About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Systems for the Future of Fusion Energy
|
Presentation Title |
Direct Visualization of Tungsten Oxidation by In-situ Environmental TEM |
Author(s) |
Maanas Togaru, Rajat Sainju, Lichun Zhang, Weilin Jiang, Yuanyuan Zhu |
On-Site Speaker (Planned) |
Yuanyuan Zhu |
Abstract Scope |
With a view to air ingress accidents and future DEMO PFM safety, engineering tungsten with enhanced oxidation resistance has attracted increasing attention. Here, in situ environmental TEM (ETEM) was applied, for the first time, to investigate the thermal oxidation of polycrystalline tungsten in real-time. In-situ ETEM captured the genuine tungsten oxide phases and stress states during oxidation. We found that oxide scales are highly sensitive to tungsten surface orientation, and they change dynamically in the course of oxidation. Interestingly, a highly textured oxide scale evolved into a complex layered microstructure and was partially stable even at 900 oC. Novel in-situ ETEM insights hold a great promise for the understanding of nanoscale tungsten oxidation processes, especially the dynamic structural evolutions that affect oxidation rate, pore formation and passivating layer breakdown, to inform the best strategy for responding to accidents, and to guide the tungsten engineering for improved oxidation resistance |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Characterization, Environmental Effects |