Improving the Wear Resistance of AZ31B Magnesium Alloy by Laser Cladding with Al-Si/Al_2O_3-TiO_2 Po

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To improve the wear resistance of magnesium alloy,the laser surface cladding of AZ31B magnesium alloy with Al-12 % Si and Al2O3-40 % TiO2 composite powders (in the wt.% ratio of 10:1,6:1,4:1) were investigated by using a 5kW continuous wave CO2 laser.A detailed microstructure and phase analysis of the surface modified layer were studied by optics microscopy(OM),scanning electron microscopy(SEM),energy dispersive spectroscopy (EDS),X-ray diffraction(XRD).The microstructure of the surface modified layers mainly consist of Al-Mg matrix,dendrite precipitates and Al2O3,TiO2 ceramic particles.The microhardness of the surface layer were measured and wear resistance property were evaluated in details.The average microhardness of the surface layers were significantly improved to 250HV0.05 as compared with 50HV0.05 of the AZ31B substrate.The results showed that the wear resistance of the laser surface modified samples was considerably improved as compared as the as-received specimen. To improve the wear resistance of magnesium alloy, the laser surface cladding of AZ31B magnesium alloy with Al-12% Si and Al2O3-40% TiO2 composite powders in the wt.% Of 10: 1, 6: 1, 4: 1 ) were investigated by using a 5kW continuous wave CO2 laser. A detailed microstructure and phase analysis of the surface modified layers were studied by optics microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD). The microstructure of the surface modified layers mainly consisting of Al-Mg matrix, dendrite precipitates and Al2O3, TiO2 micro-particles of the surface layer were measured and wear resistance properties were evaluated in details.The average microhardness of the surface layers were significantly improved to 250 HV0.05 as compared with 50 HV0.05 of the AZ31B substrate.The results showed that the wear resistance of the laser surface modified samples was considerably improved as compared as the as-received specimen.
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