Microstructure of Biodegradable Zn-Fe Alloys and Mechanical and Corrosion Properties
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https://doi.org/10.1007/s11837-020-04317-y Ó 2020 The Minerals, Metals & Materials Society
TECHNICAL ARTICLE
Microstructure of Biodegradable Zn-Fe Alloys and Mechanical and Corrosion Properties JIAJIA LIN,1 YUXIANG WANG,3 DONGWEI SUN,1 HAO XUE,3 REN-GUO GUAN,2,3,5 and HUINAN LIU 1,4,6 1.—Material Science and Engineering Program, University of California, 900 University Avenue, Riverside, CA 92521, USA. 2.—Engineering Research Center of Continuous Extrusion, Ministry of Education, Dalian Jiaotong University, No. 794 Huanghe Road, Shahekou District, Dalian 116028, China. 3.—School of Materials Science and Engineering, Northeastern University, No. 3-11 Wenhua Road, Heping District, Shenyang 110819, China. 4.—Department of Bioengineering, University of California, 900 University Avenue, Riverside, CA 92521, USA. 5.—e-mail: [email protected]. 6.—e-mail: [email protected]
This article reports microstructural characterization of as-cast and as-extruded Zn-Fe alloys and their mechanical and corrosion properties. Specifically, 1 wt.%, 2 wt.% and 3 wt.% Fe was added into the Zn matrix to form respective Zn-Fe alloys using casting and indirect hot extrusion processes. As the Fe content increased within the range of 1–3 wt.%, the mechanical properties of as-cast and as-extruded Zn-Fe alloys improved. The as-extruded ZnFe alloys showed superior mechanical properties of hardness, ultimate tensile strength (UTS) and elongation to failure (EL) to the as-cast Zn-Fe alloys of the same composition. Specifically, the UTS for as-extruded Zn-Fe alloys was 138– 170 MPa, whereas the UTS for as-cast Zn-Fe alloys was 89–125 MPa. The corrosion properties of the as-extruded Zn-Fe alloys were investigated using the electrochemical and immersion methods. The corrosion rate of the asextruded Zn-Fe alloys ranged from 0.015 mm/year to 0.210 mm/year.
INTRODUCTION During the last 2 decades, significant advances have been made in the development of biocompatible and biodegradable materials for medical applications.1,2 Compared with other biomedical materials such as ceramics and polymers, biodegradable metallic materials have attracted significant interests because of their excellent mechanical properties and biodegradability for load-bearing implant applications.3,4 Biodegradable metals (BMs) are expected to gradually corrode and degrade in vivo until they completely fulfill their functions in the body, without generating negative host responses. Biodegradable metallic implants are designed to overcome the disadvantages of permanent metal-based devices, such as physical (Received October 28, 2019; accepted July 28, 2020)
irritations,5 chronic inflammatory responses,6 revision surgeries 7,8 and stress shielding.9 BMs are expected to release biocompatible degradation products and provide better solutions for clinical problems. The BMs can generally be classified into Mgbased BMs (pure Mg, Mg-Ca alloy, Mg-Zn alloy, etc.), Fe-based BMs (pure Fe, Fe-Mn-based alloys, etc.) and Zn-based BMs (pure Zn and its alloys, etc.).10 To date, numerous studies
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