The conditions for the existence of extended 2c+a super-dislocations on first-order and second-order pyramid planes were analyzed for an ordered alloy with the D019 structure. The thermally activated process of transformation of glissile super-dislocations into dislocation barriers, that arose via the cross-slip of part of a c+a/2 super-partial dislocation on a basal or a pyramid plane, was studied. Activation energies for the formation of barriers were calculated as a function of the applied shear stress along the  [00▪1] direction, for various values of the parameters that characterized the dissociation of glissile and blocked super-dislocations in an intermetallic compound. The activation energy for formation at edge dislocations, upon the passage of a partial dislocation onto the basal plane, was shown to be much higher than that for the formation of barriers at screw dislocations, upon the passage of a partial dislocation onto the prism plane.

Thermally Activated Transformations of Glissile 2c+a Super-Dislocations in Alloys with a D019 Superstructure. L.I.Yakovenkova, L.E.Karkina, M.Y.Rabovskaya: Physics of Metals and Metallography, 1999, 87[3], 190-5