Composition optimization of low modulus and high-strength TiNb-based alloys for biomedical applications

Year: 
2016
Month: 
10
Day: 
20
Pages: 
866-871
DOI: 
10.1016/j.jmbbm.2016.10.013
Author(s): 
Type: 
Journal Articles
Journal: 
Journal of the Mechanical Behavior of Biomedical Materials
Volume: 
65
Abstract: 

The effect of chemical composition on microstructure and tensile properties of a series of low modulus Ti-Nb-Cu-Ni-Al alloys was studied. These alloys consist of primary micrometer-sized β-Ti dendrites surrounded by intermetallic phases. The morphology of the intermetallic phases is strongly affected by composition. Due to the composite microstructure, the alloys exhibit a low Young's modulus (77 – 84 GPa) together with a high yield strength of about 1000 MPa as well as moderate tensile ductility. The results demonstrate that complete substitution of Al by Ti reduces the Young's modulus by 5%. Increasing Nb content at the expense of Ti causes a significant improvement of tensile ductility.