Abstract
The possible effects of cascade damage on irradiation creep and growth are investigated. The formulation previously developed for investigating the effects of cascade irradiation in systems with a single class of dislocations is extended to systems with several non-equivalent classes of dislocations. An expression for the climb velocity as a function of applied stress is derived. The corresponding irradiation-induced deformation strain rate from dislocation climb is derived from this expression. It is found that when the production bias effect is important, only a small portion of the net interstitial flux into the dislocations can respond to an applied stress. It is also found that production bias can cause a sharp increase in growth rate at high temperatures in zirconium alloys, similar to the swelling behaviour of steels.