Abstract The physical and chemical properties of biodegradable zinc alloys are closely related to their microstructures. Therefore, various techniques are being attempted to change their microstructures. However, little work has been done to control the initial solidification structures of the biodegradable zinc alloys, which play an important role in determining their final properties. In view of this, Zn-Ag alloys with different compositions were solidified under a high-voltage pulsed magnetic field (HVPMF) in this work. The results show that the primary η-Zn grains in the isomorphous Zn-2.5 wt% Ag alloy are transformed from coarse dendrites to fine globular grains with increasing the HVPMFs. Also, its macrostructural homogeneity in the specimens is enhanced gradually. Moreover, the primary e-AgZn3 dendrites in the hypoperitectic Zn-4.0 wt% Ag and hyperperitectic Zn-9.0 wt% Ag alloys are refined and “levitated” by the HVPMFs. Correspondingly, the peritectic η-Zn grains that nucleate on the fine primary e-AgZn3 particles are also significantly refined. In addition, when applying the HVPMFs in separate solidification stages of these two alloys, it is found that the HVPMFs mainly have a crucial effect on the structures in the early stage. The modification of the solidification structures in the Zn-Ag alloys is attributed to the forced convection and the Joule heat induced in the liquid-solid two-phase zone by the HVPMFs.

中文翻译：

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高压脉冲磁场对可生物降解锌银合金凝固组织的影响

摘要 可生物降解锌合金的理化性能与其微观结构密切相关。因此，正在尝试各种技术来改变它们的微观结构。然而，很少有工作来控制可生物降解锌合金的初始凝固结构，这在决定其最终性能方面起着重要作用。鉴于此，本文在高压脉冲磁场（HVPMF）下固化了不同成分的 Zn-Ag 合金。结果表明，随着 HVPMF 的增加，同晶 Zn-2.5 wt% Ag 合金中的初生 η-Zn 晶粒从粗大的枝晶转变为细小的球状晶粒。此外，其在试样中的宏观结构均匀性逐渐增强。此外，亚包晶 Zn-4 中的初级 e-AgZn3 枝晶。0 wt% Ag 和超包晶 Zn-9.0 wt% Ag 合金被 HVPMF 精炼和“悬浮”。相应地，在初级 e-AgZn3 细颗粒上成核的包晶 η-Zn 晶粒也得到了显着的细化。此外，当在这两种合金的不同凝固阶段应用 HVPMFs 时，发现 HVPMFs 主要对早期的组织有关键影响。Zn-Ag 合金凝固结构的改变归因于 HVPMF 在液固两相区引起的强制对流和焦耳热。当在这两种合金的不同凝固阶段应用 HVPMFs 时，发现 HVPMFs 主要对早期的组织有关键影响。Zn-Ag 合金凝固结构的改变归因于 HVPMF 在液固两相区中引起的强制对流和焦耳热。当在这两种合金的不同凝固阶段应用 HVPMFs 时，发现 HVPMFs 主要对早期的组织有关键影响。Zn-Ag 合金凝固结构的改变归因于 HVPMF 在液固两相区引起的强制对流和焦耳热。