The basic mechanisms of the sub-structure hardening of network and cell dislocation structures were considered in terms of quantitative data from the transmission electron microscopic investigation of foils and replicas. A comparative analysis of the barrier and contact dislocation resistances was carried out. These types of dislocation resistance made the main contribution to work-hardening. A sharp distinction was made between dislocation ensemble properties where work-hardening was governed by the relationships: τ ~ ρ½ and τ ~ D-1. Attention was drawn to the presence of a softening-fluctuation contribution to the flow stress, which increased with increasing inhomogeneity of the dislocation distribution.

Contact and Barrier Dislocation Resistance and their Effect on Characteristics of Slip and Work Hardening. E.V.Kozlov, N.A.Koneva, L.A.Teplyakova, D.V.Lychagin, L.I.Trishkina: Materials Science and Engineering A, 2001, 319-321, 261-5