Plastic deformation in a quasi-periodic lattice was modelled on the basis of the Peierls mechanism for dislocation glide. High or low activation enthalpies were assumed, corresponding to large and small Peierls potentials, for kink-pair formation in the quasi-periodic Peierls potential. In an unstrained high-quality quasicrystal, dislocation glide was essentially controlled by the high activation enthalpy whereas, in the highly-strained state where a high density of phason defects was introduced, dislocation glide was controlled by the low activation enthalpy. Parts with a high Peierls potential could be overcome by the side motion of kinks produced at parts with a low Peierls potential.

Plastic Deformation of Icosahedral Al-Pd-Mn Single Quasicrystals to Large Strains - II. Deformation Mechanism. S.Takeuchi, R.Tamura, E.Kabutoya, K.Edagawa: Philosophical Magazine, 2002, 82[2], 379-85