| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Meeting Materials Challenges for the Future of Fusion Energy
|
| Presentation Title |
Annealing of Neutron Irradiated Tungsten to Assess the Stability of Irradiation Induced Transmutant Solute Clusters |
| Author(s) |
Kieran Rivers, Andrew London, Michael Moody, Paul Bagot, David Armstrong |
| On-Site Speaker (Planned) |
Kieran Rivers |
| Abstract Scope |
Tungsten is the main candidate for fusion reactor plasma facing components. Neutron irradiation of tungsten causes transmutation to rhenium and osmium. These transmutation products form irradiation induced clusters in the material which are not predicted to be stable according to equilibrium phase diagrams. Pure tungsten samples were neutron irradiated in a fission reactor at 900°C and have a final composition representing approximately one full power year of commercial fusion reactor transmutation products. These samples have been annealed at 900°C, 1200°C and 1500°C for different durations to assess the stability of the clusters. Atom probe tomography, XRD and TEM have been used to show how the composition profile and size of the clusters vary with annealing temperature and duration. Clusters after the 1200°C anneal start to show a significant change in the osmium content at their centres. Nanoindentation correlates with this to show a decrease in hardness after the 1200°C anneal. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Other, Other |