采用扫描电镜(SEM)、X射线衍射(XRD)、透射电镜(TEM)研究稀土Y对Mg-2Nd-0.5Zn-0.4Zr生物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Mg-2Nd-0.5Zn-0.4Zr镁合金在模拟体液(SBF)中的生物腐蚀性能。结果表明：稀土Y的添加使得镁合金中析出相由连续分布变为断续状，分布趋于均匀，出现新的片状析出相Mg24Y5。稀土Y能使镁合金的耐生物腐蚀性能得到提高。添加1%的Y时，镁合金腐蚀速度最低为1.051 mm/a，仅为基础合金的40.81%。
Effects of rare earth Y on microstructure of Mg-2Nd-0.5Zn-0.4Zr magnesium alloys were investigated by scanning electronic microscopy (SEM), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The biocorrosion properties of the Mg alloys in the simulated body fluid (SBF) were evaluated by hydrogen evolution, mass loss experiments and electrochemical methods. The results show that the morphology of the precipitated phase changes from continuous network to discontinuous disperse, and grain size is refined after the addition of Y, a new blocky Mg24Y5 phase forms. Y addition improves the biocorrosion properties of the alloys. When the Y addition is 1%, the corrosive speed of the alloy is the lowest, which is 1.051 mm/a, only 40.81%of that of the initial alloy.
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