Dislocations and phason faults were studied, using transmission electron microscopy, in Al-Pd-Mn samples deformed at 300C under high pressures. All of the dislocation movement occurred via climb; contrary to the usual interpretation of dislocation motion in quasicrystals. Several modes of dislocation dissociation and decomposition were observed; permitting the estimation of phason fault and antiphase-boundary energies. Work softening was instead explained in terms of varying chemical stress.

Dislocation Climb and Low-Temperature Plasticity of an Al-Pd-Mn Quasicrystal. F.Mompiou, L.Bresson, P.Cordier, D.Caillard: Philosophical Magazine, 2003, 83[27], 3133-57