CREEP OF AN AL-CO-CU QUASI-CRYSTAL

The steady-state creep behaviour and dislocation configurations genera ted by the creep of a quasicrystal have been reported for the first ti me. Volume-diffusion controlled climb of dislocations is the probable rate-controlling mechanism for steady-state creep deformation of an Al 65Co20Cu15 quasicrystal in the investigated temperature and stress ran ge. Two different configurations of dislocations, namely complex and k inked, were observed. All these dislocations, which consist of both ed ge and screw segments, have Burgers vectors parallel to the tenfold ax is. A complex dislocation configuration arises because of dislocation generation at the kink nodes.