Abstract
High-resolution electron microscopy indicates that the edge-type dislocations observed in small-angle boundaries on Al 62 Cu 20 Co 15 Si 3 decagonal quasicrystals dissociate into two partial dislocations. The projected Burgers vectors of these partial dislocations on the plane normal to the twofold A2D axis are b 1 =[a 1 /2, a 2 , 0, 0, 0, 0] and b 2 =[a 1 /2, -a 2 , 0, 0, 0, 0] respectively. The modulus of the total Burgers vector b=[a 1 ,0,0,0,0,0] is about 0.4 nm corresponding to the periodicity along the tenfold axis of the decagonal quasicrystal
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