Journal of Materials Science

, Volume 49, Issue 19, pp 6558–6564 | Cite as

Microstructural evolution in ultrafine-grained titanium processed by high-pressure torsion under different pressures

  • Chuan Ting Wang
  • Alan G. Fox
  • Terence G. Langdon
Ultrafinegrained Materials


A grade 2 commercially pure (CP) titanium was processed by high-pressure torsion (HPT) at pressures of 3.0 and 6.0 GPa in order to achieve improved strengths. The microhardness values for these Ti samples were plotted against the imposed strain, and the plots show that a higher saturation microhardness of 320 Hv is achieved for the sample processed at 6.0 GPa compared to a microhardness of 305 Hv when using a pressure of 3.0 GPa. The omega ω-phase has been reported in some earlier HPT investigations of pure titanium, but it was not detected in this investigation even after processing at 6.0 GPa. The absence of the ω-phase is attributed to the relatively high level of oxygen (0.25 wt%) in these CP titanium samples. The higher saturation hardness for the 6.0 GPa sample is consistent with the smaller average grain size of ~105 ± 12 nm compared with the measured grain size of ~130 ± 18 nm after processing with an imposed pressure of 3.0 GPa.


Shear Strain Severe Plastic Deformation Commercial Purity Severe Plastic Deformation Processing Commercial Purity Titanium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work was supported in part by the National Science Foundation of the United States under Grant No. DMR-1160966 and in part by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Chuan Ting Wang
    • 1
  • Alan G. Fox
    • 2
  • Terence G. Langdon
    • 1
    • 3
  1. 1.Departments of Aerospace & Mechanical Engineering and Materials ScienceUniversity of Southern CaliforniaLos AngelesUSA
  2. 2.Mechanical Engineering DepartmentAsian UniversityChon BuriThailand
  3. 3.Materials Research Group, Faculty of Engineering and the EnvironmentUniversity of SouthamptonSouthamptonUK

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