From dislocation junctions to forest hardening |
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Authors: | Madec R Devincre B Kubin L P |
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Institution: | Laboratoire d'Etude des Microstructures, CNRS-ONERA, BP72, 92322 Chatillon Cedex, France. |
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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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