Dislocations, domains and quenched phonon and phason strains in Al-Mn quasicrystals observed by electron microscopy

Abstract Several kinds of edge dislocations and domain structures as well as some structural irregularities interpreted as arising from quenched phasons and phonon strains have been observed in Al-Mn quasicrystals by HREM and subsequent image processing. Noise-reduced pictures were obtained by pseudo-optical filtering of selected diffraction peaks. The line vectors and Burgers vectors of the dislocations have been determined and are indexed in a six-dimensional coordinate system. The results indicate a relatively strong phonon-phason coupling in the quasicrystals.

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