Transmission electron microscopic investigations were made of plastically deformed and non-deformed single quasicrystals. Planar defects were observed in heat-treated quenched samples and in deformed samples. These were identified as being antiphase boundaries of the face-centered icosahedral structure. A marked increase in the density of antiphase boundaries during plastic deformation was observed, and was attributed to the movement of partial dislocations. The plane normals of the antiphase boundaries were determined for variously treated samples. In the case of heat-treated and quenched samples, 90% of the plane normals were found to be parallel to 5-fold directions. In deformed samples, planes which were perpendicular to pseudo 2-fold <1/1 2/1 1/2> directions were most frequently observed. These planes were inclined by an angle of 46° with respect to the [0/0 0/0 0/2] compression direction, and therefore had a high Schmid factor.

Antiphase Domains in Plastically Deformed Zn-Mg-Dy Single Quasicrystals. M.Heggen, M.Feuerbacher, P.Schall, K.Urban, R.Wang: Physical Review B, 2001, 64[1], 014202 (6pp)