摘要
为解决镁合金作为生物医用材料降解过快的问题.通过相图计算软件Pandat计算了Mg-Zn-Ca三元合金相图,采用熔体旋淬法制备了Mg-Zn-Ca三元合金非晶带材.利用X-射线衍射仪、透射电子显微镜和差示扫描量热仪表征了合金的非晶形成能力,通过电化学方法测试了合金的腐蚀行为.从热力学和动力学角度讨论了合金成分对非晶形成能力的影响.研究结果表明:最低共晶温度点合金的化学成分为Mg_(58)Zn_(33)Ca_9,化学成分位于相图计算深共晶点左侧的Mg_(60)Zn_(33)Ca_7合金是所研究的三个合金中液相稳定性最高和抗结晶能力最强的合金,具有最高的非晶形成能力.通过电化学腐蚀测试Mg-Zn-Ca合金的自腐蚀电流密度随着Ca含量的增加而减小,表明Mg_(57)Zn_(33)Ca_(10)合金的耐蚀性较好.
In order to solve the rapid degradation problem of magnesium alloys used as biomedical materials, Mg-Zn-Ca ternary phase diagram was calculated by Pandat software and amorphous ribbon samples were prepared by melt-spinning technique. Glass forming ability （GFA） of the studied alloys was evaluated by XRD,TEM and DSC analysis. Corrosion behaviors were tested by electrochemical test. The effect of composition on GFA was discussed from thermodynamic and kinetic aspects phases. Results showed. Chemical composition of the lowest calculated eutectic point was Mg58 Zn33 Ca9; The Mg60 Zn33 Ca7 alloy, whose composition was slightly on the left deviation of the calculated deep-eutectic point,exhibited the highest resistance to crystalline, thermal stability of liquid phase, and the maximum GFA among the three studied alloys. Electrochemical tests showed that the corrosion current density of the studied alloys decreased with increasing Ca content, the Mg57 Zn33 Ca10 alloy exhibited the best corrosion resistance among the studied alloys.
出处
《西安工业大学学报》
CAS
2017年第8期613-620,共8页
Journal of Xi’an Technological University
基金
国家自然科学基金(51201120)
陕西省科技统筹创新工程计划项目(2016KTZDGY-04-01)
关键词
Mg-Zn-Ca非晶合金
相图计算
快速凝固
结晶动力学
电化学腐蚀行为
Mg-Zn-Ca amorphous alloys
phase diagram calculation
rapid solidification process
crystalline kinetics
electrochemical corrosion behavior
