Numerical calculation of strain rate of interstitial solid solutions under irradiation. 1. Radiation creep model

The model of radiation creep for interstitial solid solutions is developed on the basis of combined motion of dislocations which includes their slip and their climb over obstacles. Dislocations of forest and clusters of radiation-induced point defects play the role of obstacles. The formula for strain rate calculation is derived. It allows describing the creep at high stresses when slip dislocations climb over the part of barriers by force. The method of determining a mean distance travelled by the dislocation in a slip plane under the action of stress initial it stops at a barrier is presented. Calculation technique is given for numerical determination of fluxes of intrinsic point defects and point defect-interstitial atom complexes. This technique permits calculating the velocity of dislocation climb over the barriers. The results are compared with those of other authors. It is shown that the expressions provided by such earlier known models of radiation creep as SIPA-mechanism, the Gittus-Mansur theory, the slip-climb over model, can be derived from the formula obtained as the special cases