About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Kinetics and Mechanisms Under External Forcing-Driven Conditions
|
| Presentation Title |
Mechano-Chemical Effect in Mechanically Driven Complex Concentrated Alloys |
| Author(s) |
Luyan Li, Yuan Yao, Mostafa Hassani |
| On-Site Speaker (Planned) |
Luyan Li |
| Abstract Scope |
Mechanically driven complex concentrated alloys (CCAs) can be formed by three or more types of elemental powders mixing into a solid solution through severe plastic deformation at temperatures much lower than melting point. We combined mechanical alloying methods, XRD and SEM characterization, and kinetic Monte Carlo simulations to study the role of chemical and mechanical forces in the mixing of ternary CCAs with negative mixing enthalpies. We define three representative mixing mechanisms and their corresponding steady-state phases. With simulated phase and energy diagrams, we reveal the energetics behind the competition of driving forces as the interplay between mixing enthalpy and configurational entropy. We further demonstrate that, under cryogenic temperature, chemical driving force is constrained due to suppressed thermal diffusion, while mechanical mixing barrier due to hardness mismatch among elements becomes severe. Based on mixing enthalpy, hardness mismatch and temperature, we propose a theoretical phase prediction map for alloy design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Modeling and Simulation, Phase Transformations |