The strain-rate cycling tests during the Blaha effect measurement were carried out for KCl:Sr2+ single crystals at 80 to 240K. Activation enthalpy, H, for the breakaway of the dislocation from the impurity was obtained by using the (∆τ'/ ∆1nε)p , which is given by the difference between strain-rate sensitivity at first plateau place and at second one on the relative curve of strain-rate sensitivity and stress decrement. As a result,Ｈ(Tc) was found to be 0.63eV on the assumption that the interaction between a dislocation and the impurity is approximated by the Fleischer’s model. Tc is the critical temperature, at which the effective stress is zero.
moving dislocation
strain-rate sensitivity due to impurities
activation enthalpy