Abstract
The firstly published electron diffraction patterns(EDPs) of icosahedral(I) quasicrystal in Al-Mn alloy show a perfect I symmetry. The high resolution electron microscope images of I quasicrystals are in agreement with the Penrose tiling. However, in most cases the quasicrystals have a special kind of defect caused by the quenched phason strain so that the I symmetry breaks down. It was demonstrated that a special linear phason strain makes the Al-Cu-Mg and Al-Cu-Li quasicrystals distorted such that they turn into some intermediate states between I phase and body centered cubic(bcc) phase. In this abstract three images of quasicrystals with phason strain of different strength are shown.Fig.1 is an image of Al-Cu-Fe quasicrystal taken along the five-fold axis with an EM-4000 electron microscope equipped with the side entry goniometer. The lower part shows a more or less perfect five-fold symmetry, and the arrangement of all points having equivalent enviroment obeys the golden ratio.
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