DISLOCATION MULTIPLICATION AND TRANSMISSION IN A BICRYSTAL
![](https://simap.grenoble-inp.fr/medias/photo/bicrystal_1237547424271.gif?ID_FICHE=147078)
Random sources are introduced in a closed grain (lower dodecahedron).
A tensile applied stress is applied along the vertical axis. Sources are then activated and a pile up is observed on the grain boundary. When the stress at the head dislocation in the pile up is high enough, a dislocation crosses the grain boundary and enters the upper grain.
Such a situation naturally leads to the Hall-Petch relationship between the grain size and the yield stress.
![](https://simap.grenoble-inp.fr/medias/photo/bicrystal_1237547424271.gif?ID_FICHE=147078)
Random sources are introduced in a closed grain (lower dodecahedron).
A tensile applied stress is applied along the vertical axis. Sources are then activated and a pile up is observed on the grain boundary. When the stress at the head dislocation in the pile up is high enough, a dislocation crosses the grain boundary and enters the upper grain.
Such a situation naturally leads to the Hall-Petch relationship between the grain size and the yield stress.
![](https://simap.grenoble-inp.fr/medias/photo/3d4_1237393123837.gif?ID_FICHE=147078)
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