Abstract
Iron single crystals with the [100] and [110] axes are extended in the range between -125° and 900°C under cyclic changes of crosshead velocity between 0.5 and 5 mm/min at an interval of 5% in elongation. The flow stress at low temperatures can be divided into the strain-rate dependent stress and the stress increment due to work-hardening. Above 100°C, on the other hand, the flow stress depends strongly on the strain and strain-rate history. It is concluded that the variation of flow stress after the strain-rate changes in the high-temperature type deformation above 200°C does not arise from the dynamic properties of individual dislocations in motion, but from the properties of cell structures and discontinuous slips.
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