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<p>To enhance the surface performance of Mg alloy, Al<sub>X</sub>CoCr<sub>0.5</sub>MnNiTi<sub>0.5</sub>/Al-Ni gradient coatings were successfully prepared by laser cladding. The design of the transition coating effectively prevented the dilution of Mg. The research results showed that the Al<sub>X</sub>CoCr<sub>0.5</sub>MnNiTi<sub>0.5</sub> coatings were composed of a single BCC (Al-Ni) phase with petal-like grains. Besides, due to laser remelting, the Al-Ni remelted zone exhibited fine round grains, while the Al-Ni coating displayed needle-like grains. Compared with the substrate, the microhardness and wear volume of the HEA coatings increased by 8.17 to 8.80 times and decreased by 0.62 to 0.82 times, respectively. Among these, Al<sub>1.50</sub>CoCr<sub>0.5</sub>MnNiTi<sub>0.5</sub> had the highest microhardness and wear resistance because of solid solution strengthening, fine grain strengthening and second phase dispersion strengthening. In addition, the polarization curve indicates that the self-corrosion current decreased by 2 to 3 orders of magnitude. Nyquist plots and Bode plots also indicated that the corrosion resistance of the HEA coatings was superior to that of the substrate and the Al-Ni layer.</p>

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Wear and Corrosion Resistance of Laser Cladding AlXCoCr0.5MnNiTi0.5/Al-Ni Functionally Gradient Coating on AZ91HP

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Yali Gao,
  • Xin Li,
  • Yu Liu,
  • Dongdong Zhang,
  • Shan Jiang,
  • Xiuzhe Han

摘要

To enhance the surface performance of Mg alloy, AlXCoCr0.5MnNiTi0.5/Al-Ni gradient coatings were successfully prepared by laser cladding. The design of the transition coating effectively prevented the dilution of Mg. The research results showed that the AlXCoCr0.5MnNiTi0.5 coatings were composed of a single BCC (Al-Ni) phase with petal-like grains. Besides, due to laser remelting, the Al-Ni remelted zone exhibited fine round grains, while the Al-Ni coating displayed needle-like grains. Compared with the substrate, the microhardness and wear volume of the HEA coatings increased by 8.17 to 8.80 times and decreased by 0.62 to 0.82 times, respectively. Among these, Al1.50CoCr0.5MnNiTi0.5 had the highest microhardness and wear resistance because of solid solution strengthening, fine grain strengthening and second phase dispersion strengthening. In addition, the polarization curve indicates that the self-corrosion current decreased by 2 to 3 orders of magnitude. Nyquist plots and Bode plots also indicated that the corrosion resistance of the HEA coatings was superior to that of the substrate and the Al-Ni layer.