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Abnormal strain hardening in nanostructured titanium at high strain rates and large strains

  • Nanostructured Materials-Processing, Structures, Properties and Applications
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Abstract

Commercial purity nanostructured titanium prepared by equal channel angular pressing plus cold rolling (grain size ∼260 nm) exhibits a nonnegligible strain hardening behavior at large compressive strains (>15%) and quasistatic loading conditions. The degree of the strain hardening increases with increasing strain rates and becomes more pronounced at dynamic loading rates. This behavior is in contrast with what we have seen so far in other nanostructured materials, where flat stress-strain curves are often seen. It was concluded from transmission electron microscopy investigations that in addition to dislocation slips, deformation twinning may have played a significant role in plastic deformation of nanostructured Ti. The structural failure behavior is in-situ recorded by a CCD camera and reasoned according to the microscopic observations.

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Acknowledgements

YMW thanks Prof. Ma at Johns Hopkins University for his early supports and inspiring discussions. TJ is indebted to Prof. Ramesh for the access of dynamic loading facilities. The work at Lawrence Livermore National Laboratory was performed under the auspices of the U.S. Department of Energy under contract No. W-7405–Eng-48.

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Authors and Affiliations

  1. Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, CA, 94550, USA

    Y. M. Wang & A. V. Hamza

  2. Department of Physics, Boston College, Chestnut Hill, MA, 02467, USA

    J. Y. Huang

  3. Department of Mechanical Engineering, Brown University, Providence, RI, 02912, USA

    T. Jiao

  4. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Y. T. Zhu

Authors
  1. Y. M. Wang
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  2. J. Y. Huang
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  3. T. Jiao
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  4. Y. T. Zhu
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  5. A. V. Hamza
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Correspondence to Y. M. Wang.

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Wang, Y.M., Huang, J.Y., Jiao, T. et al. Abnormal strain hardening in nanostructured titanium at high strain rates and large strains. J Mater Sci 42, 1751–1756 (2007). https://doi.org/10.1007/s10853-006-0822-0

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  • DOI: https://doi.org/10.1007/s10853-006-0822-0

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