Dislocation core structure

Dislocation core structures of (100), (110) and (111) dislocations in NiAl have been studied by molecular statics calculations using a new many-body embedded atom potential. They... 

The inverse BDT for SrTiOs deformed along (100) or (110) is thought to be due to transformation of the dislocation core structure ]121] Gumbsch et al. [121] suggested a possible climb dissociation (more properly a decomposition) via the reaction... 

Simple Flexible Boundary Conditions for the Atomistic Simulation of Dislocation Core Structure and Motion. 

The core of PS and DG dislocations can be transformed from one to the other through several elementary mechanisms. The two basic mechanisms that allow dislocations moving over one atomic distance to switch from one set to the other are cross slip and climb (Fig. 32). Some mechanisms that can be involved in such transformations are similar to those proposed in the frame of composite models of dislocation core structures, in which a dissociated dislocation can move from glide set to shuffle set in its dissociated form (see, e.g., [1]). However, in composite models, the transformation mechanisms are relevant to the movement of partial dislocations from glide to shuffle positions and a constriction of the parent dislocations is not required. In the present case, the transformation mechanism concerns the change from perfect to dissociated dislocations (as well as the reverse transformation), and a different mechanism can also be involved, namely cross slip [57]. 

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