Relationships between tensile deformation behavior and microstructure in Ti-Nb-Ta-Zr system alloys

Nobuhito Sakaguchi, Mitsuo Niinomi, Toshikazu Akahori, Junji Takeda, Hiroyuki Toda

Research output: Contribution to journalConference articlepeer-review

121 Citations (Scopus)

Abstract

Ti-Nb-Ta-Zr system alloys are receiving more attention for biomedical material component applications. However, the deformation behavior of the Ti-Nb-Ta-Zr system has not been evaluated to date. Therefore, the deformation behavior of Ti-Nb-Ta-Zr alloys with different Nb contents was investigated in this study. The behaviors of loading-unloading stress-strain curves of Ti-20Nb-10Ta-5Zr and Ti-25Nb-10Ta-5Zr air-cooled after final heating of the manufacturing process are similar to that obtained in metastable β type titanium alloys that have the shape memory effect. Therefore, the shape memory effect was expected in Ti-20Nb-10Ta-5Zr and Ti-25Nb-10Ta-5Zr alloys. The elastic deformation of Ti-30Nb-10Ta-5Zr disobeyed Hooke's law. However, stress or strain-induced martensite (SIM) is not observed on the loading-unloading stress-strain curve. The deformation mechanism of Ti-25Nb-10Ta-5Zr changes with varying its microstructure. In Ti-25Nb-10Ta-5Zr air-cooled after final heating, the microstructure consisted of an ω phase in a β phase. The stress for inducing martensite in a β phase, σM, was nearly equal to the yielding stress, σy. Therefore, stress-induced martensitic transformation and movement of dislocations occurred together. In Ti-25Nb-10Ta-5Zr water-quenched after final heating of the manufacturing process, the microstructure consisted of a single β phase, where σM is lower than σy. Therefore, stress-induced martensitic transformation occurred before yielding.

Original languageEnglish
Pages (from-to)363-369
Number of pages7
JournalMaterials Science and Engineering C
Volume25
Issue number3
DOIs
Publication statusPublished - 2005 May 1
EventSelected Papers Presented at the Materials Science and Technology 2004 Meeting: Titanium for Biomedical, Dental, and Healthcare -
Duration: 2004 Sep 262004 Sep 29

Keywords

  • Biomedical applications
  • Elastic modulus
  • Mechanical properties
  • Shape memory effect
  • Stress-induced martensite
  • Super elastic behavior
  • Ti-Nb-Ta-Zr system titanium alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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