ACTIVATION ENERGY FOR ELASTIC INTERACTION BETWEEN FRANK DISLOCATION LOOPS AND GLIDE DISLOCATIONS IN FCC METALS

The activation energy ΔG for the thermally activated passing of glide dislocations close to Frank dislocation loops which do not intersect the slip planes is calculated by means of the linear theory of elasticity as a function of the applied stress, of the distances loop centre-slip plane, and of the orientations and radii of the loops. The influence of anisotropy on ΔG is investigated for some f.c.c. metals, especially for copper. For sufficiently high stresses the dependence of ΔG on stress is shown to approach the ΔG-stress expression suggested by Seeger in his theory of radiation hardening. © 1969 Czechoslovak Academy of Sciences.