About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Effective Temperature Concept for Steady States in Driven Alloy Systems |
Author(s) |
Pascal M. Bellon, Robert S Averback, Sourav Das |
On-Site Speaker (Planned) |
Pascal M. Bellon |
Abstract Scope |
Alloys driven by external forcing such as irradiation and plastic deformation are often observed to reach steady states. In the case of immiscible elements, the resulting steady-state solubility measured in experiments can be rationalized by an effective temperature, which is a measure of the configurational entropy of steady-state microstructures. At low physical temperature, irradiation and deformation stabilize solid solutions and this effective temperature is thus infinite. In high immiscible and highly reactive systems, however, irradiation and severe plastic deformation are found to trigger decomposition even at physical temperatures so low that thermal activated migration of point defects and solute is suppressed. Using atomistic modeling it is shown that a finite effective temperature, designated as the process temperature, can be introduced to capture such decomposition reactions at low physical temperatures. A parallel is made with the effective temperature introduced in the thermodynamic dislocation theory for steady-state dislocation density in deformed crystals. |
Proceedings Inclusion? |
Planned: |