ALN PLASTIC-DEFORMATION BETWEEN ROOM-TEMPERATURE AND 800-DEGREES-C - II - DISLOCATION CORE STRUCTURES IN BASAL AND PRISMATIC PLANES

Observations of dislocation substructures have shown that the basal an d first-kind prismatic planes are easily activated in plastically defo rmed aluminium nitride between room temperature and 800 degrees C as s hown in the companion paper, part I. In this paper, several analyses a re performed to determine the ability of dislocations to glide in one plane relative to others. According to the closest-packed criterion, t he first-kind prismatic plane appears to be favoured. Line energy calc ulations under anisotropic elasticity do not allow one to conclude the preferential activation of one of the glide planes. The crystallograp hic structures of basal and first-kind prismatic planes, core structur es of dislocations and dissociation reactions are investigated and sta cking-fault configurations in prismatic planes are proposed.