Tensile Deformation of Iron Single Crystals Having the [100] and [110] Axes between -70°C and 250°C

Abstract

Sheet specimens of iron single crystals having the (001) plane in the sheet surface and having the [100] or [110] tensile axis were extended under two strain rates between -70°C and 250°C. The stress-strain curves of the crystals of both orientations showed rapid hardening in the initial stage, and showed slow and linear hardening in the later stage. The temperature dependence of the work hardening rate of the [100] crystals was stronger than those of the [110] crystals. In the deformation of the [100] crystals, slip took place in four equivalent directions in the initial stage and locally in single direction in the later stage. In the [110] crystals, slip took place in two equivalent directions. Temperature and strain rate dependences of the necking and fracture behavior were discussed in relation to the work hardening behavior.