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

  • Ultrafinegrained Materials
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Abstract

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.

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Acknowledgements

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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Authors and Affiliations

  1. Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089-1453, USA

    Chuan Ting Wang & Terence G. Langdon

  2. Mechanical Engineering Department, Asian University, 89 Moo 12, Highway 331, Banglamung, Chon Buri, 20260, Thailand

    Alan G. Fox

  3. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK

    Terence G. Langdon

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  1. Chuan Ting Wang
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Correspondence to Chuan Ting Wang.

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Wang, C.T., Fox, A.G. & Langdon, T.G. Microstructural evolution in ultrafine-grained titanium processed by high-pressure torsion under different pressures. J Mater Sci 49, 6558–6564 (2014). https://doi.org/10.1007/s10853-014-8248-6

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  • DOI: https://doi.org/10.1007/s10853-014-8248-6

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