Effect of interstitial impurities on the temperature dependence of the resistance to edge dislocation motion in α-iron

The temperature dependence of the macroscopic elastic limit of iron polycrystals with various carbon content is investigated. On their basis, the temperature dependence of the resistance to edge dislocation motion is determined. At T<295°K it is linear and increases with carbon concentration owing to the reduction of the activation volume, whereas the activation energy is independent of the carbon concentration. It is shown that to start the dislocation motion from the source, a larger stress is required than for its motion in the grain bulk, and that this stress increases with carbon concentration.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 85–89, March, 1984.