Enhancement in mechanical and corrosion resistance properties of a biodegradable Zn-Fe alloy through second phase refinement

被引：52

作者：

Shi, Zhang-Zhi ^{[1
]}

Gao, Xi-Xian ^{[1
]}

Chen, Hong-Ting ^{[1
]}

Liu, Xue-Feng ^{[1
]}

Li, Ang ^{[1
]}

Zhang, Hai-Jun ^{[2
]}

Wang, Lu-Ning ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Lab Metall Mat & Proc Modem Transportat, Key Lab Adv Mat Proc,Minist Educ, Beijing 100083, Peoples R China

[2] Tongji Univ, Peoples Hosp Shanghai 10, Dept Intervent & Vasc Surg, Shanghai 200072, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS | 2020年 / 116卷

关键词：

Biodegradable Zn alloys; Second phase refinement; Properties; Casting; CA-ZN; MN; MICROSTRUCTURE; CU; BEHAVIOR; BETA; MG;

D O I：

10.1016/j.msec.2020.111197

中图分类号：

TB3 [工程材料学]; R318.08 [生物材料学];

学科分类号：

0805 ; 080501 ; 080502 ;

摘要：

Biodegradable Zn alloys containing Fe suffer from a common problem that FeZn13 second phase particles are coarse. This problem roots thermodynamically from the negligible solid solubility of Fe in Zn and priority of FeZn13 solidification over Zn. In this paper, bottom circulating water-cooled casting method is successfully developed to significantly refine FeZn13 particles in Zn-0.3Fe alloy, owing to its cooling speed about 8 times of that of conventional casting. The second phase refinement alleviates brittleness of the alloy, increases the ultimate tensile strength by about 62%, and decreases electrochemical corrosion rate (CR) by about 19%, but immersion CR by only about 4% due to barrier effect of corrosion products. Viability of human umbilical vein endothelial cells maintains at a high level over 95% in 25-100% extracts. A great potential is shown for improving comprehensive properties of biodegradable Zn alloys without changing its chemical compositions through such a physical method.

引用

页数：11

共 24 条

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