About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
|
Presentation Title |
Magic Numbers on the Shape of Voids Formed by Electron Irradiation in Aluminium |
Author(s) |
Estelle Meslin, Camille Jacquelin, C.-C. Fu, Maylise Nastar |
On-Site Speaker (Planned) |
Estelle Meslin |
Abstract Scope |
In-situ irradiation effects in aluminium, a low-mass material allowing the direct formation of defects by electron irradiation within an HRTEM, will be presented. We obtained a strong effect of hydrogen partial pressure on the kinetics of formation of cavities and dislocation loops and developed a multi-scale modeling of the effects of finite size and network discretization on DFT based-equilibrium shapes of cavities. Measurements of cavity shape dispersion during its growth and shrinkage showed a dominant effet of magic numbers, fixed by geometry and network frustration. Based on a thermodynamic model and a fine experimental characterization of the density and the size distribution of the cavities, we propose a nucleation model of cavities under irradiation. Finally, we discuss the effect of hydrogen on the stability of vacancy-hydrogen clusters and on the kinetic of cavity nucleation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Characterization, Modeling and Simulation |