Mechanical and microstructural characterization of new nickel-free low modulus beta-type titanium wires during thermomechanical treatments
Author
Herranz Díez, Carolina
Shaffer, J.E.
Gil Mur, Francisco Javier
Publication date
2015ISSN
0921-5093
Abstract
NiTi alloy is the only practical shape memory alloy (SMA) in biomedical use because of its excellent mechanical stability and functionality. However, it is estimated that between 4.5% and 28.5% of the population are hypersensitive to nickel metal, with a higher prevalence in females. Therefore, developing nickel-free low modulus β-type titanium alloys showing shape memory or super elastic behavior would have a great interest in the biomaterials field. Homogeneous 127 μm diameter Ti25Hf21Nb wires were produced and compared to straight annealed Ti–50.8 at% Ni (Nitinol) and 90% cold-drawn 316L wires. Microstructural changes taking place during the heat treatment of cold-worked Ti25Hf21Nb wires were investigated. Large plastic deformation during wire drawing and subsequent annealing led to nano-crystallization and amorphization which may contribute to the observed superelasticity. Mechanical properties were characterized using cyclic uniaxial tension and rotary beam fatigue test modes. A modulus of elasticity of less than 60 GPa and axial recoverable strain of greater than 3% were observed with stress hysteresis resembling a reversible stress-induced martensitic transformation at higher temperatures. The new Ti25Hf21Nb alloy is an important candidate for developing Ni-free SMAs in the future.
Document Type
Article
Document version
Accepted version
Language
English
Subject (CDU)
616.3 - Pathology of the digestive system. Complaints of the alimentary canal
Keywords
Aliatges de titani sense níquel
Pseudoelasticitat
Filferros de mòdul elàstic baix
Gran deformació plàstica
Aleaciones de titanio sin níquel
Pseudoelasticity
Alambre de módulo elástico bajo
Gran deformación plástica
Nickel-free titanium alloys
Pseudoelasticity
Low elastic modulus wires
Great plastic deformation
Pages
33
Publisher
Elsevier
Collection
636;
Is part of
Materials science and engineering A
Citation
Guillem Martí, Jordi; Herranz-Diez, Carolina; Shaffer, J.E. [et al.]. Mechanical and microstructural characterization of new nickel-free low modulus β-type titanium wires during thermomechanical treatments. Materials Science and Engineering: A, 2015, 636, p. 507-515. Disponible en: <https://www.sciencedirect.com/science/article/abs/pii/S0921509315003020?via%3Dihub>. Fecha de acceso: 15 nov. 2021. DOI: 10.1016/j.msea.2015.03.060
This item appears in the following Collection(s)
- Odontologia [239]
Rights
© 2015 Elsevier B.V. All rights reserved.