About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
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Presentation Title |
Modelling of Re/Os Transmutation Product Segregation in Irradiated W Using Atomistic Kinetic Monte Carlo |
Author(s) |
Matthew James Lloyd, Robert Simpson, Enrique Martinez, Duc Nguyen-Manh |
On-Site Speaker (Planned) |
Duc Nguyen-Manh |
Abstract Scope |
Precipitation of Re and Os transmutation products is a key contributor to thermal/mechanical property degradation in W under neutron irradiation. A combination of nanoscale voids, precipitates and dislocation loops all lead to embrittlement, and an increase in the ductile to brittle transition temperature. Experimental evidence suggests that the respective population of these defects depends strongly on the dose rate, irradiation temperature, transmutation rate and concentration of transmutation products (which depends on the neutron energy spectrum). In this study we investigate the role of different parameters on the segregation of Re and Os in irradiated W using a solute and defect concentration dependant Ising model. Atomistic Kinetic Monte-Carlo (AKMC) simulations have been carried out at different temperatures and dose rates and compared with experimental data obtained using Atom Probe Tomography (APT) of neutron and heavy-ion implanted W. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, High-Temperature Materials, Other |