Microstructures and Properties of Biomedical Mg-Zn-Sn-Zr Rolled Alloys

The as-cast Mg-2.0Zn-1.5Sn-xZr(x= 0,0.4, 0.6, 0.8, 1.0 wt%) alloy was rolled with the pressure less than 5% each time. The microstructure, mechanical properties, corrosion properties and biocompatibility of the alloy were investigated. The microstructure of the alloy was observed and analyzed by scanning electron microscope, and the tensile test was carried out by universal tensile machine. The corrosion resistance of the alloy in Hank's solution was studied by hydrogen evolution experiment and electrochemical test, and the biocompatibility of the alloy was tested by L929 cells. The results show that Mg-2Zn-1.5Sn-xZr alloy has excellent mechanical properties. The elongation of Mg-2Zn-1.5Sn-xZr alloy decreases with the increase of Zr content, but the tensile strength first increases and then decreases with the increase of Zr concentration. When the Zr content is 0.8 wt%, the maximum tensile strength of the alloy is 235 MPa. The results of hydrogen evolution experiment and electrochemical analysis show that the corrosion resistance of the alloy is the best when the Zr content is 0.8 wt%, and all the five alloys have high biocompatibility. In conclusion, the rolled alloy has good properties and has broad application prospects in the field of biomaterials.