Mg,Ca元素对可降解Zn合金组织性能影响  

Effect of Mg,Ca Addition on Microstructure and Properties of Biodegradable Zn Alloy

作　　者：王利卿 孙世能[1,2] 任玉平 秦高梧[1,2] 

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2018年第1期35-39,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51371046;51525101);中央高校基本科研业务费专项资金资助项目(N141008001)

摘　　要：采用X射线衍射、扫描电子显微镜、光学显微镜、室温拉伸和浸泡失重法研究了挤压态纯Zn和Zn-0.2Mg-x Ca(x=0,0.06,0.15,0.3)(质量分数)合金微观组织、力学性能和体外降解速率.结果表明:200℃挤压后,纯Zn晶粒尺寸达到100μm;Zn-0.2Mg-x Ca合金中晶粒尺寸均维持在15~20μm之间,并存在第二相Mg2Zn11和Ca Zn13.随着Ca含量增加,Ca Zn13含量逐渐增加,且当Ca质量分数达到0.15%以上时Ca Zn13尺寸达到15~50μm.纯Zn的屈服强度和延伸率分别为64 MPa和14%,Zn-0.2Mg-x Ca合金随着Ca含量增加屈服强度由180 M Pa提高到约200 M Pa,延伸率则逐渐由18%降低到6%.纯Zn和Zn-0.2M gx Ca合金在SBF溶液中降解速率维持在0.05~0.15 mm·a-1,而且随Ca的添加降解速率略有降低.Pure Zn and Zn-0. 2Mg- xCa （x = 0,0. 06,0. 15 and 0. 3 ,mass fraction） alloys were prepared by indirect hot extrusion. The microstructure,mechanical properties and in vitro degradation rate of extruded Zn-based alloys were investigated by X-ray diffraction,scanning electron microscopy,optical microscope,tensile test and immersion test. The results showed that pure Zn consisted of equiaxed grains with the size of 100 pm and Zn -0. 2Mg - xCa alloys were composed of refined grains with the size of 15 -20 pm and the second phases of MgqZnn and CaZn, 3. With increasing Ca addition,the amount of CaZn13 increased and the size of CaZn13 reached 15 ？50 pm when the Ca mass fraction was over 0. 15% . The yield strength and elongation of pure Zn was 64 MPa and 14%, respectively. With increasing Ca addition,the yield strength of Zn - 0. 2Mg - xCa increased from 180 MPa to 200 MPa, while the elongation decreased from 18% to 6% . The degradation rate of Zn and Zn - 0. 2Mg - xCa kept between 0.05 -0.15 mm·a-1 and decreased with Ca addition.

关 键 词：Zn-Mg-Ca合金 反向热挤压 显微组织 力学性能 降解速率 

分 类 号：TG146.1[一般工业技术—材料科学与工程]