Single quasicrystals of Al₇₀{Pd}₂₁Mn₉ were plastically deformed by 25% under compression at 750 C. Both these samples as well as control samples of as-grown and heat-treated material were investigated by transmission electron microscopy. It was found that upon deformation the dislocation density increases by about 2 orders of magnitude. This provides the first direct evidence for quasicrystal deformation by a dislocation mechanism. The dislocations were found to have twofold and fivefold Burgers vector directions in physical space.
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Wollgarten et al. (1993) studied this question.