Stress Distribution in the Direction of 1-D Motion of an Interstitial Loop

We studied a stress distribution around a dislocation loop to know the effect of compressive stress on 1-D motion of defect clusters. And we presented the effect of 1-D motion on the radiation hardening. Two mechanisms of radiation hardening have been proposed. One is a dispersed barrier hardening mechanism. This explains defect clusters as barriers to a dislocation motion. And the other is a cascade induced source hardening mechanism, which places emphasis on the role of defects as a Cottrell atmosphere for dislocation motions. The interaction between dislocation and defect clusters has been considered, but the self-motion of clusters was not considered. No model has given a solution to the 1-D motion of defect clusters of a size of over 2 nm. Though the 1-D motion of defect clusters was observed by many researchers, they did not consider its effect on radiation hardening. To establish the effect of a 1-D motion on radiation damage, it is important to clarify the driving force of this motion. At this time, we tried to find out stress field into the motion direction of clusters through calculations with equations suggested by T. A. Kraishi et al