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Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants

Paper ID Volume ID Publish Year Pages File Format Full-Text
317 25 2015 10 PDF Available
Title
Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants
Abstract

Iron-based biodegradable metals have been shown to present high potential in cardiac, vascular, orthopaedic and dental in adults, as well as paediatric, applications. These require suitable mechanical properties, adequate biocompatibility while guaranteeing a low toxicity of degradation products. For example, in cardiac applications, stents need to be made by homogeneous and isotropic materials in order to prevent sudden failures which would impair the deployment site. Besides, the presence of precipitates and pores, chemical inhomogeneity or other anisotropic microstructural defects may trigger stress concentration phenomena responsible for the early collapse of the device. Metal manufacturing processes play a fundamental role towards the final microstructure and mechanical properties of the materials. The present work assesses the effect of mode of rolling on the micro-texture evolution, mechanical properties and biodegradation behaviour of polycrystalline pure iron. Results indicated that cross-rolled samples recrystallized with lower rates than the straight-rolled ones due to a reduction in dislocation density content and an increase in intensity of {1 0 0} crystallographic plane which stores less energy of deformation responsible for primary recrystallization. The degradation resulted to be more uniform for cross-rolled samples, while the corrosion rates of cross-rolled and straight-rolled samples did not show relevant differences in simulated body solution. Finally, this work shows that an adequate compromise between biodegradation rate, strength and ductility could be achieved by modulating the deformation mode during cold rolling.

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Keywords
Biodegradable metals; Pure iron; In vitro degradation; Structure–properties relationships; EBSD
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Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 17, 15 April 2015, Pages 68–77
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us