A study was made of poly-grained Al70Pd21.5Mn8.5 icosahedral quasi-crystals which had been deformed at high temperatures. By using contrast analyses, the dislocation was deduced to have a Burgers vector that was parallel to the 2-fold direction, [1/1 0/1 1/0], and a line direction that was parallel to the 2-fold direction, [0/1 1/0 1/1]. The angle between B and U was found to be 32, so that the dislocation was mixed in nature. The screw component of the dislocation was found to be parallel to a 2-fold direction, while the edge component was parallel to the pseudo 2-fold direction, [1/2 1/1 -2/-1]. By considering the characteristics of the dislocation, it was predicted that slip could occur on 5-fold planes; thus permitting 30 slip systems.

J.E.Shield, M.J.Kramer: Scripta Materialia, 1996, 35[8], 913-8