Paul S Nnamchi, C S Obayi and B A Okorie
University of Nigeria, Nigeria
Posters & Accepted Abstracts: J Bioengineer & Biomedical Sci
Titanium alloys consisting of nontoxic elements, such as Nb, Mo, Ta, and Zr has become the material of choice for orthopedic implants, due to their corrosion resistance, biocompatibility, high strength and wear resistance. However, stress shielding which deteriorates the quality of most metallic implants by inducing re-sorption processes is still a major drawback to its use. Several researchers in this field have traced the origin of this phenomenon to composition, and processing induced structural effects on properties of materials. The development and application of predictive modeling and simulation are transforming the discovery process. To this end, ab initio theoretical calculation was used to evaluate the chemical and crystallographic identities of the composite phases, their volume fractions/distributions, in addition to their influence on the elastic Youngâ��s modulus of new Ti-Mo-Nb-Zr alloys. To compare theoretical data with experiment, a series of the designed alloys were prepared and characterized. This led to the fabrication of new metastable �²-type Ti-6Mo-Nb-Zr (at. %) alloys with ultralow Youngâ��s modulus (30.25GPa to 48GPa, versus ~30GPa for human bone) by alloying and thermomechanical treatments (i.e., heat treatment and swaging). The agreement between the predictions and experimental data sheds light on the decisive influence of multiphase composites on properties of polycrystals. The study indicates that this approach can be highly beneficial as it may lead to something outlandish with respect to reducing the Youngâ��s modulus of metallic biomaterials, which is pertinent to preventing stress shielding and bone resorption in orthopedic implants.
Email: paul.nnamchi@unn.edu.ng
Journal of Bioengineering & Biomedical Science received 307 citations as per Google Scholar report
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