Nanotech 2002 Vol. 2
Nanotech 2002 Vol. 2
Technical Proceedings of the 2002 International Conference on Computational Nanoscience and Nanotechnology

Mechanical Properties at the Nanoscale Chapter 11

Dislocation Processes and Deformation Twinning in Nanocrystalline Al

Authors: V. Yamakov, D. Wolf, S.R. Phillpot and H. Gleiter

Affilation: Argonne National Lab, United States

Pages: 283 - 286

Keywords: dislocation processes, deformation twinning, nanocrystalline Al

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.

ISBN: 0-9708275-6-3
Pages: 504