GEOMETRICAL FEATURES OF DISLOCATIONS GLIDING ON NONCOMPACT PLANES IN AL-ZN SINGLE-CRYSTAL

Single crystals were grown by the strain anneal technique. They were creep tested in stage I and the dislocation substructures which were pinned under load were observed by transmission electron microscopy. The following two points have been investigated: the geometrical features of dislocations gliding on non-compact planes (glide planes, shapes, evidence of deviation) correlated with the possible mechanism of glide on non-compact planes and the technique of evaluating local stresses from the radii of curvature of dislocations using the Dewit-Koehler line tension formulation.