Abstract
Tungsten was irradiated with 400keVKr+ ions using the IVEM-Tandem Facility at Argonne National Laboratory. The evolution of microstructure and gas bubbles during the irradiation was observed by in situ transmission electron microscopy. Under irradiation, dislocation loops were created and grew into an increased density of network dislocations with increasing Kr+ ion fluence. The irradiation induced final microstructure consists of dislocation cells ∼50nm in diameter separated by dislocation walls. The irradiation also induced formation of Kr gas bubbles with an average diameter of 1.4nm after 3.0×1016ions/cm2 at 525K. The gas bubbles were observed to grow to 2.6nm diameter after additional Kr-irradiation of 5.0×1016ions/cm2 at 815K. The relationship between bubble size and irradiation time was obtained from experimental data obtained at 815K and an empirical formula for calculating Kr bubble size was developed by fitting bubble growth equations with experiment data. The growth mechanisms of Kr gas bubbles in tungsten are discussed.
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