Dislocation migration and phason strain relaxation in a quasicrystal

Phason flips accompanying the glide of a perfect dislocation has been exami ned using the Burkov model of the decagonal quasicrystal which is a pseudob inary alloy of Al and transition metals. It is shown that the glide of a pe rfect dislocation is difficult without producing chemical disorder. There a re three extreme cases in the glide of a dislocation in quasicrystal: first ly conservative glide at a very high temperature where the complete phason relaxation occurs; secondly, glide producing chemical disorder; thirdly gli de producing a stacking fault with the fault vector of the phason component of the Burgers vector.