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<p>To further enhance the wear resistance of HEAs, laser cladding technology was employed to prepare AlCoCrFeNi high-entropy alloy coatings reinforced with different mass fractions (0, 6, 12, 18, and 24 wt.%) of Nb and B<sub>4</sub>C. The addition of Nb and B<sub>4</sub>C promotes the in situ formation of hard reinforcing phases, including NbC, NbB<sub>2</sub>, and CrB<sub>2</sub>. As the content of these reinforcing phases increased, the coating’s microstructure evolved from conventional equiaxed grains to a composite structure enriched with dendritic, rodlike, and granular reinforcing phases. Consequently, the hardness and wear resistance were markedly improved. At 24 wt.% addition, the average microhardness of the coating reached 1293 HV0.3, which is 3.1 times higher than that of the pure high-entropy alloy coating, while its wear resistance increased by a factor of 16.1. Concurrently, the wear mechanism shifted from severe plowing and adhesive wear to mild abrasive wear and microfatigue wear. These results confirm that composite reinforcement with Nb and B<sub>4</sub>C is an effective strategy for enhancing the overall performance of high-entropy alloy coatings.</p>

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Enhanced Wear Resistance and Hardness of Laser Cladding In Situ Synthesized NbC-Reinforced AlCoCrFeNi Coating

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Han Yantao,
  • Wan Zhandong,
  • Wang Kaiming,
  • Lin Jian,
  • Fu Hanguang

摘要

To further enhance the wear resistance of HEAs, laser cladding technology was employed to prepare AlCoCrFeNi high-entropy alloy coatings reinforced with different mass fractions (0, 6, 12, 18, and 24 wt.%) of Nb and B4C. The addition of Nb and B4C promotes the in situ formation of hard reinforcing phases, including NbC, NbB2, and CrB2. As the content of these reinforcing phases increased, the coating’s microstructure evolved from conventional equiaxed grains to a composite structure enriched with dendritic, rodlike, and granular reinforcing phases. Consequently, the hardness and wear resistance were markedly improved. At 24 wt.% addition, the average microhardness of the coating reached 1293 HV0.3, which is 3.1 times higher than that of the pure high-entropy alloy coating, while its wear resistance increased by a factor of 16.1. Concurrently, the wear mechanism shifted from severe plowing and adhesive wear to mild abrasive wear and microfatigue wear. These results confirm that composite reinforcement with Nb and B4C is an effective strategy for enhancing the overall performance of high-entropy alloy coatings.