The influence of alloying dysprosium (Dy) element on the biodegradable behavior and mechanical property of Mg-6Zn alloys in a simulated body solution (SBF) solution was studied. The results indicate that Dy significantly contributes to grain refinement, and form a distinctive fiber texture in Dy-containing alloys. The presence of Dy promotes the formation of granular DyZn₃ precipitates, which possess a higher electrode potential than the matrix, thus accelerating matrix corrosion. Corrosion results demonstrate that the Dy element is not beneficial to reducing the initial corrosion rate of Mg-6Zn but is conducive to improving the protective effect of product film as the immersion time increases. Dy-containing alloys exhibit higher strength than Mg-6Zn while maintaining good plasticity related to grain boundary and precipitation strength effects. Consequently, the incorporation of 2 wt.% Dy into Mg-6Zn alloys results in a synergistic enhancement of strength, as well as moderate corrosion resistance and fracture elongation.

中文翻译：

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为生物应用定制具有不同 Dy 含量的 Mg-6Zn 合金的腐蚀行为和机械性能


研究了合金化镝 （Dy） 元素对 Mg-6Zn 合金在模拟体溶液 （SBF） 溶液中的可生物降解行为和机械性能的影响。结果表明，Dy对晶粒细化有显著贡献，并在含Dy的合金中形成独特的纤维织构。Dy 的存在促进了颗粒状 DyZn₃ 沉淀物的形成，这些沉淀物具有比基体更高的电极电位，从而加速了基体腐蚀。腐蚀结果表明，Dy元素对降低Mg-6Zn的初始腐蚀速率没有好处，但随着浸泡时间的增加，有利于提高产品膜的保护效果。含 Dy 的合金表现出比 Mg-6Zn 更高的强度，同时保持与晶界和析出强度效应相关的良好塑性。因此，将 2 wt.% Dy 掺入 Mg-6Zn 合金中可协同增强强度，以及适度的耐腐蚀性和断裂伸长率。