It was noted that a dislocation which moved through a quasi-crystal left a phason wall in its wake. For a 2-dimensional model quasi-crystal, the disregistry energy of this phason wall was studied in order to determine possible Burgers vectors for the structure. Unlike the case of periodic crystals, the disregistry energy was an average quantity, with large fluctuations at the atomic scale. The dislocation core structure and mobility therefore could not be linked to this quantity. Atomistic simulations showed that dislocation motion was controlled by local obstacles that were inherent to the atomic structure of the quasi-crystal.

Dislocations in Quasicrystals and their Interaction with Cluster-Like Obstacles. R.Mikulla, P.Gumbsch, H.R.Trebin: Philosophical Magazine Letters, 1998, 78[5], 369-76