Journal
SURFACE & COATINGS TECHNOLOGY
Volume 339, Issue -, Pages 48-56Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2018.02.009
Keywords
Laser shock peening (ISP); Magnesium alloys; Wear resistance; Fatigue performance; Biodegradation; Biocompatibility
Funding
- College of Engineering at The University of Akron [207135, 207137]
- University of Akron
- Ohio Research Scholar-Biomaterials start-up funds
- US Army Research Office [W911NF1610549]
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Mg alloys offer potential advantages over conventional biomedical implant materials because of their biodegradability and biocompatibility, but could be limited by their poor mechanical properties. In this study, laser shock peening (LSP), a surface processing technique, was applied to improve the mechanical properties of the AZ31B magnesium (Mg) alloy. It was demonstrated that LSP increased the hardness and yield strength of the Mg alloy. Due to the hardening, LSP significantly improved the wear resistance and fatigue performance of the Mg alloy. In addition, immersion tests carried out in cell culture medium revealed that LSP did not significantly increase Mg2+ release and weight loss. Furthermore, an in vitro cell culture study showed that the LSP-treated samples have cell-compatibility comparable to untreated samples. Thus, the LSP technique could, with further study, advance the clinical utility of Mg alloys in the orthopedic field.
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