Dislocation/Obstacle Interactions During Low-Dose Irradiation Creep of Nickel

摘要

Analyses of interactions between gliding dislocations and irradiation-induced obstacles indicated that loop unfaulting, loop annihilation, and loop sweeping can control low-dose irradiation creep in fcc metals. Dislocation reactions remove glide barriers from active slip planes and rationalize rapid creep rates observed in deuteron irradiated nickel. Irradiation creep experiments revealed that pre-irradiation reduced irradiation creep rates in annealing Ni whereas pre-irradiation had little effect on creep rates in cold-worked Ni. Dislocation/obstacle interactions and the role of the applied stress in barrier removal processes were related to observed irradiation creep responses. (ERA citation 09:000791)