Microstructure,mechanical properties and corrosion behavior of quaternary Mg−1Zn−0.2Ca−xAg alloy wires applied as degradable anastomotic nails  

吻合钉用可降解四元Mg−1Zn−0.2Ca−xAg合金丝材的显微组织、力学性能和腐蚀行为

作　　者：Ying-zhong MA De-xin WANG Hong-xiang LI Chang-lin YANG Fu-song YUAN Ji-shan ZHANG 马英中;王德鑫;李宏祥;杨长林;原福松;张济山(北京科技大学新金属材料国家重点实验室,北京100083;西北工业大学凝固技术国家重点实验室,西安710072;北京大学口腔医院口腔数字化中心,北京100081)

机构地区：[1]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China [3]Center of Digital Dentistry,Peking University Hospital of Stomatology,Beijing 100081,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第1期111-124,共14页中国有色金属学报（英文版）

基　　金：The authors are grateful for the financial supports from the National Natural Science Foundation of China(51671017 and 51971020);the Beijing Municipal Natural Science Foundation,China(2202033);Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,China,the Fundamental Research Funds for the Central Universities,China(FRF-IC-19-015);the Major State Research and Development Program of China(2016YFB0300801);the Opening Research Fund of State Key Laboratory for Advanced Metals and Materials,China(2018-Z04).

摘　　要：The microstructure,mechanical properties and corrosion behavior of quaternary degradable Mg−1Zn−0.2Ca−xAg(x=1,2,4 wt.%)alloy wires,intended as anastomotic nails,were investigated.It was found that these Ag-containing alloy wires mainly consist of Mg matrix and Ag17Mg54 phase,characterized by SEM,EDS,XRD and TEM.Tensile and knotting tests results demonstrate the superior mechanical properties of these alloy wires.Especially,Mg−1Zn−0.2Ca−4Ag alloy exhibits the highest mechanical properties,i.e.an ultimate tensile strength of 334 MPa and an elongation of 8.6%.Moreover,with increasing Ag content,the corrosion rates of these alloy wires remarkably increase due to the formation of more micro-galvanic coupling between Mg matrix and Ag17Mg54 phase,shown by mass loss and scanning Kelvin probe force microscopy(SKPFM)results.The present alloy can be completely degraded within 28 d,satisfying the property requirements of anastomotic nails.研究吻合钉用Mg−1Zn−0.2Ca−xAg(x=1,2,4,%,质量分数)可降解镁合金丝材的显微组织、力学性能和腐蚀行为。通过SEM、EDS、XRD和TEM分析,发现合金主要由Mg基体和Ag17Mg54相组成。拉伸和打结试验结果表明,该合金丝材具有优良的力学性能。特别是Mg−1Zn−0.2Ca−4Ag合金的力学性能最好,其极限抗拉强度为334 MPa,伸长率为8.6%。此外,根据质量损失实验和SKPFM结果,随着Ag含量的增加,Mg基体与Ag17Mg54相之间形成微电偶,镁合金丝材的腐蚀速率显著增加。该镁合金能在28 d内在体内完全降解,各项性能均能满足吻合钉的要求。

关 键 词：Mg−Zn−Ca−Ag alloy DEGRADABILITY anastomotic nails MICROSTRUCTURE mechanical properties corrosion behavior 

分 类 号：R318.08[医药卫生—生物医学工程] TG146.22[医药卫生—基础医学]