Microstructure, interfacial characteristics and wear properties of AZ31 surface selective laser cladding AlSi10Mg coatings

Abstract

Aluminum-magnesium alloy dissimilar materials connected to make a composite structure, which can effectively make up for the shortcomings of magnesium alloy itself such as low hardness, and poor resistance to wear. The AlSi10Mg coating was successfully prepared on the surface of the AZ31 substrate by adding a transition zone using selective laser melting, which provides a new method for the composite of Mg-Al heterogeneous materials. The transition zone defects, coating microstructure, interfacial properties, and wear properties were studied. The results show that the formation of defects was mainly related to the unfused powder and oxide, and the transition layer thickness increases defects show a non-uniform increasing trend. Group A2 does not show defects and was the best parameter. It was well bonded with the substrate, and the hardness as a whole maintains a stable and high hardness value. Compared with the substrate, the wear resistance of the coating was improved, and its wear mechanism was mainly three-body wear, and the Si particles on the surface of the coating reduce the contact area of the friction pairs during sliding, which effectively improves the wear performance of the coating.