About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
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Presentation Title |
Co-Segregation of Transmuted Re and Os in Neutron Irradiated Tungsten: First-principles Prediction and Experimental Validation |
Author(s) |
Duc Nguyen-Manh, Matthew J. Lloyds, Jan S. Wrobel, Michael Klimenkov, Luca Messina, Enrique Martinez, Mark R. Gilbert |
On-Site Speaker (Planned) |
Duc Nguyen-Manh |
Abstract Scope |
Understanding how the properties of materials change due to nuclear transmutations initiated by exposure to neutrons is a major challenge for the structural components of a fusion power plant. In this study, the multiscale modelling approach based on first-principles calculations has been employed to investigate the co-segregation effect of transmutation-generated solutes in neutron irradiated tungsten over a broad range of Re, Os, Ta and vacancy -defect concentrations. Our Monte-Carlo simulations shows that voids are decorated by Re and Os, but there is no decoration by tantalum (Ta). In the W-Re-Os-Vac system containing 1.5% Re and 0.1% Os, the chemical short-range order parameter between Re-Os is predicted to be negative for the vacancy concentration between 0.05%-0.5%. The modelling results are in an agreement with the APT and STEM experimental observations of transmutation-induced precipitation for both Re and Os in neutron irradiated W exposed at 1200K in High Flux Reactor in Petten. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Modeling and Simulation, High-Temperature Materials |