Abstract
A theoretical model is proposed which describes energetic characteristics and behavioral features of edge dislocations in coarse-grained and nanostructured quasicrystals. The key point of the model is representation of dislocation-induced phason imperfections as centers of isotropic dilatation (flexes). The special attention in this paper is paid to the influence of the nanoscale structure on both energetic characteristics and behavioral features of edge dislocations in nanostructured quasicrystals (nanoquasicrystalline materials). It is shown, in particular, that the basic grain-size-sensitive contribution of dislocation-induced phason imperfections to the total energy of an edge dislocation varies directly with grain size, in which case the formation of edge dislocations is not suppressed in nanoquasicrystalline materials (in contrast to coarse-grained quasicrystalline materials.
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