Effect of Y2O3 Addition on Microstructure and Properties of Laser Cladded Al-Si Coatings on AZ91D Magnesium Alloy

The effect of Y2O3 addition on the microstructure and properties of the laser cladded Al-Si alloy coating on the surface of AZ91D magnesium alloy was investigated in this study. The experimental results showed that the Al-Si + Y2O3 cladding layers contained alpha-Mg, Mg2Si, Al4MgY and a small amount of Al12Mg17 phases. The coarse dendrites, reticulated eutectic structures and massive phases in the coatings tended to be refined and gradually uniformly distributed with the increased amount of Y2O3. The introduction of Y2O3 into the cladding layer favored the improvement of microhardness and wear resistance due to the grain refinement strengthening and dispersion strengthening. The addition of Y2O3 also promoted the reduction of localized corrosion sites and made the corrosion surface smoother, implying that the corrosion resistance of the Y2O3-modified coatings was better than that of the unmodified cladding layer.

Automated summary

The effect of Y2O3 addition on the microstructure and properties of laser cladded Al-Si alloy coating on AZ91D magnesium alloy surface was investigated. The experimental results showed that the cladding layers with Al-Si + Y2O3 contained alpha-Mg, Mg2Si, Al4MgY, and a small amount of Al12Mg17 phases. The coarse dendrites, reticulated eutectic structures, and massive phases in the coatings were refined and distributed more uniformly with the increased amount of Y2O3. Y2O3 addition improved the microhardness, wear resistance, and corrosion resistance of the coatings.