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<p>Al-based composite coatings with fine crystalline microstructures were fabricated on the surface of AZ31B Mg alloy substrate via laser cladding using a semiconductor cooling platform. The effects of Y<sub>2</sub>O<sub>3</sub> on the microstructure and mechanical properties of the Al-based composite laser-clad coatings were investigated by incorporating trace amounts of Y<sub>2</sub>O<sub>3</sub> into the alloy powder. Microstructural evolution in the Al-based composite coatings with different Y<sub>2</sub>O<sub>3</sub> additions was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). Variations in the coatings’ mechanical performance—including microhardness and wear resistance—were assessed through Vickers microhardness testing and reciprocating dry-friction wear experiments. Trace amounts of Y<sub>2</sub>O<sub>3</sub> were found to significantly influence both the microstructure and mechanical behavior of the Al-based composite laser-clad coatings. The coating with 1.5 wt% Y<sub>2</sub>O<sub>3</sub> exhibited the highest average microhardness of 279.97 HV<sub>0.05</sub>, while the coating containing 1 wt% Y<sub>2</sub>O<sub>3</sub> demonstrated optimal dry-friction wear performance, with a wear mass of 0.8&#xa0;mg and a friction coefficient of 0.3329.</p>

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Impact of Y2O3 Addition on the Microstructures and Mechanical Properties of Al-based Composite Coatings Fabricated by Laser Cladding on AZ31B Mg Alloy

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Yanchen He,
  • Zhongkui Shao,
  • Xiaoli Shen,
  • Lyupan Zhu,
  • Qiwei Yang

摘要

Al-based composite coatings with fine crystalline microstructures were fabricated on the surface of AZ31B Mg alloy substrate via laser cladding using a semiconductor cooling platform. The effects of Y2O3 on the microstructure and mechanical properties of the Al-based composite laser-clad coatings were investigated by incorporating trace amounts of Y2O3 into the alloy powder. Microstructural evolution in the Al-based composite coatings with different Y2O3 additions was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). Variations in the coatings’ mechanical performance—including microhardness and wear resistance—were assessed through Vickers microhardness testing and reciprocating dry-friction wear experiments. Trace amounts of Y2O3 were found to significantly influence both the microstructure and mechanical behavior of the Al-based composite laser-clad coatings. The coating with 1.5 wt% Y2O3 exhibited the highest average microhardness of 279.97 HV0.05, while the coating containing 1 wt% Y2O3 demonstrated optimal dry-friction wear performance, with a wear mass of 0.8 mg and a friction coefficient of 0.3329.