Ca和Ag的含量对可降解Zn-Li-Ca-Ag合金的组织和性能的影响

Effect of Ca and Ag Content on Microstructure and Properties of Biodegradable Alloy Zn-Li-Ca-Ag

制备可降解Zn-Li-Ca-Ag合金,使用光学显微镜(OM)、扫描电镜(SEM)、万能试验机和电化学测试等手段研究了Ca和Ag的含量对这种合金的微观组织、力学性能和耐蚀性能的影响。结果表明:Zn-Li-Ca-Ag合金的微观组织由树枝晶组成,Ca通过第二相强化使锌合金的强度提高,Ag细化枝晶使锌合金的塑性提高。Zn-0.8Li-0.1Ca-0.2Ag合金的抗拉强度达到了186 MPa。Ca和Ag都能提高锌合金的耐蚀性能。

Due to the suitable degradation rate and good biocompatibility,Zn-alloys have great potential as biomedical degradable materials.However,the low mechanical properties of pure Zn limit its development as a biomedical material.In this paper,the known degradable Zn-Li-Ca-Ag alloy was further alloyed with different amount of Ca and Ag.The microstructure,mechanical properties and corrosion resistance of the prepared Zn-Li-Ca-Ag alloys were characterized by means of optical microscopy(OM),scanning electron microscopy(SEM),universal testing machine and electrochemical tests.The results showed that the microstructure of the Zn-Li-Ca-Ag alloy was composed of dendrites.The Ca addition can improve the strength of the Zn alloy by second-phase strengthening,and the Ag addition has a positive influence on the plasticity of the Zn alloy by refining the size of the dendrites.Ca has stronger influence on the enhancement of the alloy strength rather than Ag,and amoung others,the Zn-0.8Li-0.1Ca-0.2Ag alloy exhibits the highest tensile strength(186 MPa).The co-addition of Ca and Ag can also improve the corrosion resistance of Zn alloy.