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Unusual super-ductility at room temperature in an ultrafine-grained aluminum alloy

  • Ultrafine Grained Materials
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Abstract

Processing by severe plastic deformation (SPD) typically increases the strength of metals and alloys drastically by decreasing their grain size into the submicrometer or nanometer range but the ductility of such materials remains typically low. This report describes the first demonstration that it is possible to increase the room temperature ductility of aluminum-based alloys processed by SPD and to attain elongations to failure of >150% while retaining the enhanced strength. This unique combination of properties is due to the occurrence of grain boundary sliding at room temperature. The sliding was obviously achieved by introducing a grain boundary wetting of the aluminum/aluminum grain boundaries.

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Acknowledgements

We thank Mr. Peter Szommer for assistance with the AFM measurements. This work was supported by the Russian Foundation for Basic Research under Grants No. 08-08-97044 and 09-08-92656 and Federal Agency for Science and Innovations (RZV, MYuM, ARK), the Russian Foundation for Basic Research under Grants No. 09-03-92481, 09-03-00784 and 08-08-91302) (BBS), the Hungarian Scientific Research Fund, OTKA, under Grant No. K67692 and K81360 (NQC) and the National Science Foundation of the United States under Grant No. DMR-0855009 (TGL).

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Authors and Affiliations

  1. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marx str., Ufa, Russia, 450000

    Ruslan Z. Valiev, Maxim Yu. Murashkin & Askar Kilmametov

  2. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow district, 142432, Russia

    Boris Straumal

  3. Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, 70569, Stuttgart, Germany

    Boris Straumal

  4. Department of Materials Physics, Eötvös Loránd University, Pázmány Péter s. 1/A, Budapest, 1117, Hungary

    Nguyen Q. Chinh

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

    Terence G. Langdon

  6. Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, UK

    Terence G. Langdon

Authors
  1. Ruslan Z. Valiev
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  2. Maxim Yu. Murashkin
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  3. Askar Kilmametov
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  4. Boris Straumal
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  5. Nguyen Q. Chinh
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  6. Terence G. Langdon
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Correspondence to Ruslan Z. Valiev.

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Valiev, R.Z., Murashkin, M.Y., Kilmametov, A. et al. Unusual super-ductility at room temperature in an ultrafine-grained aluminum alloy. J Mater Sci 45, 4718–4724 (2010). https://doi.org/10.1007/s10853-010-4588-z

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  • DOI: https://doi.org/10.1007/s10853-010-4588-z

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