Abstract
Abstract The effect of the number and duration of electron irradiation cycles, the temperature and the applied stress on the creep of nickel has been studied. It was found that creep accelerates instantaneously at the initial stage of irradiation, and then decelerates on further irradiation. The magnitude of the effect of instantaneous creep acceleration increases sharply with decreasing initial rate of thermal creep before irradiation. The thermoactivation analysis of the creep process is carried out for both thermal conditions and the irradiation process. A change in the creep mechanism is revealed under thermal conditions near 300°C; at lower temperatures the creep is controlled by the motion of the jogged screw dislocations, with a considerable contribution from dislocation pipe diffusion. At higher temperatures the glide of the edge dislocations with impurities is the controlling mechanism. The irradiation creep over the whole temperature range (200–500°C) is controlled by the glide of edge dislocati...
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