Microstructure and mechanical behavior of superelastic Ti–24Nb–0.5O and Ti–24Nb–0.5N biomedical alloys

Abstract

To cite this version:A. Ramarolahy, Philippe Castany, F. Prima, P. Laheurte, Isabelle Péron, et al.. Microstructure and mechanical behavior of superelastic Ti-24Nb-0.5O and Ti-24Nb-0.5N biomedical alloys.Journal AbstractIn this study, the microstructure and the mechanical properties of two new biocompatible superelastic alloys, Ti-24Nb-0.5O and Ti-24Nb-0.5N (at.%), were investigated. Special attention was focused on the role of O and N addition on α ″ formation, supereleastic recovery and mechanical strength by comparison with the Ti-24Nb and Ti-26Nb (at.%) alloy compositions taken as references. Microstructures were characterized by optical microscopy, X-ray diffraction and transmission electron microscopy before and after deformation. The mechanical properties and the superelastic behavior were evaluated by conventional and cyclic tensile tests. High tensile strength, low Young's modulus, rather high superelastic recovery and excellent ductility were observed for both superelastic Ti-24Nb-0.5O and Ti24Nb-0.5N alloys. Deformation twinning was shown to accommodate the plastic deformation in these alloys and only the {332} 113 twinning system was observed to be activated by electron backscattered diffraction analyses.

Design of a novel superelastic Ti-23Hf-3Mo-4Sn biomedical alloy combining low modulus, high strength and large recovery strain

“…This value of recovery strain revealed in our newly developed Ti-23Hf-3Mo-4Sn alloy is larger than that commonly observed values in binary solution treated Ti-Nb alloys [5,7,10]. Mechanical characteristics listed in Table. 1 also show that the specimen heat treated at 1073 K and 1173 K exhibited a σ CSS of about 620 and 640 MPa, respectively.…”

“…In addition, for the sake of comparison, the mechanical characteristics of commercially pure CP-Ti (grade 2), Ti-6Al-4V (grade 5 ELI) and binary Ti-Nb alloys [7,10] are also presented in Table. 1. In the present study, the critical stress for slip, σ CSS , is defined as the stress at which 0.5% of plastic deformation, ε p , is induced during the cycling tensile test.…”

“…Over the years, due to distinct compositional modifications and/or targeted alloy design, several new kinds of metastable β Ti-based alloys with superior superelastic properties have been introduced. For example, metastable β Ti-Nb and Ti-Zr based alloys have been found to exhibit large superelastic recovery strain at room temperature through reversible stress-induced martensitic transformation between parent β phase (body centered cubic structure) and martensite " phase (orthorhombic structure) [5,6,[9][10][11][12][13][14][15].…”

Texture investigation of the superelastic Ti–24Nb–4Zr–8Sn alloy

“…In previous works, different kinds of thermo-mechanical treatments were used for the processing of the alloy (cold deformation, hot rolling and warm rolling) [1][2][3][4][5][6]. Thanks to these investigations, a superelasticity of about 3.3% was obtained [3][4][5][6], which is much higher than the values usually obtained with binary Ti-Nb alloys [7][8][9]. Moreover, " flash treatments "…”

Interaction of bone–dental implant with new ultra low modulus alloy using a numerical approach

“…Depending on the type of thermomechanical treatment they have undergone, TiNb alloys, with a composition ranging from Ti-23Nb to Ti-26Nb, can have varying Young's modulus. Recently, we have demonstrated that severe cold rolling deformation followed by flash aging treatment on TiNb and TiNbZr, in order to produce ultra fine grains and/or omega phase, is more effective to improve strength [26][27][28][29][30]. High ultimate tensile strength (800 MPa), and low modulus (30 GPa) are obtained by nanostructuration process, as illustrated in Fig.…”