Surface integrity and corrosion performance of biomedical magnesium-calcium alloy processed by hybrid dry cutting-finish burnishing

Biodegradable magnesium-calcium (MgCa) alloy is a very attractive orthopedic biomaterial compared to permanent metallic alloys. However, the critical issue is that MgCa alloy corrodes too fast in the human organism. Compared to dry cutting, the synergistic dry cutting-finish burnishing can significa...

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Bibliographic Details
Published in:Journal of the mechanical behavior of biomedical materials 2018-02, Vol.78, p.246-253
Main Authors: Salahshoor, M, Li, C, Liu, Z Y, Fang, X Y, Guo, Y B
Format: Article
Language:English
Subjects:
Alloys - chemistry
Biocompatible Materials - chemistry
Calcium - chemistry
Corrosion
Finite Element Analysis
Magnesium - chemistry
Materials Testing
Surface Properties
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Summary:Biodegradable magnesium-calcium (MgCa) alloy is a very attractive orthopedic biomaterial compared to permanent metallic alloys. However, the critical issue is that MgCa alloy corrodes too fast in the human organism. Compared to dry cutting, the synergistic dry cutting-finish burnishing can significantly improve corrosion performance of MgCa0.8 (wt%) alloy by producing a superior surface integrity including good surface finish, high compressive hook-shaped residual stress profile, extended strain hardening in subsurface, and little change of grain size. A FEA model was developed to understand the plastic deformation of MgCa materials during burnishing process. The measured polarization curves, surface micrographs, and element distributions of the corroded surfaces by burnishing show an increasing and uniform corrosion resistance to simulated body fluid.
ISSN:1751-6161
1878-0180
DOI:10.1016/j.jmbbm.2017.11.026