| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
|
| Presentation Title |
Phase Field Modeling of the Coupling between Compositional Patterning and Radiation Induced Precipitation at Grain Boundaries and Dislocation Loops in Immiscible Binary Alloys during Irradiation |
| Author(s) |
Gabriel Franck Bouobda Moladje, Robert S Averback, Pascal Bellon |
| On-Site Speaker (Planned) |
Gabriel Franck Bouobda Moladje |
| Abstract Scope |
Modeling and experiments have established that the chemical mixing forced by irradiation can induce self-organization in immiscible alloys, with steady-state compositional patterns comprised of intragranular nanoprecipitates. This self-organization, however, can be destabilized by the loss of solute to sinks such as grain boundaries (GBs) and dislocation loops owing to solute drag by point defects. A new phase field model is introduced to investigate the competition between these phenomena under irradiation. Low angle GBs are modeled as dislocation arrays. Point defects migration, which is biased by the sink strain fields, can lead to solute drag depending upon the sign and amplitude of solute-point defect interactions. Using parameters for dilute Al alloys, e.g., Al-Sb, it is found that irradiation-induced patterning at GBs and loops can co-exist with intraganular patterning. This global patterning may be beneficial for radiation tolerance. The results are compared to recent experiments on these alloys. |
| Proceedings Inclusion? |
Planned: |