Dislocation Processes and Deformation Twinning in Nanocrystalline Al

	Nanotech 2002 Vol. 2 Technical Proceedings of the 2002 International Conference on Computational Nanoscience and Nanotechnology Chapter 11: Mechanical Properties at the Nanoscale
	Dislocation Processes and Deformation Twinning in Nanocrystalline Al
Authors:	V. Yamakov, D. Wolf, S.R. Phillpot and H. Gleiter
Affilation:	Argonne National Lab, US
Pages:	283 - 286
Keywords:	dislocation processes, deformation twinning, nanocrystalline Al
Abstract:	Using a recently developed, massively parallel molecular-dynamics (MD) code for the simulation of polycrystal plasticity, we analyze for the case of nanocrystalline Al the complex interplay among various dislocation and grain-boundary processes during low-temperature deformation. A unique aspect of this work, arising from our ability to deform to rather large plastic strains and to consider a rather large grain size, is the observation of deformation under very high grain-boundary and dislocation densities, i.e., in a deformation regime where they compete on an equal footing. We are thus able to identify the intra- and intergranular dislocation and grain-boundary processes responsible for the extensive deformation twinning observed in our simulations. This illustrates the ability of this type of simulations to capture novel atomic-level insights into the underlying deformation mechanisms not presently possible experimentally.
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ISBN:	0-9708275-6-3
Pages:	504
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