Journal
MATERIALS LETTERS
Volume 65, Issue 17-18, Pages 2769-2771Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2011.05.095
Keywords
Nanoclystalline metals; Deformation and fracture; Grain orientation; Grain boundaries
Funding
- National Science Foundation of China [11002124]
- Science Foundation of Chinese University [2009QNA4034]
- China Postdoctoral Science Foundation [20100481421]
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Nanocrystalline Au films were in situ strained in a high resolution transmission electron microscope, which demonstrated that the diffusion-assisted intergranular fracture was the dominant failure mode. Grain orientation with respect to grain boundaries (GBs) imposes important effect on the crack propagation and blunting. The low surface energy and high diffusion mobility of {111} planes lead to a notch-like crack. The stress concentration at the tip may help breaking {111} planes layer by layer and thus advance the crack. Cracks can be diverted from the preset path by CBs and grow into the grain interior, which has never been revealed by other experiments and molecular dynamics simulations. (C) 2011 Elsevier B.V. All rights reserved.
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