|About this Abstract
||MS&T21: Materials Science & Technology
||Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments
||Real-time Thermal Oxidation Process of PFM Tungsten Under Fusion-relevant Conditions Revealed by In-situ Environmental TEM
||Maanas Togaru, Rajat Sainju, Lichun Zhang, Weilin Jiang, Yuanyuan Zhu
|On-Site Speaker (Planned)
Tungsten has been selected as the plasma-facing divertor material at the ITER. With a view to transient events, air ingress accidents and future DEMO PFM safety, engineering tungsten with enhanced oxidation resistance and mechanical performance including ductility and DBTT has attracted increasing attention in the fusion community. However, significant knowledge gaps exist in the understanding of the oxidation mechanism and kinetics of tungsten and associated alloys, and how passivating elements conflict and/or compromise the mechanical properties. In this talk, we will demonstrate how a novel MEMS-based in-situ environmental TEM, capable of mimicking the air ingress, can be utilized to directly observe the evolution of scale phases and elucidate the mechanisms underpinning the oxidation onset and kinetics. New insights into the irradiation-assisted tungsten and tungsten alloy oxidation hold a great promise for reinforcing design criteria that balance mechanical properties with oxidation resistance for the development of next-generation tungsten-based PFMs.