期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 60, 期 2, 页码 277-294出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2011.10.009
关键词
Nucleation; Molecular dynamics; Partial dislocations; Twinning; Nanocrystalline aluminum
资金
- Center for Advanced Metallic and Ceramic Systems (CAMCS) at the Johns Hopkins University
- Army Research Laboratory under the ARMAC-RTP [DAAD19-01-2-0003, W911NF-06-2-0006]
Plastic deformation in certain nanocrystalline metals (grain size less than 100 nm) or under certain conditions is associated with profuse activation of partial dislocations with grain boundaries acting as both the source and the sink. We use molecular dynamics (MD) simulations of pure aluminum to investigate the orientation dependence of deformation mechanisms, and show that two types of twins can be generated. Theoretical calculations are used to understand the effect of loading orientation on the activation of twins. The theoretical framework incorporates (a) a tensorial stress state, (b) dislocation loops and (c) non-singular core energies for accurate descriptions of criteria for partial dislocation activation. Both the theoretical predictions and the MD simulation demonstrate that twins should be possible (but rare) in nanocrystalline aluminum. (C) 2011 Elsevier Ltd. All rights reserved.
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