Microstructural change of beta type titanium alloy by intense plastic deformation

Goroh Itoh, Hisashi Hasegawa, Tsing Zhou, Yoshinobu Motohashi, Mitsuo Niinomi

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

2 Citations (Scopus)


Usual static recrystallization treatment and a method to provide intense plastic deformation, ARB namely Accumulative Roll-Bonding, have been applied to two beta type titanium alloys, i.e. Ti-29Nb-13Ta-4.6Zr and Ti-15V-3Cr-3Sn-3Al. Microstractural change as well as work-hardening behavior was examined as a function of plastic strain. Both the work-hardening rate and the hardness at the initial as-hot-rolled state were smaller in the Ti-Nb-Ta-Zr alloy than in the Ti-V-Cr-Sn-Al alloy. Recrystallized grains of 14μm in size were obtained by the usual static recrystallization treatment, which was significantly smaller than that of the starting as-hot-rolled plate of 38μm. No significant change other than flattening and elongating of the original grains was found in the optical microscopic scale. It was revealed, however, from a TEM observation combined with selected area diffraction technique that geometric dynamic recrystallization occurred in the Ti-Nb-Ta-Zr alloy deformed at room temperature by a true strain of 5, resulting in an ultra-fine-grained microstracture where the grain size was roughly estimated to be about 100nm.

Original languageEnglish
Title of host publicationNanomaterials by Severe Plastic Deformation, NanoSPD3 - Proceedings of the 3rd International Conference on Nanomaterials by Severe Plastics Deformation
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)0878499857, 9780878499854
Publication statusPublished - 2006
Externally publishedYes
Event3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3 - Fukuoka, Japan
Duration: 2005 Sept 222005 Sept 26

Publication series

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


Other3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3


  • Accumulative roll-bonding
  • Beta type titanium alloy
  • Grain size
  • Intense plastic deformation
  • Microstructure
  • Recrystallization
  • Ti-15V-3Cr-3Sn-3AI
  • Ti-29Nb-13Ta-4.6Zr
  • Work hardening

ASJC Scopus subject areas

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


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