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<p>Laser cladding can significantly improve the properties of the material surface and prolong the working life of components. In this paper, the microstructure and performance of FeCoCrNiAl high-entropy alloy (HEA) coatings were investigated by using the external magnetic field-assisted laser cladding on the Invar alloy. The influence of the magnetic field intensity on the phase composition, microstructure evolution, mechanical, thermal expansion, and wear resistance was studied. The results indicate that the applied magnetic field significantly refines dendritic microstructures, reduces elemental segregation, and promotes FCC phase formation due to suppressed Marangoni convection and enhanced thermal stability. Magnetic fields also induce magnetostrictive effects, lowering lattice expansion and thermal stress, thereby improving crack resistance. The 30&#xa0;mT-assisted coating exhibited the highest nanohardness, and reduced elastic modulus and wear volume compared with a non-magnetic sample. Digital image correlation (DIC) analysis confirmed a 58% decrease in residual stress with magnetic assistance, aligning with theoretical models of strain suppression. These findings demonstrate that a magnetic field-assisted laser cladding optimizes HEA coatings for high-performance applications requiring thermal stability, mechanical durability, and wear resistance.</p>

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Magnetic Field-Assisted Laser Cladding of FeCoCrNiAl High-Entropy Alloy Coatings on Invar Steel Substrate

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Kang Qi,
  • Zhaowei Yang,
  • Ying Zhang,
  • Guoli Li,
  • Kun Li,
  • Xiaotong Yao,
  • Long Jiang

摘要

Laser cladding can significantly improve the properties of the material surface and prolong the working life of components. In this paper, the microstructure and performance of FeCoCrNiAl high-entropy alloy (HEA) coatings were investigated by using the external magnetic field-assisted laser cladding on the Invar alloy. The influence of the magnetic field intensity on the phase composition, microstructure evolution, mechanical, thermal expansion, and wear resistance was studied. The results indicate that the applied magnetic field significantly refines dendritic microstructures, reduces elemental segregation, and promotes FCC phase formation due to suppressed Marangoni convection and enhanced thermal stability. Magnetic fields also induce magnetostrictive effects, lowering lattice expansion and thermal stress, thereby improving crack resistance. The 30 mT-assisted coating exhibited the highest nanohardness, and reduced elastic modulus and wear volume compared with a non-magnetic sample. Digital image correlation (DIC) analysis confirmed a 58% decrease in residual stress with magnetic assistance, aligning with theoretical models of strain suppression. These findings demonstrate that a magnetic field-assisted laser cladding optimizes HEA coatings for high-performance applications requiring thermal stability, mechanical durability, and wear resistance.