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The corrosion behaviour of commercial purity titanium processed by high-pressure torsion

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Abstract

Commercial purity (CP) titanium was processed by high-pressure torsion (HPT) under an applied pressure of 6.0 GPa for different numbers of torsional revolutions and then exposed to a 3.5 % NaCl solution for open-circuit potential measurements followed by electrochemical impedance spectroscopy and potentiodynamic polarization tests. The electrochemical results exhibit a complicated relationship between the corrosion resistance and grain refinement. Thus, microhardness measurements reveal an improvement in hardness for CP titanium after processing by HPT but the corrosion resistance is lower in the NaCl solution than for the annealed coarse-grained Ti. It is shown that the corrosion susceptibility of the HPT-processed samples decreases with increasing torsional strain. The effect of grain size and microstructure on the corrosion properties of ultrafine-grained CP Ti is also examined.

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Acknowledgements

The authors thank Dr Shuncai Wang (Electron Microscopy Centre, University of Southampton) for assistance with the TEM analysis.

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Authors and Affiliations

  1. National Centre for Advanced Tribology at Southampton (nCATS), Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK

    Mengyan Nie, Chuan Ting Wang, Minghong Qu & Julian A. Wharton

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

    Chuan Ting Wang, Minghong Qu, Nong Gao & Terence G. Langdon

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

    Chuan Ting Wang & Terence G. Langdon

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  1. Mengyan Nie
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  2. Chuan Ting Wang
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  3. Minghong Qu
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  4. Nong Gao
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Correspondence to Mengyan Nie.

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Nie, M., Wang, C.T., Qu, M. et al. The corrosion behaviour of commercial purity titanium processed by high-pressure torsion. J Mater Sci 49, 2824–2831 (2014). https://doi.org/10.1007/s10853-013-7988-z

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  • DOI: https://doi.org/10.1007/s10853-013-7988-z

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