Effects of a high-voltage pulsed magnetic field on the solidification structures of biodegradable Zn-Ag alloys
Effects of a high-voltage pulsed magnetic field on the solidification structures of biodegradable Zn-Ag alloys
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高压脉冲磁场对可生物降解Zn-Ag合金凝固结构的影响
DOI：
10.1016/j.matchar.2020.110274
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发表时间：
2020-05
影响因子：
4.7
通讯作者：
Jianzhong Cui
中科院分区：
文献类型：
--
作者：
Lei Li;Wenlei Liang;Chunyan Ban;Yusong Suo;Guanchen Lv;Tie Liu;Xiangjie Wang;Hui Zhang;Jianzhong Cui
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，很少有工作已经做了控制的初始凝固结构的可生物降解的锌合金，这起着重要的作用，在决定其最终性能。有鉴于此，本文采用高压脉冲磁场（HVPMF）对不同成分的Zn-Ag合金进行了凝固实验。结果表明，随着HVPMFs的增加，Zn-2.5wt%Ag合金中的初生η-Zn晶粒由粗大的枝晶转变为细小的球状晶粒。试样的宏观组织均匀性也逐渐提高。此外，次包晶Zn-4.0wt%Ag和过包晶Zn-9.0wt%Ag合金中的初生ε-AgZn 3枝晶被HVPMFs细化和“悬浮”。相应地，在细小的初生ε-AgZn 3颗粒上形核的围晶η-Zn晶粒也显著细化。此外，当在这两种合金的单独凝固阶段施加HVPMFs时，发现HVPMFs主要对早期阶段的组织起决定性作用。Zn-Ag合金凝固组织的改变主要是由于HVPMFs在液-固两相区产生的强制对流和焦耳热。
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 ε-AgZn3dendrites 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 ε-AgZn3particles 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.
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