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Title: Assessment of the literature about Be-W mixed material layer formation in the fusion reactor environment

Journal Article · · Materials Research Express (Online)

Abstract All plasma facing surfaces in a fusion reactor, whether initially pure or an alloy, will rapidly evolve into a mixed material due to plasma-induced erosion, migration and redeposition. Beryllium (Be) erosion from the main chamber, and its transport and deposition on to a tungsten (W) divertor results in the growth of mixed Be-W layers, which can evolve to form beryllides. These Be-W mixed materials exhibit generally less desirable properties than pure tungsten or pure beryllium, such as lower melting points. In order to better understand the parameter space for growth of these alloys, this paper reviews the literature on Be-W mixed material formation experiments—in magnetically confined fusion reactors, in linear plasma test stands, and during thin-film deposition—and on computational modeling of Be-W interactions, as well as briefly assesses the Be-W growth kinetics. We conclude that the following kinetic steps drive the material mixing: adsorption of the implanted/deposited ion on the metal surface; diffusion of the implanted/deposited ion from surface into the bulk, which is accelerated by defects; and loss of deposited material through erosion. Adsorption dominates (or prevents) material mixing in thin-film deposition experiments, whereas diffusion drives material mixing in plasma exposures due to the energetic ion implantation.

Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
NONE; SC0006661
OSTI ID:
2317697
Alternate ID(s):
OSTI ID: 2311010; OSTI ID: 2426826
Journal Information:
Materials Research Express (Online), Journal Name: Materials Research Express (Online) Journal Issue: 3 Vol. 11; ISSN 2053-1591
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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