About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Systems for the Future of Fusion Energy
|
Presentation Title |
N-24: Microstructure Deformation and Possible Densification of Tungsten in High Heat Flux Conditions |
Author(s) |
Minsuk Seo, Ke Wang, John R. Echols, Leigh Winfrey |
On-Site Speaker (Planned) |
Minsuk Seo |
Abstract Scope |
Tungsten is a candidate material for the divertor component in future tokamak reactors. However, high heat flux during disturbances (1-10GW/m2) can melt the surface and cause severe surface damage. In this study, high heat fluxes (12.5-46.3GW/m2) were applied using electrothermal plasma to simulate and investigate surface damage. TEM microphotographs showed porous resolidification and highly deformed microstructures. A total of 16 nanoindentations were taken from the matrix to get an average nanohardness. Dislocation density is estimated to be ~1016/m2. The hardening and possible densification are due to the high dislocation density environment. Due to the FIB process, Ga-focused ion beam induced amorphous artifacts formed at the pores. The pores are likely formed from the stress concentration as dislocations increased from as machined to ~1017/m2. We suggest that ductile fracture occurred at the pore during the high heat event. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Characterization, High-Temperature Materials |