About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Transmutation Effects in Materials in Fission, Fusion, and Spallation Environments
|
| Presentation Title |
Effects of Rhenium on Irradiation-Induced Defect Evolution in Tungsten |
| Author(s) |
Yuji Hatano |
| On-Site Speaker (Planned) |
Yuji Hatano |
| Abstract Scope |
Tungsten, the leading plasma-facing material for fusion reactors, will experience simultaneous exposure to deuterium-tritium plasma and 14 MeV neutrons. Neutron irradiation produces vacancy-type defects that trap hydrogen isotopes, while neutron-induced transmutation generates rhenium, potentially altering defect evolution. Here, we investigate the effects of Re on vacancy-type defects and deuterium retention in W-5Re. Heavy-ion and neutron irradiation experiments show that rhenium markedly enhances defect annihilation at irradiation temperatures ≥500 °C, thereby reducing hydrogen isotope retention by orders of magnitude. In contrast, rhenium has little effect on defect recovery during post-irradiation annealing at 800 °C but significantly accelerates recovery at ~1200 °C. These results demonstrate that the beneficial effects of Re depend strongly on whether defect recovery occurs during irradiation or post-irradiation annealing. The mechanisms responsible for these contrasting temperature-dependent behaviors will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Environmental Effects, Energy Conversion and Storage |