Endurance of low-modulus β-type titanium alloys for spinal fixation

Mitsuo Niinomi, Masaaki Nakai, Junko Hieda, Ken Cho, Kengo Narita

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


Newly developed low-modulus β-type titanium alloys such as Ti-29Nb-13Ta-4.6Zr (TNTZ) and Ti-Cr alloys are expected to be used for rods in spinal fixation devices. As the endurance, i.e., fatigue strength, is one of the most important factors for this application. Various types of fatigue strengths of TNTZ and Ti-Cr alloys as well as their developments were investigated. Compared to conventional Ti-6A1-4V extra low interstitials (ELI) for biomedical applications the uni-axial fatigue strength of TNTZ is increased significantly by thermomechanical processing, which includes solution treatment, severe cold swaging or rolling, and followed by aging treatment. The uni-axial fatigue strength of Ti-12Cr is significantly higher compared to that of Ti-6A1-4V ELI. The four point bending fatigue strengths of the alloys exhibit opposite trends.

Original languageEnglish
Title of host publicationTMS 2014 - 143rd Annual Meeting and Exhibition, Supplemental Proceedings
PublisherMinerals, Metals and Materials Society
Number of pages8
ISBN (Print)9781118889725
Publication statusPublished - 2014
Event143rd Annual Meeting and Exhibition, TMS 2014 - San Diego, CA, United States
Duration: 2014 Feb 162014 Feb 20

Publication series

NameTMS Annual Meeting


Other143rd Annual Meeting and Exhibition, TMS 2014
Country/TerritoryUnited States
CitySan Diego, CA


  • Biomaterials
  • Fatigue strength
  • Low-modulus
  • Microstructure
  • Spinal fixation
  • β-type titanium alloy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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