| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
|
| Presentation Title |
Nanomechanical Change of Tungsten in ELM Conditions |
| Author(s) |
Minsuk Seo, Leigh Winfrey |
| On-Site Speaker (Planned) |
Minsuk Seo |
| Abstract Scope |
Edge Localized Modes (ELMs) are one of the great concerns in the nuclear fusion reactor operation because of the heat loads of 1-10GW/m2 with microsecond pulsed plasma would thermally damage the plasma facing materials the brittle tungsten. Tungsten samples exposed to 12.5, 22.8, and 46.3GW/m2 heat flux were evaluated using nanonindentation to evaluate the nanomechanical behaviors in extreme environments. The results showed that the plasma peening like hardening effects appeared near the plasma contacting regions. Helium implantation may not be involved in the hardening because of the limited stopping range. However, a higher heat load softens the matrix due to the high temperature annealing as recovery temperature is easily achievable. Describing the competition of two factors in different heat loads along the depth dimension is important since the mass ablation of tungsten of lifetime relies on mechanical properties. |