The atomic structures of edge dislocations with Burgers vectors of [100¯10] and [11¯1¯10] were computer-simulated for a model binary decagonal quasicrystal that was based upon the Burkov model. After static relaxation of the dislocated structure using interatomic potentials, the core of the dislocations dissociated into 2 partial dislocations. The separation between them was equal to 1.0nm for the [100¯10] dislocation and to 0.8nm for the [11¯1¯10] dislocation. By applying a shear stress so as to exert a force on the dislocations, plastic deformation began to occur at 10% of the shear modulus; in both dislocated and non-dislocated models. Examination of the structure revealed that the plastic deformation was brought about by inhomogeneous localized shear deformations in the regions between tenfold-symmetrical atomic clusters. The stress which was required to move the dislocations without thermal activation was higher than the ideal shear strength.

Computer Simulation of Dislocations and Plastic Deformation in a Model Decagonal Quasicrystal. T.Tei-Ohkawa, K.Edagawa, S.Takeuchi: Journal of Non-Crystalline Solids, 1995, 189[1-2], 25-35