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

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

doi:10.1002/9781118889879.ch27

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

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

Materials Development Division

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

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 language	English
Title of host publication	TMS 2014 - 143rd Annual Meeting and Exhibition, Supplemental Proceedings
Publisher	Minerals, Metals and Materials Society
Pages	205-212
Number of pages	8
ISBN (Print)	9781118889725
DOIs	https://doi.org/10.1002/9781118889879.ch27
Publication status	Published - 2014
Event	143rd Annual Meeting and Exhibition, TMS 2014 - San Diego, CA, United States Duration: 2014 Feb 16 → 2014 Feb 20

Publication series

Name	TMS Annual Meeting

Other

Other	143rd Annual Meeting and Exhibition, TMS 2014
Country	United States
City	San Diego, CA
Period	14/2/16 → 14/2/20

Keywords

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

Access to Document

10.1002/9781118889879.ch27

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Endurance of low-modulus β-type titanium alloys for spinal fixation. / Niinomi, Mitsuo; Nakai, Masaaki; Hieda, Junko; Cho, Ken; Narita, Kengo.

TMS 2014 - 143rd Annual Meeting and Exhibition, Supplemental Proceedings. Minerals, Metals and Materials Society, 2014. p. 205-212 (TMS Annual Meeting).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Niinomi, M, Nakai, M, Hieda, J, Cho, K & Narita, K 2014, Endurance of low-modulus β-type titanium alloys for spinal fixation. in TMS 2014 - 143rd Annual Meeting and Exhibition, Supplemental Proceedings. TMS Annual Meeting, Minerals, Metals and Materials Society, pp. 205-212, 143rd Annual Meeting and Exhibition, TMS 2014, San Diego, CA, United States, 14/2/16. https://doi.org/10.1002/9781118889879.ch27

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abstract = "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.",

keywords = "Biomaterials, Fatigue strength, Low-modulus, Microstructure, Spinal fixation, β-type titanium alloy",

author = "Mitsuo Niinomi and Masaaki Nakai and Junko Hieda and Ken Cho and Kengo Narita",

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N2 - 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.

AB - 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.

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