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Curved nanotwinned structure in Ni induced by dynamic compression

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Abstract

Nanotwinned metals exhibit many interesting deformation behavior when compared to nanocrystalline materials with similar characteristic length scale. In this study, the deformation behavior of a nanotwinned Ni produced with a Ni-carbonyl chemical vapor deposition process was investigated via split Hopkinson pressure bar compression testing for strain rates ranging from 200 to 4100 s−1. This report will focus on the observation and analysis of an interesting microstructure formed as a result of the dynamic deformation; the collective curvature of the twin boundaries that makes up the nanotwinned structure. Furthermore, the curved twin boundaries tend to remain parallel to each other despite the introduction of curve. It is proposed that the formation of such a microstructure via dynamic deformation is likely a result of dislocation interactions with the twin boundaries forming steps made up of incoherent twin boundaries. A curvature can be formed with a large number of these steps formed on any single twin boundaries. The activation of this unique mechanism is dependent on the high strain rates, whereas the extent of operation is dependent on the extent of plastic deformation.

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Acknowledgements

The Authors would like to acknowledge the assistance of Mr. Sheng Huang of the Civil Engineering Department at the University of Toronto throughout this study. The financial support from NSERC of Canada (the Natural Science and Engineering Research Council of Canada) is highly appreciated.

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Author notes

  1. Lin Wang

    Present address: School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China

  2. Charles C. F. Kwan

    Present address: Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada

Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Toronto, 185 College Street, Toronto, ON, M5S 3E4, Canada

    Charles C. F. Kwan, Lin Wang & Zhirui Wang

  2. Department of Civil Engineering, University of Toronto, 35 St. George Street, Toronto, ON, M5S 1A4, Canada

    Kaiwen Xia

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  1. Charles C. F. Kwan
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  2. Lin Wang
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Correspondence to Charles C. F. Kwan.

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Kwan, C.C.F., Wang, L., Xia, K. et al. Curved nanotwinned structure in Ni induced by dynamic compression. J Mater Sci 52, 13261–13270 (2017). https://doi.org/10.1007/s10853-017-1423-9

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  • DOI: https://doi.org/10.1007/s10853-017-1423-9

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