Dislocation motions in 5-fold planes of icosahedral Al-Pd-Mn Original Research Article

Dislocations moving in 5-fold planes of icosahedral AlPdMn have been observed in in situ heating TEM experiments. Similar dislocations forming a deformation band in the as-grown material have been analyzed in bright field and in LACBED conditions. Their Burgers vectors are translations of the 6-dimensional hyperlattice, with components in the physical space along 2-fold directions out of the plane of motion. Dislocations have accordingly moved by climb, presumably with a difficult jog-pair nucleation.