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The effect of microstructural modification on the degradation behavior and mechanical properties of Mg-5wt%Ca alloy was investigated to tailor the load bearing orthopedic biodegradable implant material. The eutectic Mg/Mg2Ca phase precipitated in the as-cast Mg-5wt%Ca alloy generated a well-connected network of Mg2Ca, which caused drastic corrosion due to a micro galvanic cell formed by its low corrosion potential. Breaking the network structure using an extrusion process remarkably retarded the degradation rate of the extruded Mg-5wt%Ca alloy, which demonstrates that the biocompatibility and mechanical properties of Mg alloys can be enhanced through modification of their microstructure. The results from the in vitro and in vivo study suggest that the tailored microstructure by extrusion impede the deterioration in strength that arises due to the dynamic degradation behavior in body solution.

Original publication

DOI

10.1016/j.jmbbm.2012.12.007

Type

Journal article

Journal

Journal of the mechanical behavior of biomedical materials

Publication Date

04/2013

Volume

20

Pages

54 - 60

Addresses

Center for Biomaterials, Korea Institute of Science & Technology, Seoul 136-650, South Korea.

Keywords

Animals, Rats, Rats, Sprague-Dawley, Calcium, Magnesium, Biocompatible Materials, Equipment Design, Equipment Failure Analysis, Materials Testing, Absorbable Implants, Compressive Strength, Tensile Strength, Male, Elastic Modulus