About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Kinetics and Mechanisms Under External Forcing-Driven Conditions
|
| Presentation Title |
Extending the concept of defect-phase to driven systems: Opportunities and Challenges |
| Author(s) |
Pascal M. Bellon, Robert S Averback, Marie A. Charpagne, Yen-Ting Chang, Nicholas Saunders, Amit Verma, Sourav Das |
| On-Site Speaker (Planned) |
Pascal M. Bellon |
| Abstract Scope |
The concept of metastable defect-phase has been recently introduced to capture the effect of a high density of structural defects such as grain boundaries and dislocations on alloy phase stability. During processing and in service, however, defects may be continuously created and eliminated, e.g., point defects during irradiation and dislocations during plastic deformation, and chemical species may undergo forced mixing. These dynamical systems often reach steady states that self-organize into nanoscale patterns. It is proposed to describe the resulting microstructures using the concept of driven defect-phase, embodied in the coupled kinetic evolutions of structural defects and chemistry. This approach makes it possible to design alloys with high processability and in-service performance. Key challenges reside in quantifying the underlying defect-chemistry kinetic couplings and in assessing the stability of the resulting driven microstructures, for instance, using non-equilibrium free energies. These opportunities and challenges are illustrated from recent works in the field. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Nuclear Materials, Shaping and Forming |