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<p>NiCrAlY coating was deposited on a Ti-45Al alloy through laser cladding technology. The microstructure, fretting wear mechanism, and oxidation mechanism of the coating were investigated. The results showed that the microstructure transitions from equiaxed and cellular grains to columnar grains with increasing depth from the coating surface. The microhardness of the coatings significantly increased due to refined grains and the generation of the reinforcing phase (<i>γ</i>′-Ni<sub>3</sub>Al). The fretting wear mechanism of the Ti-45Al alloy was abrasive, delamination, fatigue, and oxidation wear, while that of the NiCrAlY coating was oxidative wear, abrasive wear, and regional spalling. The higher microhardness and the formation of a glazed layer during wear enhanced the wear resistance of the NiCrAlY coating. The oxidation rate constants of the NiCrAlY coating were one order of magnitude lower than those of the Ti-45Al alloy. This indicated that the NiCrAlY coating had a better high-temperature oxidation resistance. The dense oxide layer formed by the mixture of Al<sub>2</sub>O<sub>3</sub>, Cr<sub>2</sub>O<sub>3</sub>, and spinel NiCr<sub>2</sub>O<sub>4</sub> could effectively prevent the entry of oxygen and enhance the oxidation resistance of the coating.</p>

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Fretting Wear and Oxidation Properties of NiCrAlY Coatings on an As-Cast Ti-45Al Alloy via Laser Cladding

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Daosheng Wen,
  • Hechao Lai,
  • Lei Wang,
  • Zhen Gong,
  • Beibei Kong,
  • Kun Yang,
  • Yuhang Wang,
  • Yanxing Ding,
  • Qiang Song,
  • Ziqiang Yin,
  • Shouren Wang

摘要

NiCrAlY coating was deposited on a Ti-45Al alloy through laser cladding technology. The microstructure, fretting wear mechanism, and oxidation mechanism of the coating were investigated. The results showed that the microstructure transitions from equiaxed and cellular grains to columnar grains with increasing depth from the coating surface. The microhardness of the coatings significantly increased due to refined grains and the generation of the reinforcing phase (γ′-Ni3Al). The fretting wear mechanism of the Ti-45Al alloy was abrasive, delamination, fatigue, and oxidation wear, while that of the NiCrAlY coating was oxidative wear, abrasive wear, and regional spalling. The higher microhardness and the formation of a glazed layer during wear enhanced the wear resistance of the NiCrAlY coating. The oxidation rate constants of the NiCrAlY coating were one order of magnitude lower than those of the Ti-45Al alloy. This indicated that the NiCrAlY coating had a better high-temperature oxidation resistance. The dense oxide layer formed by the mixture of Al2O3, Cr2O3, and spinel NiCr2O4 could effectively prevent the entry of oxygen and enhance the oxidation resistance of the coating.