Laser cladding of Y powder on pure aluminium surface

In order to improve the surface properties of aluminum,the Al-Y alloy coating was fabricated by laser cladding directly melting the preplaced Y powder on substrate.With optimum process parameters,the coating layer with good metallurgical bonding performance was formed,and the grain size in cladding layer was smaller than the substrate.The microstructure characteristics of coating layer were studied by using metallogenetic microscope,energy disperse spectroscopy,X-ray diffraction and micro-hardness analysis.The results showed that the surface modified layer consisted of some inter-metallic compound phase,such as YAl3,Y4Al2O9.The micro-hardness of the coating ranging from 43HV0.2 to 58HV0.2,was 50%~60% higher than that of the substrate,ranging from 30HV0.2 to 40HV0.2.The highest hardness was obtained in the top of the coating.It can be concluded that the surface properties of aluminum can be improved by laser cladding Y powers.