Journal
ACTA MATERIALIA
Volume 59, Issue 12, Pages 5023-5031Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.04.056
Keywords
Nanocrystalline materials; Cracks; Grain boundary sliding; Grain boundary migration
Funding
- Russian Ministry of Education and Science [14.740.11.0353]
- Russian Academy of Sciences
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A new mechanism of fracture toughness enhancement in nanocrystalline metals and ceramics is suggested. The mechanism represents the cooperative grain boundary (GB) sliding and stress-driven GB migration process near the tips of growing cracks. It is shown that this mechanism can increase the critical stress intensity factor for crack growth in nanocrystalline materials by a factor of three or more and thus considerably enhances the fracture toughness of such materials. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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