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<p>To meet the stringent high-performance requirements for coating materials in advanced manufacturing technologies, AlCoCrFeNi<sub>2.1</sub> + x(Ni<sub>3</sub>Al) (x = 0, 2.5, 5.0, 7.5, 10 wt.%) high entropy alloy (HEA) composite coatings were prepared on H13 tool steel using laser cladding. The effects of Ni<sub>3</sub>Al content addition on the microstructure, hardness, and wear mechanism of the AlCoCrFeNi<sub>2.1</sub> coating were systematically investigated. Results indicate that the coating microstructure transitions from equiaxed grains (x = 0) to dendritic grains (0 &lt; x ≤ 7.5), composed of FCC, L1<sub>2</sub>, and BCC phases, then transforms into a two-phase layered structure (x = 10) comprising FCC and L1<sub>2</sub> phases. The coating hardness significantly exceeded that of the substrate. When Ni<sub>3</sub>Al content was increased to 10 wt.%, the composite coating hardness increased by 57% and 117% compared to the AlCoCrFeNi<sub>2.1</sub> coating and H13 steel, respectively. The addition of Ni<sub>3</sub>Al substantially reduced the friction coefficient of coatings, wherein AlCoCrFeNi<sub>2.1</sub> + 10(Ni<sub>3</sub>Al) coating exhibited the best wear resistance, with a friction coefficient of 0.51 and wear rate of 5.41×10<sup>−6</sup>&#xa0;mm<sup>3</sup>N<sup>−1</sup>&#xa0;m<sup>−1</sup>. The wear mechanism shifted from abrasive wear to adhesive and oxidative wear.</p>

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Microstructure and Mechanical Properties of AlCoCrFeNi2.1+x(Ni3Al) High Entropy Alloy Composite Coatings by Laser Cladding

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Li Li,
  • Xueyun Du,
  • Xiao Wang,
  • Shumei Lou

摘要

To meet the stringent high-performance requirements for coating materials in advanced manufacturing technologies, AlCoCrFeNi2.1 + x(Ni3Al) (x = 0, 2.5, 5.0, 7.5, 10 wt.%) high entropy alloy (HEA) composite coatings were prepared on H13 tool steel using laser cladding. The effects of Ni3Al content addition on the microstructure, hardness, and wear mechanism of the AlCoCrFeNi2.1 coating were systematically investigated. Results indicate that the coating microstructure transitions from equiaxed grains (x = 0) to dendritic grains (0 < x ≤ 7.5), composed of FCC, L12, and BCC phases, then transforms into a two-phase layered structure (x = 10) comprising FCC and L12 phases. The coating hardness significantly exceeded that of the substrate. When Ni3Al content was increased to 10 wt.%, the composite coating hardness increased by 57% and 117% compared to the AlCoCrFeNi2.1 coating and H13 steel, respectively. The addition of Ni3Al substantially reduced the friction coefficient of coatings, wherein AlCoCrFeNi2.1 + 10(Ni3Al) coating exhibited the best wear resistance, with a friction coefficient of 0.51 and wear rate of 5.41×10−6 mm3N−1 m−1. The wear mechanism shifted from abrasive wear to adhesive and oxidative wear.