Effects of Nb and O contents on microstructures and mechanical functionalities of biomedical Ti-Nb-Ta-Zr-O system alloys

Toshikazu Akahori, Mitsuo Niinomi, Masaaki Nakai, Tomoyuki Ono, Harumi Tsutsumi

Research output: Contribution to journalArticlepeer-review


Synopsis : Ti-30Nb-10Ta-5Zr-0.3O (TNTZO) alloy, which is simplified chemical composition similar to that of biomedical Ti-29Nb-13Ta-4.6Zr alloy, and the same system alloys of TNTZO with different oxygen (O) and niobium (Nb) contents such as Ti-30Nb-10Ta-5Zr-0.5O, Ti-30Nb-10Ta-5Zr-0.6O alloys, and Ti-27Nb-10Ta-5Zr-0.3O, Ti-28Nb-10Ta-5Zr-0.3O and Ti-29Nb-10Ta-5Zr-0.3O alloys are fabricated by powder metallurgy processing, in which it undergoes severe deformation during swaging. Changes in the deformation behaviors of these alloys caused by small changes in the O and Nb contents are investigated in this study. The stress-strain curve of TNTZO changes nonlinearly with the strain and is characterized by a small stress hysteresis, indicating that TNTZO shows a nonlinear recovery behavior during unloading. This deformation in the alloy is a result of a typical elastic deformation as well as stress-induced martensitic transformation. However, with an increase in the O content, as in the case of alloys with 0.5O and 0.6O, the stress-strain curves change almost linearly with the strain and exhibit a linear recovery behavior during unloading without stress hysteresis. In such alloys, deformation is mainly caused by the typical elastic deformation. On the other hand, with a decrease in the Nb content, the stress-strain curves show two steps with an increase in the strain, and deformation is accompanied by stress hysteresis during both loading and unloading. This deformation is mainly caused by stress-induced martensitic transformation and reverse transformation.

Original languageEnglish
Pages (from-to)93-100
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number2
Publication statusPublished - 2010


  • Elastic deformation
  • Mechanical properties
  • Young's modulus
  • β-type titanium alloy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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