A computer simulation of dislocation in a model quasi-periodic lattice indicates that the dislocation feels a large Peierls potential when oriented in particular directions. For a dislocation with a high Peierls potential, the glide velocity and the climb velocity of the dislocation could be described almost in parallel in terms of the kink-pair formation followed by kink motion and the jog-pair formation followed by jog motion, respectively. The activation enthalpy of the kink-pair formation was the sum of the kink-pair formation enthalpy and the atomic jump activation enthalpy, while the activation enthalpy of the jog-pair formation involves the jog-pair enthalpy and the self-diffusion enthalpy. Since the kink-pair energy could be considerably larger than the jog-pair energy, the climb velocity could be faster than the glide velocity, so that the plastic deformation of quasicrystals could be brought not by dislocation glide but by dislocation climb at high temperatures.

Dislocation Processes in Quasicrystals - Kink-Pair Formation Control or Jog-Pair Formation Control. S.Takeuchi: Materials Science and Engineering A, 2005, 400-401, 306-10