生物医用Mg-3Zn-0.2Ca合金显微组织与性能研究（英文）  

Microstructure and Properties of Mg-3Zn-0.2Ca Alloy for Biomedical Application

作　　者：杨敏[1] 刘德宝[1] 张润芳[1] 陈民芳[1] 

机构地区：[1]天津理工大学,天津300384

出　　处：《稀有金属材料与工程》2018年第1期93-98,共6页Rare Metal Materials and Engineering

基　　金：National Natural Sciences Foundation of China(51271131);Key Projects Supported by Tianjin Science and Technology(15ZCZDSY00920)

摘　　要：针对生物医用Mg-3Zn-0.2Ca的显微组织、力学性能以及生物腐蚀行为,采用X射线衍射(XRD)、光学显微镜(OM)、扫描电镜(SEM)、拉伸实验机、电化学以及浸泡测试方法进行了研究。XRD结果表明Mg-3Zn-0.2Ca合金中的第二相主要为Mg_7Zn_3,Mg_2Zn_3,Mg_4Zn_7等金属间化合物相。相比于铸态,经过56:1挤压比变形后的Mg-3Zn-0.2Ca合金晶粒明显细化,平均晶粒尺寸从119.1μm降到2.5μm,降低了47.6倍。挤压态Mg-3Zn-0.2Ca合金的屈服强度(0.2%TYS)、抗拉强度以及延伸率分别为205,336 MPa和17.85%,电化学以及浸泡测试表明挤压态合金的耐蚀性明显优于铸态Mg-3Zn-0.2Ca合金,其主要归因于晶粒细化。新设计的生物医用Mg-3Zn-0.2Ca合金呈现出了良好的综合力学性能以及生物耐蚀性。Microstructure, mechanical properties and bio-corrosion properties of Mg-3Zn-0.2Ca alloys were investigated for biomedical application by X-ray diffraction （XRD）, optical microscopy （OM）, scanning electronic microscopy （SEM）, mechanical properties testing, electrochemical and immersion measurement. The XRD shows that the main second phases in the alloy are Mg-Zn intermetallic compounds such as Mg7Zn3, Mg2Zn3, and Mg4nT. In comparison with the cast alloy, the average grain size of the extruded Mg-3Zn-0.2Ca alloy is significantly decreased by 47.6 times from 119.1 pxn to 2.5 n after extrusion ratio 56：1 deformation. The tensile yield strength （0.2%TYS）, ultimate tensile strength and elongation of the extrude alloys are 205 MPa, 336 MPa and 17.85%, respectively. The electrochemical and the immersion tests show that the corrosion resistance of the extruded alloy is obviously higher than that of the cast alloy due to the fine grained microstructure. The newly designed Mg-3Zn-0.2Ca alloy exhibits the good combination of mechanical performance and corrosion resistance for biomedical application.

关 键 词：Mg-Zn-Ca合金 显微组织 力学性能 生物腐蚀行为 

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]