About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Presentation Title |
Grain Evolution in Tungsten Under Isothermal Annealing |
| Author(s) |
Tsu-Chun Teng, Sudipta Biswas, Priyanshi Agrawal, Stephanie Pitts |
| On-Site Speaker (Planned) |
Sudipta Biswas |
| Abstract Scope |
Tungsten is considered one of the best candidates for plasma-facing materials in fusion reactors due to its exceptionally high melting point, strong thermal conductivity, and resistance to sputtering. However, its long-term performance depends on its microstructure evolution under sustained high-temperature conditions. Here, we present grain growth in polycrystalline tungsten during isothermal annealing conditions, a process relevant to long-term thermal exposure. To capture this behavior, we developed a phase-field model for tungsten to simulate the curvature-driven grain evolution. The model accounts for grain-boundary energy and temperature-dependent grain-boundary mobility to capture realistic material responses. Simulations were carried out across a temperature range from 523 K to 1773 K, allowing us to explore how temperature influences grain coarsening, refinement, and overall grain size distribution. The model findings are compared against isothermal annealing experiments of pure tungsten performed at INL. This work provides valuable insight into tungsten’s microstructural stability under fusion-relevant conditions. |
| Proceedings Inclusion? |
Undecided |