Biodegradable Mg–Zn–Ca–Sr bulk metallic glasses with enhanced corrosion performance for biomedical applications. (15th February 2015)

• Record Type: Journal Article
• Authors: Li, Haifei; Pang, Shujie; Liu, Ying; Sun, Lulu; Liaw, Peter K.; Zhang, Tao
• Is Part Of: Materials & design. Volume 67(2015:Mar.)
• Page Start: 9
• Page End: 19
• Publication Date: 2015-02-15
• Subjects: Magnesium alloy -- Biodegradable material -- Bulk metallic glass -- Mechanical property -- Corrosion behavior; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2014.10.085
• Languages: English
• ISSNs: 0264-1275

Abstract

Highlights: Novel biodegradable Mg–Zn–Ca–Sr bulk metallic glasses (BMGs) with superior glass-forming ability (GFA) were developed. Sr-microalloying enhances the GFA and the corrosion resistance of the Mg–Zn–Ca BMG. The Mg–Zn–Ca–Sr BMGs exhibit high specific strength and low Young's modulus. A schematic model illustrating the corrosion mechanisms of the Mg–Zn–Ca–Sr BMGs is proposed. Abstract: Magnesium alloys with the integration of suitable corrosion behavior and good mechanical properties are desired for biodegradable materials. In this paper, novel biodegradable Mg-based bulk metallic glasses (BMGs) were synthesized in the Mg–Zn–Ca–Sr alloy system. Compared with the Mg–Zn–Ca BMG, the Mg–Zn–Ca–Sr BMGs with minor Sr incorporation possess improved glass-forming ability, better mechanical properties, enhanced and adjustable corrosion performance, reduced hydrogen evolution, and comparable cytocompatibility, indicating their promising potential to serve as biodegradable materials. The enhanced corrosion resistance of the Sr-incorporated BMGs is ascribed to the higher amount of the zinc hydroxide/oxide in the alloy surface, and a schematic model is proposed to illustrate the corrosion mechanisms of the Mg–Zn–Ca–Sr BMGs.