About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Kinetics and Mechanisms Under External Forcing-Driven Conditions
|
| Presentation Title |
Mesoscale models of fluctuations-governed microstructural evolution in alloys: from nucleation and growth to irradiation damage |
| Author(s) |
Jaime Marian |
| On-Site Speaker (Planned) |
Jaime Marian |
| Abstract Scope |
Microstructural evolution in alloys is often driven by fluctuations, even when constant external forces are applied. While atomistic simulation methods can naturally capture these fluctuations, mean-field approaches do not, and fluctuations need to be introduced externally, sometimes in an ad hoc or artificial manner. Due to the time and length scale limitations of atomic-scale simulations, it is desirable to develop robust mesoscale models driven by fluctuations. Here we propose a mean-field framework where fluctuations are furnished by the time integrator itself, independent of the underlying physical model chosen to simulate microstructural evolution. We thus develop a stochastic version of the master equation for clusters dynamics in irradiated systems, and of the Cahn-Hilliard equation to study phase evolution in W-Cr alloys. The solver used to integrate the evolution equations is the residence-time algorithm, which furnishes stochastic realizations of the governing kinetics and gives rise to natural variations of the system's evolution. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Modeling and Simulation, Thin Films and Interfaces |