Zr对Mg-Zn合金力学性能及体外降解行为的影响

Effect of Zr on mechanical properties and in vitro degradation behavior of Mg-Zn alloy

制备Mg-2.5wt%Zn和Mg-2.5wt%Zn-0.5wt%Zr合金,对其微观组织、力学性能和体外降解行为进行对比。结果表明,Zr元素对Mg-Zn合金的细化作用显著,合金的晶粒尺寸由60μm减小到20μm。添加Zr使Mg-Zn合金的强度、塑性和硬度均有所提高,其抗拉强度和伸长率分别达到315 MPa和21.4%。经体外降解测试,Mg-2.5wt%Zn-0.5wt%Zr合金的平均降解速率为3.32 mm/a,其耐蚀性优于Mg-2.5wt%Zn合金。

Mg-2.5wt%Zn and Mg-2.5wt%Zn-0.5wt%Zr alloys were fabricated for comparing their microstructure,mechanical properties and in vitro degradation behavior.The results show that Zr can significantly refine the grain,the grain size of alloy decreases from 60 μm to 20 μm.The mechanical properties of Mg-Zn alloys are improved with the addition of Zr.The tensile strength and elongation of Mg-2.5wt%Zn-0.5wt%Zr alloy are 315 MPa and 21.4% respectively.The average degradation rate of Mg-2.5wt%Zn-0.5wt%Zr alloy is 3.32 mm/a after in vitro degradation measure,which demonstrates that its corrosion resistance is better than Mg-2.5wt%Zn alloy.