The Effect of Heat Treatment and Extrusion on Microstructure and Properties of Medical Mg-1Mn-2Zn Alloy

Magnesium alloy with its excellent biocompatibility and degradability has been widely used in clinical medical research as a highly promising medical metal material, but when the composition of magnesium alloy is different, the performance of magnesium alloys also has the huge difference. At the same time, the poor mechanical properties and corrosion resistance of cast magnesium alloys do not allow them to be used directly as implants. In this paper, Mg-1Mn-2Zn alloys were prepared by self-research, and the prepared magnesium alloy was subjected to heat treatment and extrusion composite strengthening to improve its performance. The improvement of mechanical properties of magnesium alloy was investigated by hardness, residual stress and tensile bending tests. Then, fretting wear test and electrochemical corrosion test were carried out, and the corrosion products were analyzed. The results show that the mechanical properties and corrosion resistance of the alloy are greatly improved, and the alloy has good degradability and biocompatibility. This provides theoretical guidance and practical guidance for the preparation, strengthening and application of high-performance medical magnesium alloys.