Dislocation-assisted grain growth in nanocrystalline copper under large deformation

XL Ma and W Yang, SCRIPTA MATERIALIA, 59, 792-795 (2008).

DOI: 10.1016/j.scriptamat.2008.06.022

Dislocation plasticity conventionally induces textures in polycrystalline metals after a large deformation. We used parallel molecular dynamics to simulate the plastic deformation of nanocrystalline copper to an isochoric stretch up to 100% logarithmic strain. We found that the movements of partial dislocations that dominate the deformation process do not lead to texture formation. The grain size distribution becomes extremely inhomogeneous. By observing the structural evolution, we demonstrate that grain growth assisted by partial dislocations suppresses the texture formation. Crown Copyright (c) 2008 Published by Elsevier Ltd. on behalf of Acta Materialia Inc. All rights reserved.

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