| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
A Phase Field Modeling Study on Coupling of Compositional Patterning with Evolution of Grain Boundaries in Irradiated Binary Immiscible Alloys |
| Author(s) |
Qun Li, Pascal Bellon, Robert S Averback |
| On-Site Speaker (Planned) |
Qun Li |
| Abstract Scope |
Prior experimental and simulation results have shown that finite-range ballistic mixing by ion irradiation can induce compositional patterning in immiscible alloys, resulting in finite and stable nanoprecipitate sizes. Some experimental results suggest that patterning can simultaneously take place along grain boundaries (GBs) and within grain interiors. Here we use phase field modeling to investigate the conditions required for these two types of patterning to coexist. We introduce a new real-space expansion of a Gaussian mixing model to study the effect of the characteristic ballistic mixing range R and apply this mixing model to a bicrystal using the “Abdeljawad-Foiles” approach. For small R, close to the onset of patterning, GB patterning is found to suppress patterning at the grain interior. For large values of R, however, both patterns can be present, but with larger precipitates at GBs. An extended steady-state phase diagram is proposed to rationalize these results. |
| Proceedings Inclusion? |
Planned: |