It was recalled that, in ordered intermetallics with the L12 structure, cross-slip from the primary {111} glide plane and onto a {010} cube plane (leading to locked configurations) was thought to be responsible for a peak in the temperature dependence of the flow stress. Previous calculations of the cross-slip activation energy, within the framework of linear elastic continuum theory, had been impaired by an ill-defined core cut-off parameter and an unknown recombination distance for Shockley partials. The core energy arising from the Peierls model, and the interaction energies of dislocation segments, were determined here within the framework of linear anisotropic elasticity theory. Of the 2 possible processes with a cross-slip distance of b/2 or b, the latter was energetically favored. Activation energies and activation areas were presented as a function of the applied stress in the cross-slip plane: giving ∆G = 1 to 2eV and a = 5 to 10b2 as typical values for Ni3Al. The results were consistent with published atomistic calculations.

The Activation Energy of Cross-Slip in L12 Ordered Alloys. Püschl, W.: Materials Science and Engineering A, 2001, 319-321, 266-9