Journal
ACTA MATERIALIA
Volume 61, Issue 14, Pages 5449-5457Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.05.033
Keywords
Shear-coupled migration; Grain boundary sliding; Ductility; Strength
Funding
- CRCG fund of the University of Hong Kong
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An attempt has been made to illustrate a new physical mode of plastic deformation in nanocrystalline materials that synergizes two processes, i.e. grain boundary (GB) sliding and stress-driven shear-coupled GB migration. The latter process incorporates a rotational and a translational plastic flow, in which a normal migration is coupled with a shear. The energy change resulting from the above-mentioned mode was calculated, and showed that the new deformation mode was much more energetically favorable than both the pure GB sliding mode and the cooperative process of GB sliding and migration without a coupling shear. In addition, the new deformation mode considerably enhances the ductility of nanocrystalline materials compared with the other two above-mentioned processes. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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