A study of structure formation in Ti-Nb-Zr shape memory alloys for medical application

Abstract

Abstract.A study of structure formation in Ti-Nb-Zr shape memory alloys was carried out by means of transmission electron microscopy. After 450 о С annealing of cold-worked specimens a very high dislocation density (10 11 сm -2 ) remained; after 600 о С annealing a mixed structure consisting of submicron sized grains and subgrains formed. Therefore, a nanosubgrained structure is expected to form after 500 -550 о С annealing.

Comparative study of structure formation and mechanical behavior of age-hardened Ti–Nb–Zr and Ti–Nb–Ta shape memory alloys

“…They contain exclusively biocompatible components, thus providing high corrosion resistance and biochemical compatibility [1][2][3][4][5], whereas their superelastic behavior and low Young's modulus are close to those of bone tissues [6][7][8][9]. The structure and functional properties of these alloys depend on a complex sequence of phase transformations, including reversible β ↔ α″ and β ↔ ω transformations, and can effectively be controlled by a technological sequence comprising plastic deformation, post-deformation annealing (PDA) and age-hardening heat treatments [7,[10][11][12].…”

Electrochemical behavior of new experimental TiNbZrAl alloys for dental applications

“…Although titanium‐based materials are ones among the most corrosion‐resistant materials in human body fluids, over time the concern related to corrosion phenomenon is still actual . In order to avoid stress shielding effect the low modulus Ti alloys were recently developed for structural biomedical applications . Among these alloys there are ones from TiNbZrAl alloy system , which remark through superelastic properties for certain chemical compositions.…”

Nanoparticles from Cu-Zn-Al shape memory alloys physically synthesized by ion milling deposition

“…It has been reported that the transformation takes place in bulk materials after a severe deformation and different heat treatments when the grain size of the alloy is around 40 nm [9][10][11][12][13] . The development of SMA with controlled grain size is interesting for applications.…”