| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Oxidation Mechanism Transitions in Tungsten Driven by Scale Cracking |
| Author(s) |
Samuel A. Humphry-Baker, Dora Nagy, Yusha Lin, James Davidson, Sercan Cetinkaya, Vanessa Peterson, Edward Obbard, Kevin Laws, Patrick Burr |
| On-Site Speaker (Planned) |
Samuel A. Humphry-Baker |
| Abstract Scope |
Tungsten based materials may be exposed to high temperature air or steam in fusion reactor accident scenarios. This would cause extensive oxidation and the attendant release of hazardous transmutation products into the environment. For tungsten, crack formation causes a transition from protective, parabolic oxidation kinetics towards unprotective, linear kinetics. Cracking is driven by the density mismatch between the oxide and substrate. In this presentation we demonstrate the implications of this phenomenon for metallic tungsten and tungsten borides, which are candidates for the first wall and neutron shielding. We report measurements of the cracking-related transition in oxidation kinetics using in-situ neutron diffraction studies coupled with ex-situ thermogravimetric analysis. We show our development of oxidation mechanism maps, which allow mechanistic predictions to be made as a function of time and temperature. Plans to optimise the materials for enhanced oxidation resistance will be described. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, High-Temperature Materials, Nuclear Materials |