摘要
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.
Abstract
Due to the suitable degradation rate and good biocompatibility,Zn-alloys have great po-tential as biomedical degradable materials.However,the low mechanical properties of pure Zn limit its de-velopment as a biomedical material.In this paper,the known degradable Zn-Li-Ca-Ag alloy was further al-loyed with different amount of Ca and Ag.The microstructure,mechanical properties and corrosion resis-tance of the prepared Zn-Li-Ca-Ag alloys were characterized by means of optical microscopy(OM),scan-ning 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 in-fluence 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 al-loy exhibits the highest tensile strength(186 MPa).The co-addition of Ca and Ag can also improve the corrosion resistance of Zn alloy.
基金项目
国家重点研发计划(2020YFC1107501)
国家自然科学基金(51971222)
STS项目(20201600200042)
东莞市创新研究团队计划()
辽宁省应用基础研究计划(2022020347-JH2/1013)
维普
万方数据