Unusual effect of oxygen on the mechanical behavior of a β-type titanium alloy developed for biomedical applications

Mitsuo Niinomi, Masaaki Nakai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Oxygen enhances the strength of titanium alloys in general; however, excess oxygen can make titanium alloys brittle. On the other hand, oxygen enhances the precipitation of the a phase and suppresses the formation of the ω phase. Thus, using the optimal amount of oxygen is important to improve the mechanical properties of titanium alloys. The role of oxygen in titanium alloys is still not well understood. The effect of oxygen on the mechanical behavior of a β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (referred to as TNTZ), which is used for biomedical applications, was investigated in this study. Oxygen was found to stabilize the ω phase in TNTZ. This behavior of oxygen is unusual considering the known behavior of oxygen in titanium alloys: oxygen is known to suppress the formation of the ω phase in titanium alloys. A small amount of oxygen increases the tensile strength but decreases the ductility of TNTZ. On the other hand, a large amount of oxygen, of around 0.7 mass%, increases both the tensile strength and the ductility of TNTZ. This phenomenon is unexpected.

Original languageEnglish
Title of host publicationTHERMEC 2011
PublisherTrans Tech Publications Ltd
Pages135-142
Number of pages8
ISBN (Print)9783037853030
DOIs
Publication statusPublished - 2012
Event7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, Canada
Duration: 2011 Aug 12011 Aug 5

Publication series

NameMaterials Science Forum
Volume706-709
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
CountryCanada
CityQuebec City, QC
Period11/8/111/8/5

Keywords

  • Biomedical applications
  • Elongation
  • Oxygen
  • Strength
  • Ti-Nb-Ta-Zr
  • β-type titanium alloy
  • ω phase

ASJC Scopus subject areas

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

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