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High Mechanical Functionalization of Metallic Biomaterials through Thermomechanical Treatments

Authors :
Toshikazu AKAHORI
Mitsuo NIINOMI
Masaaki NAKAI
Harumi TSUTSUMI
Source :
Journal of Biomechanical Science and Engineering, Vol 4, Iss 3, Pp 345-355 (2009)
Publication Year :
2009
Publisher :
The Japan Society of Mechanical Engineers, 2009.

Abstract

Currently, β-type Ti-Nb-Ta-Zr alloys are gaining attention owing to their feasibility for use as biomedical materials. However, the deformation behaviors of these alloys have not yet been clarified. In this study, the Nb content of the Ti-30Nb-10Ta-5Zr (TNTZ) alloy was altered between 1.0 and 3.0 mass% from 30 mass%, and the corresponding changes in the superelasticity and shape-memory characteristics were investigated by tensile loading-unloading tests, X-ray diffraction (XRD) analysis, and microstructural analysis using a transmission electron microscopy (TEM). When the Nb content is less than approximately 29 mass%, the loading-unloading stress-strain curves show two-step gradients and are similar to those of common shape-memory alloys such as Ti-Ni alloys; these gradients result from stress-induced martensitic transformation and its reversion. When the Nb content is approximately 30 mass%, the tensile loading-unloading curves show a nonlinear gradient corresponding to superelastic behavior, which can not be explained by XRD and TEM microstructural analyses on stress-induced martensitic transformation and its reversion in the present state. When the Nb content is approximately 31 mass%, the tensile loading-unloading curves show a single gradient. The elastic deformation is mainly caused by the elastic strain in the lattice. Changes in the chemical content of Nb in TNTZ within a very narrow range are found to alter the superelastic behavior of this alloy.

Details

Language :
English
ISSN :
18809863
Volume :
4
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Journal of Biomechanical Science and Engineering
Publication Type :
Academic Journal
Accession number :
edsdoj.6837fbb3524d4a4bbc34f6119eddb4a5
Document Type :
article
Full Text :
https://doi.org/10.1299/jbse.4.345