Early stage damage of ultrafine-grained tungsten materials exposed to low energy helium ion irradiation

摘要

Tungsten is considered as a plasma facing component in the divertor region of the International Thermonuclear Experiment Reactor (ITER). High flux, high fluence helium (He) exposure of tungsten surfaces induces severe morphology changes and nanostructure formation, which may eventually erode tungsten and risk the operation of the reactor. In this study, we investigate the response of ultrafine-grained tungsten under low flux (similar to 10(20) ions m(-2) s(-1)), low fluence, low energy (30-70 eV) He irradiation at different temperatures in order to study the early stage of nanostructure formation. Rod-shape nanostructures formed at low temperatures (600 degrees C) and a He fluence of 1 x 10(23) m(-2). High resolution, cross-section TEM images of irradiated grains demonstrated bubble formation not inside the nanostructures but deep inside the grains. At higher temperatures (900 degrees C) and the same fluence of 1 x 10(23) m(-2), large tungsten asperities (stone-shape and fiber-form structures), which are attributed to the burst and erosion of the surface grains. Moreover, low fluence (10(20) m(-2)-10(21) m(-2)) and high temperature (900 degrees C) irradiation demonstrated low density of non-coalesced bubbles inside the TEM samples. The results suggest that morphology changes can exist in He irradiated tungsten even with low bubble densities; thus, an additional factor such as surface stresses may dictate the observed nanostructure formation. (C) 2015 Elsevier B.V. All rights reserved.