About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Powder Materials Processing and Fundamental Understanding
|
Presentation Title |
Mechano-Chemical Competition 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 (MD-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 the melting point. Previous research has examined the competition between thermal and mechanical driving forces in the mixing of binary systems with positive mixing enthalpies. However, the mixing physics of multiple elements with negative mixing enthalpies remained unclear. We combine mechanical alloying methods, XRD and SEM characterization, and kinetic Monte Carlo simulation to investigate the competition between chemical and mechanical forces in the mixing of ternary CCAs with negative mixing enthalpies. We define three mixing mechanisms and their corresponding steady-state phases. Based on simulated phase and free energy diagrams, we reveal the energetics behind the competition of driving forces as the interplay between mixing enthalpy and configurational entropy. Lastly, we propose a theoretical phase prediction map for alloy design. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Modeling and Simulation, Phase Transformations |