Effect of oxygen content on microstructure and mechanical properties of biomedical Ti-29Nb-13Ta-4.6Zr alloy under solutionized and aged conditions

Masaaki Nakai, Mitsuo Niinomi, Toshikazu Akahori, Harumi Tsutsumi, Michiharu Ogawa

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

The effect of oxygen content on the microstructure and mechanical properties of the Ti-29 mass%Nb-13 mass%Ta-4.6 mass%Zr (TNTZ) alloy was investigated in this study. The microstructural observation of TNTZ alloys, containing 0.1-0.4mass% oxygen, subjected to solution treatment shows the presence of a single β phase. With an increase in oxygen content, the hardness, tensile strength, and Young's modulus of TNTZ alloy increase, but its elongation decreases. Further, the α phase precipitates in TNTZ alloys subjected to aging treatment at 723 K for 259.2 ks. The results of transmission electron microscopy and X-ray diffraction analysis indicate that the size and volume fraction of the α phase increase with oxygen content. Corresponding to the changes in the microstructure, the mechanical properties of TNTZ alloy subjected to aging treatment at 723 K change with oxygen content. The increase in oxygen content leads to enhancement of the age hardening of TNTZ alloy, thereby increasing both tensile strength and Young's modulus of TNTZ alloy, but its elongation decreases due to the α-phase precipitation. The mechanical properties of TNTZ alloy (Young's modulus: around 60-100 GPa, tensile strength: around 600-1400 MPa, and elongation: around 5-23%) vary significantly depending on oxygen content and heat treatment.

Original languageEnglish
Pages (from-to)2716-2720
Number of pages5
JournalMaterials Transactions
Volume50
Issue number12
DOIs
Publication statusPublished - 2009 Dec

Keywords

  • Biomaterial
  • Interstitial element
  • Oxygen
  • Tensile properties
  • Titanium alloy
  • Young's modulus

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Effect of oxygen content on microstructure and mechanical properties of biomedical Ti-29Nb-13Ta-4.6Zr alloy under solutionized and aged conditions'. Together they form a unique fingerprint.

Cite this