Abstract
Phason flips accompanying the glide of a perfect dislocation has been examined using the Burkov model of the decagonal quasicrystal which is a pseudobinary alloy of Al and transition metals. It is shown that the glide of a perfect dislocation is difficult without producing chemical disorder. There are three extreme cases in the glide of a dislocation in quasicrystal: firstly conservative glide at a very high temperature where the complete phason relaxation occurs; secondly, glide producing chemical disorder; thirdly glide producing a stacking fault with the fault vector of the phason component of the Burgers vector.