About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Compositional Patterning in Irradiated Polycrystalline Alloys |
Author(s) |
Robert S Averback, Pascal M. Bellon, Qun Li |
On-Site Speaker (Planned) |
Pascal M. Bellon |
Abstract Scope |
Irradiation can induce the self-organization of phase-separating alloy systems into bulk nanoscale compositional patterns (CP) owing to the competition between finite-range ballistic mixing with thermodynamically-driven decomposition. Here we investigate whether CP can also take place at grain boundaries (GBs), or simultaneously in the bulk and at GBs. We address these questions with a multi-order parameter phase-field model for a model polycrystalline phase-separating binary alloy, which includes an irradiation-induced finite-range gaussian mixing. Varying the difference of the heat of mixing between the GB and bulk phases, and the difference between the solute and solvent Gibbs free energies in the GB phase, it is shown that CP at GBs as well as dual CP structure can take place by selecting appropriate alloy compositions and irradiation intensities. We also illustrate that patterning under irradiation can be rationalized by mapping it onto a Swift-Hohenberg free energy with effective, competing atomic interactions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Phase Transformations, Nuclear Materials |