摘要
采用扫描电子显微镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)研究了固溶处理对Mg-2Nd-0.5Zn-0.4Zr和Mg-2Nd-0.5Zn-0.4Zr-3Y两种镁合金显微组织的影响,通过析氢、质量损失测试及电化学方法研究其在模拟体液(SBF)中的生物腐蚀性能;并对比分析了稀土Y的添加对镁合金组织及腐蚀性能的影响。结果表明:经过固溶处理后,合金的大部分析出相溶于基体,其在SBF中腐蚀速率仅为铸态合金的44.35%和46.67%;添加稀土Y使合金中析出相增多,出现新的块状析出相Mg24Y5,合金的耐生物腐蚀性能得到提高。
The effects of solution treatment( T4) on microstructure of Mg-2Nd-0. 5Zn-0. 4Zr and Mg-2Nd-0. 5Zn-0. 4Zr-3Y magnesium alloys were studied by means of scanning electronic microscopy( SEM),energy spectrum analysis( EDS),X-ray diffraction( XRD). The biocorrosion properties of the alloys in the simulated body fluid( SBF) were evaluated by means of hydrogen evolution,mass loss experiments and corrosion mechanism. The effects of rare earth element Y on microstructure and biocorrosion properties of the alloys were analyzed. The results indicate that the majority of the precipitated phase is soluble in matrix after solution treatment and the corrosion rate in SBF is only 44. 35% and 46. 67% compared with the as-cast alloys. What is more,the morphology of precipitated phase change from continuous network to discontinuous disperse after the addition of Y,leaving a new blocky Mg24Y5 phase,which can improve the biocorrosion properties of the alloys.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第1期36-41,共6页
Transactions of Materials and Heat Treatment
基金
河南省"新型有色金属材料"高校科技创新团队支持计划(2012IRTSTHN008)
洛阳市科技攻关项目(1301001A)
关键词
固溶处理
稀土
生物镁合金
生物腐蚀性能
solution treated
rare earths
biodegradable magnesium alloy
biocorrosion properties
