Effect of laser surface melting on microstructure and properties of Mg-1Mn-2Zn alloy

With its excellent biocompatibility and degradability, magnesium alloy has now been widely used as a promising medical metal material in clinical medical research, but its application in this field is greatly limited by shortcomings such as too fast and uncontrollable corrosion rate and poor wear resistance of magnesium alloys. In this paper, the self-prepared Mg-1Mn-2Zn alloy was subjected to laser surface melting (LSM) under different process parameters after T6 aging treatment to study the organizational properties of Mg-1Mn-2Zn alloy before and after laser melting treatment and under different scanning speeds. The results show that after LSM, a melting layer is formed on the surface of Mg-1Mn-2Zn alloy, and the grain size of the melting layer is significantly refined, with an average size of 5 μm, and the hardness of the melting layer was improved. The second phase content was reduced, and the wear resistance and corrosion resistance of the melting layer were improved to different degrees. Relevant research can provide theoretical basis for the promotion of medical magnesium alloys.