Tailoring Properties of Fe-based Biodegradable Stent Materials by Grain Refinement: A Review

Authors

  • Camillus S. Obayi* Department of Metallurgical and Materials Engineering, University of Nigeria Nsukka, 410001 Nsukka, Nigeria
  • Paul S. Nnamchi Department of Metallurgical and Materials Engineering, University of Nigeria Nsukka, 410001 Nsukka, Nigeria
  • Peter O. Offor Department of Metallurgical and Materials Engineering, University of Nigeria Nsukka, 410001 Nsukka, Nigeria
  • Sabina N. Ude Department of Metallurgical and Materials Engineering, University of Nigeria Nsukka, 410001 Nsukka, Nigeria

DOI:

https://doi.org/10.20221/jnmsr.v2i1.13

Keywords:

grain refinement, degradation rate, biodegradable metal, pure iron

Abstract

Overtime, researchers on biodegradable stent materials are challenged to develop a material having adequate mechanical properties and degradation rate matching tissue healing rate. This study attempted to show that biodegradation rate of pure iron (Fe)-stent material in physiological fluid depends on effective grain size just like its mechanical properties by reviewing some pertinent works on pure Fe-based biometals. This study reviewed the works of some researchers who used different processing methods that altered the microstructure and extracted information on the dependence of degradation rates and mechanical properties of pure iron on average grain sizes. The major outcome of this survey is that finer grain size led to lower degradation rate of pure iron in near-neutral simulated body fluid, while strength increased with decrease in grain size. Strength and ductility are mutually exclusive as extreme grain refinement of Fe-based metal improves strength at the expense of ductility, but enhances corrosion resistance and biocompatibility. On the other hand, extreme grain refinement followed by annealing heat treatment increases grain size, lowers strength and restores ductility. This survey indicates strongly that grain refinement is a promising route of striking a balance among the required properties of iron-based stent material.

Author Biography

Camillus S. Obayi*, Department of Metallurgical and Materials Engineering, University of Nigeria Nsukka, 410001 Nsukka, Nigeria

 

*Corresponding Author
camillus.obayi@unn.edu.ng

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Published

2023-05-29

How to Cite

Obayi*, C. S., Nnamchi, P. S., Offor, P. O., & Ude, S. N. (2023). Tailoring Properties of Fe-based Biodegradable Stent Materials by Grain Refinement: A Review. Journal of Nano and Materials Science Research, 2(1), 97–103. https://doi.org/10.20221/jnmsr.v2i1.13

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