Characterization of TiC particle reinforced magnesium matrix composites (MMCs) prepared by laser cladding based on element evaporation

Abstract

In this study, we report the preparation of AZ31/TiC composites by laser cladding based on elemental vaporization and supplementation and investigate the effects of laser process parameters and mixed powder ratio on the vaporization and spattering. It was found that the capillary pressure generated by using TiC could effectively suppress the molten pool sputtering during laser cladding. In addition, TiC particles promoted the recrystallisation behavior of the molten pool, and the grains were significantly refined from 61.58 μm to 6.46 μm. The random orientation of the recrystallized grains led to a weaker texture, decrease from 12.349 to 1.964. The microhardness of the composites higher than AZ31 from 46 to 86.2 HV0.2, and the average wear rate was reduced by 21.9%.