Deformaiton experiments were performed on single crystals of the #xi#-AlPdMn approximant in bendifng geometry at high temepruature.two differnt mechanisms of plastic deformaiton are shown to exist in this phase: one based on dislocations and another novel mechanism based on the motion of phason lines.Burgers vector and ine directions of dislocaitosn were determined.Phason lines are shown to build a periodic lattice.the interaction of a dislocation with the phason line lattice results in dislocations on another length scale.This meta-dislocaiton in the periodic phason line lattice has a Burgers vector of magnitude 165 A.the relative importance of phason lines and dislocaitosn for the plastic deformation is discussed as a function of the orientation of the sample with respect to the bendifng geometry.
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