Abstract
Abstract The dislocation structure in Battelle-AISI ultrapure iron single crystals deformed at 60 K has been examined from the viewpoint of the orientation dependence of deformation and of the correlation with the softening produced by electron irradiation. Although the tensile specimens were oriented for single slip, a high density of secondary dislocations was always observed from an early stage of deformation. The crystals oriented for the hard (112) slip showed similar densities of primary and conjugate dislocations while the dislocations of all four a/2 〈111〉 Burgers vectors were observed in the soft (211) crystals. The dislocation structure was uniform throughout in both the irradiated and the unirradiated specimens but it was uneven in the carburized specimen. In every case, long, jogged screw dislocations and small dislocation loops dominated the dislocation morphology. An increase in dislocation density observed in the irradiated specimens hardly accounts for the irradiation softening observed; t...
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