|About this Abstract
||2014 TMS Annual Meeting & Exhibition
||Multiscale Approaches to Hydrogen-assisted Degradation of Metals
||First-principles Models for Radiation Damage in D-T Fusion Power Plants
||Duc Nguyen-Manh, S.L. Dudarev
|On-Site Speaker (Planned)
We review current work on first-principles modelling of radiation defects in bcc iron-based ferritic steels and tungsten-based alloys, which are candidate structural materials for the first wall and divertor applications in a deuterium-tritium fusion power plant. DFT calculations predict that stable radiation defect configurations in iron are different from those formed in non-magnetic bcc metals. Our ab-initio study of phase stability of tungsten alloys exhibits strongly fluctuating defect energies as functions of concentration, resulting from fluctuations of local atomic environment. We have carried out a systematic study of defects associated with the incorporation of He and other inert-gas atoms into all bcc transition metals. A remarkable variation of binding energy between noble-gas atoms and vacancies has been validated by thermal desorption spectroscopy measurements in tungsten. A DFT database has been used for re-evaluating of the life-time of components in a fusion power plant within an integrated model.
||Planned: Paper Selections