Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 58, Issue 7, Pages 1011-1025Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2010.04.010
Keywords
Microstructures; Dislocations; Grain boundaries
Funding
- National Science Foundation [CMS-0547681]
- Army High Performance Computing Research Center at Stanford
- Benchmark Stanford Graduate Fellowship
- Air Force office of Scientific Research
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The orientation dependent plasticity in metal nanowires is investigated using molecular dynamics and dislocation dynamics simulations. Molecular dynamics simulations show that the orientation of single crystal metal wires controls the mechanisms of plastic deformation. For wires oriented along < 110 >, dislocations nucleate along the axis of the wire, making the deformation homogeneous. These wires also maintain most of their strength after yield. In contrast, wires oriented along < 111 > and < 100 > directions deform through the formation of twist boundaries and tend not to recover when high angle twist boundaries are formed. The stability of the dislocation structures observed in molecular dynamics simulations are investigated using analytical and dislocation dynamics models. (C) 2010 Elsevier Ltd. All rights reserved.
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