Nanostructure and fatigue behavior of β-type titanium alloy subjected to high-pressure torsion after aging treatment

Hakan Yilmazer, Mitsuo Niinomi, K. Cho, M. Nakai, J. Hieda, Y. Todaka

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

2 Citations (Scopus)


A novel β-type, Ti-29Nb-13Ta-4.6Zr, referred to as TNTZ has been developed for biomedical applications. Its fatigue strength is one of the most important mechanical biocompatibilities of TNTZ because, in surgical applications, it will be used under cyclic loading conditions. The effect of the microstructural refinement by high-pressure torsion (HPT) on the fatigue behaviour of TNTZ is systematically investigated in this study. TNTZ subjected to HPT processing where the rotation number (N) is 20 (TNTZAHPT) after aging treatment (AT) shows a unique microstructure having ultrafine elongated grains (285 nm in length and 36 nm in width) with high-density dislocations, a large fraction of blurred and wavy boundaries consisting of nonuniform subgrains with high misorientation and nanostructured precipitated α phase. Remarkably, a good combination of high mechanical strength (1375 MPa) and low Young's modulus (87 GPa), compared to that of Ti-6Al-4V (Ti64) ELI, is achieved for TNTZAHPT at N = 20. TNTZAHPT a great fatigue strength, which is comparable to those of (Ti64) ELI.

Original languageEnglish
Title of host publication11th International Fatigue Congress
PublisherTrans Tech Publications
Number of pages6
ISBN (Print)9783038350088
Publication statusPublished - 2014
Event11th International Fatigue Congress, FATIGUE 2014 - Melbourne, VIC, Australia
Duration: 2014 Mar 22014 Mar 7

Publication series

NameAdvanced Materials Research
ISSN (Print)1022-6680


Other11th International Fatigue Congress, FATIGUE 2014
CityMelbourne, VIC


  • Aging treatment
  • Fatigue behavior
  • High-pressure torsion
  • Metallic biomaterials
  • Metastable β-type titanium alloy
  • Microstructural refinement

ASJC Scopus subject areas

  • Engineering(all)


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