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

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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.