| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Composite Materials for Nuclear Applications
|
| Presentation Title |
Coupled Primary and Secondary Recrystallization in Single Tungsten Fiber-reinforced Tungsten Composites |
| Author(s) |
Umberto Maria Ciucani, Lea Haus, Maximilian Fuhr, Hanns Gietl, Johann Riesch, Wolfgang Pantleon |
| On-Site Speaker (Planned) |
Wolfgang Pantleon |
| Abstract Scope |
Tungsten fiber-reinforced tungsten composites with a tungsten matrix reinforced by heavily drawn tungsten fibers are developed for application in future fusion reactors. During their time in service, the microstructure of the highly deformed fibers will unavoidably be altered by recrystallization occurring at the high operation temperatures, causing degradation of the mechanical properties. To investigate the thermal stability of tungsten fiber-reinforced tungsten composites, pure tungsten has been deposited onto single potassium-doped tungsten wires with and without rare earth oxide interlayers. Specimens of single fiber composites were annealed at different temperatures between 1350 °C and 1400 °C for up to four weeks and investigated by means of electron backscatter diffraction. During annealing, the wires start to recrystallize. Without any interlayer, recrystallization nuclei formed in the wire grew into the surrounding matrix and continued growing there. Oxide interlayers prevented such continued growth, although abnormal growth of some grains occurred in the deposited tungsten. |
| Proceedings Inclusion? |
Planned: |