Gd与Zr对WE43镁合金组织、力学及腐蚀性能的影响

Influence of Gd and Zr on microstructures,mechanical and corrosion properties of WE43 magnesium alloy

为了研究WE43镁合金作为生物材料的可行性,研究了Zr和Gd元素对WE43挤压态镁合金组织、力学性能和腐蚀性能的影响.采用金相显微镜和扫描电镜观察了挤压态镁合金的微观组织,采用拉伸实验和浸泡实验分别测试了镁合金的力学性能与腐蚀性能.结果表明:Zr元素对镁合金的挤压态组织具有显著细化作用;当进一步加入Gd元素后,组织细化作用不明显.在WE43镁合金中加入Zr元素后,镁合金的抗拉强度和屈服强度分别提高了约22%和15%.进一步添加Gd元素后镁合金的抗拉强度和屈服强度分别达到了262 MPa和200 MPa,且分别提高了约29%和33%.相反,Zr和Gd元素的加入降低了镁合金的伸长率,同时并未提高镁合金的耐蚀性.

In order to investigate the feasibility of WE43 magnesium alloy as a biomedical material,the effect of Zr and Gd elements on the microstructures,mechanical and corrosion properties of extruded WE43 magnesium alloy was studied.The microstructures of extruded magnesium alloy were observed with metallurgical microscope and scanning electron microscope(SEM),and the mechanical and corrosion properties of magnesium alloy were tested with tensile and immersion tests,respectively.The results show that Zr can refine the microstructures of extruded magnesium alloy,while further addition of Gd has no significant refinement effect.After adding Zr into WE43 magnesium alloy,the ultimate tensile and yield strengths of magnesium alloy increase by about 22%and 15%,respectively;further addition of Gd can improve the tensile and yield strengths of magnesium alloy to 262 MPa and 200 MPa,and the increments are as high as about 29%and 33%,respectively.On the contrary,the addition of Zr and Gd reduces the elongation of magnesium alloy,and does not enhance the corrosion properties of magnesium alloy at the same time.