Highly Ductile Zn-2Fe-WC Nanocomposite as Biodegradable Material
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Highly Ductile Zn-2Fe-WC Nanocomposite as Biodegradable Material ZEYI GUAN, CHASE S. LINSLEY, SHUAIHANG PAN, CHRISTINA DEBENEDETTO, JINGKE LIU, BENJAMIN M. WU, and XIAOCHUN LI Zinc (Zn) has been widely investigated as a biodegradable metal for orthopedic implants and vascular stents due to its ideal corrosion in vivo and biocompatibility. However, pure Zn lacks adequate mechanical properties for load-bearing applications. Alloying elements, such as iron (Fe), have been shown to improve the strength significantly, but at the cost of compromised ductility and corrosion rate. In this study, tungsten carbide (WC) nanoparticles were incorporated into the Zn-2Fe alloy system for strengthening, microstructure modification, and ductility enhancement. Thermally stable WC nanoparticles modified the intermetallic f-FeZn13 interface morphology from faceted to non-faceted. Consequently, WC nanoparticles simultaneously enhance mechanical strength and ductility while maintaining a reasonable corrosion rate. Overall, this novel Zn-Fe-WC nanocomposite could be used as biodegradable material for biomedical applications where pure Zn is inadequate. https://doi.org/10.1007/s11661-020-05878-y Ó The Minerals, Metals & Materials Society and ASM International 2020
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INTRODUCTION
ZN and its alloys have been proposed and intensively studied in the last decade as an innovative candidate for degradable biomedical implants, especially as bioresorbable cardiovascular stents. Compared with magnesium and its alloys, which have been comprehensively studied as biodegradable materials for more than 20 years,[1] Zn alloys offer excellent biocompatibility in addition to a tolerable bio-corrosion rate.[2] The relatively slow degradation process of Zn causes no aggressive hydrogen bubble evolution when comparing to
ZEYI GUAN, SHUAIHANG PAN and JINGKE LIU are with the Department of Mechanical & Aerospace Engineering, Samueli School of Engineering, University of California, Los Angeles, Los Angeles, CA. CHASE S. LINSLEY and CHRISTINA DEBENEDETTO are with the Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, Los Angeles, CA. BENJAMIN M. WU is with the Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles and with the Department of Materials Science & Engineering, Samueli School of Engineering, University of California, Los Angeles, Los Angeles, CA and with the Division of Advanced Prosthodontics, School of Dentistry, University of California, Los Angeles, Los Angeles, CA and also with the Department of Orthopedic Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA. XIAOCHUN LI is with the Department of Mechanical & Aerospace Engineering, Samueli School of Engineering, University of California, Los Angeles and also with the Department of Materials Science & Engineering, Samueli School of Engineering, University of California, Los Angeles. Contact e-mail: [email protected] Manuscript submitted December 3, 2019.
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