Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4883396
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Funding
- Los Alamos National Laboratory Directed Research and Development (LDRD) [20130745ECR]
- Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [2008LANL1026]
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The exceptional strength of nanoscale metallic grains is due to strain-accommodation mechanisms that are uncommon in their coarse-grained counterparts, such as deformation twinning. Using an ab initio density functional theory-phase field dislocation dynamics model, we provide evidence of an unconventional kinetic pathway for twin formation in nano-sized crystals involving two grain boundaries. It corresponds to greater favorability because it accommodates strain yet removes debilitating backstresses. A simple map is presented to relate the associated kinetics of nucleation and propagation to intrinsic material defect formation energies. (C) 2014 AIP Publishing LLC.
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