The present study examined the effects of Nb addition on phase composition, microstructure, microhardness, friction-wear characteristics, and corrosion resistance in FeCoNiCuAl high-entropy alloy coatings. A series of FeCoNiCuAlNb<sub><i>x</i></sub> coatings (<i>x</i> = 0, 0.5, 1.0, 1.5, and 2.0) were prepared on 65Mn substrates by laser cladding with powder bed deposition. The samples were characterized using XRD, metallographic microscopy, Vickers hardness measurements, wear testing under sliding conditions, and electrochemical techniques. Results indicated that the Nb-free FeCoNiCuAl coating exhibited a single FCC phase structure. As Nb content increased, both FCC and Laves phases appeared. The microstructure became fine rand denser with higher Nb content. The microhardness of the FeCoNiCuAlNb<sub>1.5</sub> coating reached 615.74 HV<sub>0.2</sub>. Electrochemical tests in NS4 solution revealed an increase inself-corrosion potential from − 0.471&#xa0;V for FeCoNiCuAl to − 0.194&#xa0;V for FeCoNiCuAlNb<sub>2.0</sub>, while the self-corrosion current density decreased from 1.039 × 10<sup>−5</sup> to 3.239 × 10<sup>−6</sup> A/cm<sup>2</sup>. In summary, Nb addition promoted the phase transition from FCC to Laves and enhanced microhardness and wear resistance.</p>

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Study on Microstructure and Properties of FeCoNiCuAlNbx High-Entropy Alloy Composite Coatings by Laser Cladding

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Chun Guo,
  • Xinyu Zhang,
  • Guangcan Huang,
  • Ruizhang Hu,
  • Qingcheng Lin,
  • Lu Tianyuan

摘要

The present study examined the effects of Nb addition on phase composition, microstructure, microhardness, friction-wear characteristics, and corrosion resistance in FeCoNiCuAl high-entropy alloy coatings. A series of FeCoNiCuAlNbx coatings (x = 0, 0.5, 1.0, 1.5, and 2.0) were prepared on 65Mn substrates by laser cladding with powder bed deposition. The samples were characterized using XRD, metallographic microscopy, Vickers hardness measurements, wear testing under sliding conditions, and electrochemical techniques. Results indicated that the Nb-free FeCoNiCuAl coating exhibited a single FCC phase structure. As Nb content increased, both FCC and Laves phases appeared. The microstructure became fine rand denser with higher Nb content. The microhardness of the FeCoNiCuAlNb1.5 coating reached 615.74 HV0.2. Electrochemical tests in NS4 solution revealed an increase inself-corrosion potential from − 0.471 V for FeCoNiCuAl to − 0.194 V for FeCoNiCuAlNb2.0, while the self-corrosion current density decreased from 1.039 × 10−5 to 3.239 × 10−6 A/cm2. In summary, Nb addition promoted the phase transition from FCC to Laves and enhanced microhardness and wear resistance.