Mg-Nd-Zn-Zr (JDBM) alloy was studied as a candidate for biodegradable implant material because of its moderate mechanical properties, good biocompatibility, and favorable uniform degradation behavior. To verify whether JDBM alloy exhibits electroplasticity effect and then study the mechanism of electropulsing treatment on JDBM alloy, in this study, homogenized and pre-tensile deformed samples were treated by electropulsing. After the electropulsing treatment, the average grain size was refined due to recrystallization, micron-scale Mg₁₂Nd secondary phases precipitated slightly, while the morphology of nanoscale Zr particles changed from rodlike to ellipsoidal shape. The elongation to failure (EL) increased obviously for the homogenized and pre-tensile deformed JDBM alloy samples after electropulsing treatment, accompanying with no obvious sacrifice of the yield strength (YS) for the former and an evident decrease of YS for the latter, mainly due to the reduction of the dislocation density. The YS decrement and EL increment (77.57%) for the latter are more apparent attributed to the higher density of dislocations introduced by pre-tensile deformation. Therefore, the electropulsing treatment can obviously improve the mechanical properties of JDBM alloy, especially for the plasticity. The present work opens a new window for the fabrication of JDBM alloy profiles with high mechanical properties, especially for the plasticity, such as the cold drawing wires and tubes for biomedical applications. It also could provide theoretical references for other magnesium alloy processing.

Mg-Nd-Zn-Zr (JDBM) 合金因其适度的机械性能、良好的生物相容性和良好的均匀降解行为而被研究作为可生物降解植入材料的候选材料。为验证JDBM合金是否表现出电塑性效应，进而研究JDBM合金电脉冲处理的机理，本研究对均质化和预拉伸变形样品进行电脉冲处理。电脉冲处理后，平均晶粒尺寸因再结晶而细化，微米级Mg ₁₂Nd二次相析出轻微，而纳米级Zr颗粒的形貌由棒状变为椭圆形。电脉冲处理后均质化和预拉伸变形的JDBM合金样品的破坏伸长率（EL）明显增加，而前者的屈服强度（YS）没有明显的牺牲，而后者的YS则明显降低，主要是由于位错密度的降低。后者的 YS 减少和 EL 增加 (77.57%) 更明显归因于预拉伸变形引入的更高密度的位错。因此，电脉冲处理可以明显提高JDBM合金的力学性能，尤其是塑性。目前的工作为制造具有高机械性能的 JDBM 合金型材打开了新的窗口，特别是在可塑性方面，例如用于生物医学应用的冷拔线材和管材。也可为其他镁合金加工提供理论参考。