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