Abstract
Solid solution softening and the orientation dependence of yield stress can be regarded as the two most important phenomena characterizing the low temperature plastic deformation of b.c.c. metals. Recently, the orientation dependence of solid solution softening was reported in electron irradiated pure iron in which self-interstitial atoms simulate the solid solution effect. Single crystals oriented for the hard (112) slip showed the largest softening effect and became the softest crystals after irradiation (Fig. 1). Also, the shape of the stress-strain curve for the irradiation-softened crystal suggests that the irradiation may have influenced the dislocation structure at an early stage of deformation. Specimens oriented for the soft (211) slip showed hardly any effect. In this study, the dislocation structure was investigated to determine the mechanism responsible for the softening effect and the orientation dependence.
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