About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Materials Systems for the Future of Fusion Energy
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Presentation Title |
In-situ TEM of Quantum De-trapping and Transport of SIA Clusters in Tungsten |
Author(s) |
Kazuto Arakawa |
On-Site Speaker (Planned) |
Kazuto Arakawa |
Abstract Scope |
To precisely predict the lifetime of nuclear-fusion materials, accurate understanding of the dynamic properties of radiation-produced defects is required.
Defects are unavoidably bound to static trapping centres such as impurity atoms, meaning that their diffusion is dominated by de-trapping processes. We successfully monitored the de-trapping and migration of nanoscale SIA clusters in the form of dislocation loops, strongly trapped by impurity atoms in tungsten, by triggering de-trapping out of equilibrium at cryogenic temperatures, using high-energy electron irradiation and in-situ transmission electron microscopy [1]. We reveal the quantum de-trapping of defects below around 1/3 of the Debye temperature, in contrast to a traditional notion that de-trapping occurs only by thermal activation. In the presentation, we also show the impacts of this intrinsically high mobility of the dislocation loops in the microstructural evolution upon irradiation.
[1] K. Arakawa et al., Nature Mater. 19 (2020) 508. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, High-Temperature Materials, Modeling and Simulation |