Dislocation motion in icosahedral Al-Pd-Mn quasicrystals was observed in situ in a transmission electron microscope between 700 and 750°C. Contrast analyses show that it takes place by pure climb in twofold, threefold and fivefold planes. Moving dislocations exhibit polygonal shapes with edges parallel to twofold directions, in agreement with a difficult jog-pair nucleation. Dislocation multiplication, annihilation and local pinning were described and discussed, as well as the role of the phason faults trailed in the wake of dislocations, at the lowest investigated temperatures.

In situ Observation of Dislocation Motion in Icosahedral Al-Pd-Mn Quasicrystals. F.Mompiou, D.Caillard, M.Feuerbacher: Philosophical Magazine, 2004, 84[25-26], 2777-92