Abstract
Effect of Ta content on mechanical properties of Ti-30Nb-XTa-5Zr alloys and effect of Zr content on mechanical properties of Ti-30Nb-10Ta-XZr alloys were investigated. Ti-30Nb-10Ta-5Zr, which is the simplified compositional alloy of Ti-29Nb-13Ta-4.6Zr developed for biomedical applications, has been selected as the basic alloy composition. Tensile tests and elastic modulus measurements and microstructural observations were carried out on those alloys.Microstructures of Ti-30Nb-XTa-5Zr alloys containing Ta less than 10 mass% show the mixture of β and ω phases. Microstructures of Ti-30Nb-XTa-5Zr alloys containing 10 mass%Ta or greater than 10 mass%Ta show single β phase.The tensile strength and elongation of Ti-30Nb-XTa-5Zr alloy show a great change with changing Ta content. The threshold of Ta content for the changing exists between 5 mass% and 10 mass%Ta. The tensile properties of Ti-30Nb-10Ta-XZr alloys are affected by the change of deformation mechanism of β phase.The tensile strength of Ti-30Nb-10Ta-XZr alloys increases with increasing Zr content. The elongation of these alloys decreases with increasing Zr content. The tendency of tensile properties of Ti-30Nb-10Ta-XZr alloys is also caused by the change in deformation mechanism of β phase.From the point of view of stress-strain curves obtained by tensile tests and variation of elastic modulus with changing Zr content, Zr found to act as β stabilizer in Ti-Nb-Ta-Zr system alloy.Ti-30Nb-5Ta-5Zr, Ti-30Nb-10Ta and Ti-30Nb-10Ta-3Zr have relatively lower elastic moduli and greater elongation. Thus, these three Ti-Nb-Ta-Zr system alloys have potential to be used for biomedical applications.
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