In situ observations were made of the 1-dimensional glide motion of defect clusters under HVEM irradiation. In order to examine the effects of interstitial impurity atoms and alloying elements, V, of 2 purity levels, and V–5Ti were prepared and examined. In all materials, self-interstitial type dislocation loops were formed and grew during irradiation. Loop glide was frequently observed under conditions of extremely high irradiation intensity. Motion was more frequently observed when clusters were small, and generally, decreased as clusters grew. All clusters glided 1-dimensionally, back and forth between other neighboring loops, indicating the driving force for motion was the variation of the force field gradient around loops. The frequency and distance of motion were significantly decreased by interstitial impurities and solutes in the material. The dynamical characteristics of 1-dimensional motion under HVEM irradiation were discussed. It could be concluded that impacts of 1-dimensional motion in practical alloys were less important than those in pure metals.

In situ Observation of Glide Motions of SIA-Type Loops in Vanadium and V–5Ti under HVEM Irradiation. T.Hayashi, K.Fukumoto, H.Matsui: Journal of Nuclear Materials, 2002, 307-311[2], 993-7