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Composition optimization of low modulus and high-strength TiNb-based alloys for biomedical applications
I V Okulov1, A S Volegov2, H Attar3
1IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany; TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany; Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany.
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 (77-84GPa) together with a high yield strength of about 1000MPa 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.
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