Influence of phase transformations on dynamical elastic modulus and anelasticity of beta Ti-Nb-Fe alloys for biomedical applications

Journal of the Mechanical Behavior of Biomedical Materials
J M ChavesC R M Afonso

Abstract

Recent studies in materials for biomedical applications have focused on β-titanium alloys that are highly biocompatible, free of toxic elements and with an elastic modulus close to that of human bone (10-40 GPa). Beta Ti-xNb-3Fe (x=10, 15, 20 and 25 wt%) alloys were obtained by rapid solidification and characterized by anelastic relaxation measurements at temperatures between 140 K and 770 K, using a free-decay elastometer, as well as analysis by Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The observed stabilization of the β-phase with rising Nb content was linked to the strength of the relaxation peak around 570 K. The phase transformations detected in the anelastic relaxation spectra agreed with those observed in the DSC curves. However, the results from anelastic relaxation spectra provide more detailed information about the kinetics of phase transformations. At temperatures between 140 K and 300 K, there was an indication of a reversible transformation in the alloys studied. The elastic modulus measurements showed a hardening of the material, between 400 K and 620 K, related to the ω-phase precipitation. However, the star...Continue Reading

References

Apr 13, 2002·Biomaterials·D J LinC P Ju
Apr 23, 2002·Journal of Oral Rehabilitation·C M LeeJ H Chern Lin
Jan 1, 2008·Journal of the Mechanical Behavior of Biomedical Materials·Mitsuo Niinomi
Jul 19, 2011·International Journal of Biomaterials·M Niinomi, M Nakai
Mar 20, 2013·Journal of the Mechanical Behavior of Biomedical Materials·Mohamed Abdel-Hady Gepreel, Mitsuo Niinomi

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Citations

Dec 27, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Shima Ehtemam-HaghighiLai-Chang Zhang
Oct 22, 2016·Journal of the Mechanical Behavior of Biomedical Materials·Camilo A F SalvadorRubens Caram
Oct 21, 2017·Scientific Reports·Conrado R M AfonsoVicente Amigó

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