Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7968118 | Journal of Nuclear Materials | 2014 | 6 Pages |
Abstract
Atomic scale modelling methods have been used to study the change in vacancy population when H is introduced into the W bulk matrix. Vacancy defects are predicted to dominate in pure W, and the vacancy concentration is expected to be very small. A mechanism whereby H solutes facilitate vacancy formation has been outlined and a single H interstitial is predicted to reduce the vacancy formation energy from 2.95Â eV to 2.23Â eV. Clustering of H interstitials in W is predicted to be unfavourable without a W vacancy. H has also been shown to affect the vacancy binding characteristics in W, changing the behaviour from a repelling interaction in pure W, retarding the formation of small vacancy clusters, to an attractive interaction when vacancy-H clusters are considered. The changes in defect behaviour predicted, will have observable implications to operational properties and the application of W in fusion reactor components.
Related Topics
Physical Sciences and Engineering
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Nuclear Energy and Engineering
Authors
S.C. Middleburgh, R.E. Voskoboinikov, M.C. Guenette, D.P. Riley,