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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Thermal Stability of Thin Rolled Potassium-doped Tungsten Sheets at Temperatures between 1100 C and 1400 C
Author(s) Ditlev Tarras Madsen, Umberto M Ciucani, Andreas Hoffmann, Wolfgang Pantleon
On-Site Speaker (Planned) Wolfgang Pantleon
Abstract Scope Microstructural changes which occur in plasma-facing tungsten at the high operation temperature in fusion reactors might be prevented by potassium doping. The thermal stability of thin cold-rolled tungsten sheets containing 80 ppm potassium is characterized. Mechanical degradation is quantified by micro hardness testing; microstructure and texture evolution are investigated using electron backscatter diffraction. During annealing, the potassium-doped tungsten sheets undergo extended recovery. No evidence of primary recrystallization is found in the investigated temperature range, but occasionally secondary recrystallization close to the surface. Annealing at the highest temperatures causes a significant loss in hardness during the first two hours, but only smaller changes further on, indicating that recrystallization is impeded through immobilizing high angle boundaries by potassium bubbles. The recovery kinetics for potassium-doped tungsten fits nicely the master curve of recovery obtained on pure tungsten sheets confirming recovery as dominating mechanism occurring unaffected by potassium doping.
Proceedings Inclusion? Planned:
Keywords Characterization, High-Temperature Materials, Nuclear Materials


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