Effect of Mn on microstructures and properties of backward extruded Zn-0.5 Mg alloys
Chi Xiao, Shineng Sun, Dehui Meng, Yuping Ren, Yiheng Zheng, Yun Peng Su, Baoyi Liu, Haochun Zhang
Abstract
Zn-based alloys have gradually attracted extensive concern due to its suitable degradation rate and good biocompatibility. These alloys have become a new type of biodegradable material following Mg-based alloys and Fe-based alloys. However, the mechanical properties of pure Zn are poor, so the binary and ternary Zn-based alloys with Mg, Mn as alloying elements have been developed and studied. In this paper, Zn-0.5 Mg-xMn (x = 0.5, 1.0, 1.5 wt%) alloys were prepared by backward extrusion approach. The Mg 2 Zn 11 s phase exists in the Zn-0.5 Mg-xMn alloys. With the increase of Mn content, the average grain size of Zn-0.5 Mg-xMn alloys is obviously refined, and the MnZn 13 phase gradually increases and the texture strength is weakened. The yield strength, ultimate tensile strength, and elongation of Zn-0.5Mg-0.5Mn alloy are 258 MPa, 338 MPa, and 22.5 %, respectively. The corrosion rate of Zn-0.5Mg-0.5Mn alloy is about 0.05 mm/y. The results indicate that the Zn-0.5Mg-0.5Mn alloy is expected to be a promising biodegradable biomaterial.