Dislocation damping during electron irradiation A new model for the ‘peaking effect’

Recently Simpson and Sosin (1972) observed that, under suitable conditions, the internal friction of pure copper specimens increases and then decreases as a function of irradiation, whereas the modulus defect continuously decreases. They called this effect ‘the peaking effect’ and described it in terms of defect dragging. In this paper, a new model of this effect is presented, based on the kink-chain and the double-kink-generation models for dislocation motion, which can explain the peaking effect without the introduction of the defect dragging mechanism.