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From dislocation junctions to forest hardening
Authors:Madec R  Devincre B  Kubin L P
Institution:Laboratoire d'Etude des Microstructures, CNRS-ONERA, BP72, 92322 Chatillon Cedex, France.
Abstract:The mechanisms of dislocation intersection and strain hardening in fcc crystals are examined with emphasis on the process of junction formation and destruction. Large-scale 3D simulations of dislocation dynamics were performed yielding access for the first time to statistically averaged quantities. These simulations provide a parameter-free estimate of the dislocation microstructure strength and of its scaling law. It is shown that forest hardening is dominated by short-range elastic processes and is insensitive to the detail of the dislocation core structure.
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