通过第二相细化显著提高医用Zn–Fe合金的强度和腐蚀均匀性

石章智; 李长恒; 李猛; 李相民; 王鲁宁

doi:10.1007/s12613-022-2468-6

Volume 29 Issue 4

Apr. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(4): 796-806

Zhangzhi Shi, Changheng Li, Meng Li, Xiangmin Li, and Luning Wang, Second phase refining induced optimization of Fe alloying in Zn: Significantly enhanced strengthening effect and corrosion uniformity, Int. J. Miner. Metall. Mater., 29(2022), No. 4, pp. 796-806. https://doi.org/10.1007/s12613-022-2468-6

Cite this article as:

Zhangzhi Shi, Changheng Li, Meng Li, Xiangmin Li, and Luning Wang, Second phase refining induced optimization of Fe alloying in Zn: Significantly enhanced strengthening effect and corrosion uniformity, Int. J. Miner. Metall. Mater., 29(2022), No. 4, pp. 796-806. https://doi.org/10.1007/s12613-022-2468-6

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研究论文

通过第二相细化显著提高医用Zn–Fe合金的强度和腐蚀均匀性

北京科技大学材料科学与工程学院北京材料基因工程高精尖创新中心，北京 100083，中国

通讯作者:
石章智 E-mail: ryansterne@163.com

王鲁宁 E-mail: luning.wang@ustb.edu.cn

文章亮点

(1) 用底部循环水冷凝固法显著细化了医用Zn–0.3Fe合金中的FeZn₁₃第二相。

(2) 凝固细化导致该合金的屈服和抗拉强度分别提高了86 MPa和105 MPa。

(3) 第二相细化后该合金在模拟体液中的腐蚀均匀性显著提升。

(4) 发现医用锌合金中合金元素的强化效率随添加量的变化呈现幂函数规律。

(5) 揭示了提高冷速消除长条状FeZn₁₃第二相的机理是提高成分过冷降低了形核能垒。

中文摘要

许多无毒且具有生理功能性的合金化元素，例如Fe、Ca和Sr等，在Zn基体中的固溶度低到可以忽略。在锌合金熔体的凝固过程中，它们往往与Zn形成金属间化合物，在熔体中形核生长，形成粗大的第二相颗粒。这导致这些低固溶度的合金化元素对锌合金的强化效果较弱，且导致合金的塑性显著降低。因此，细化粗大第二相是多种锌合金组织性能优化的共同追求。本文以含有粗大FeZn₁₃第二相的Zn–0.3Fe合金为试金石，探索了底部循环水冷凝固法与多道次轧制结合的显微组织细化方法。研究发现，该方法能将FeZn₁₃第二相颗粒的平均尺寸从24 μm细化至2 μm，将Zn晶粒由长度可超过800 μm的柱状晶组织细化为平均尺寸为5 μm的等轴晶组织。底部循环水冷凝固对FeZn₁₃第二相颗粒的细化效果是总压下量达92%的多道次轧制对FeZn₁₃第二相颗粒的细化效果的2.5倍，这说明在液态成形中进行金属间化合物第二相细化的重要意义。组织细化显著提高了Fe在Zn中的强化效果，轧制后，Zn–0.3Fe合金的屈服和抗拉强度由132 MPa和159 MPa分别提升至218 MPa和264 MPa，且延伸率仍有24%。此外，腐蚀不均匀程度和局部腐蚀坑的穿透深度也显著减小。上述研究结果说明，显微组织细化，特别是粗大金属间第二相颗粒的细化，对提高多种医用锌合金的强度和腐蚀均匀性具有很大潜力。

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Research Article

Second phase refining induced optimization of Fe alloying in Zn: Significantly enhanced strengthening effect and corrosion uniformity

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Abstract

Abstract

Many non-toxic alloying elements, such as Fe, Ca, and Sr, have negligible solid solubilities in Zn matrix, leading to formation of coarse second phase particles. They exhibit low strengthening effects but highly detrimental to ductility. So refining second phase is a common pursuit for Zn alloys. The present paper takes Zn–0.3Fe alloy suffered from coarse FeZn₁₃ second phase particles as a touchstone to testify microstructure refining effect through solidification with an accelerated speed and multi-pass rolling. FeZn₁₃ particles are refined from 24 to 2 μm, and Zn grains are refined to 5 μm. As a result, the strengthening effect of Fe is enhanced significantly, with yield strength and the ultimate tensile strength of the alloy increased from 132 to 218 MPa and from 159 to 264 MPa, respectively. Furthermore, corrosion non-uniformity and penetration are much alleviated. These results show that microstructure refinement, especially on coarse intermetallic second phases, has a great potential to improve mechanical and degradation properties of biodegradable Zn alloys.
- zinc alloys;
- microstructure;
- mechanical properties;
- corrosion uniformity

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