About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Symmetry Considerations for Ordering in High-entropy Alloys
|
| Author(s) |
Flynn Walsh, Robert O. Ritchie, Mark Asta |
| On-Site Speaker (Planned) |
Flynn Walsh |
| Abstract Scope |
The formation of local chemical order in high-entropy alloys is examined from the perspective of the mean-field static concentration wave formalism. Motivating the approach, existing theory for binary alloys is used to explain experimental observations regarding the pseudo-binary ordering of the CrCoNi medium-entropy alloy. In particular, an effort is made to distinguish among the the types of chemical order that give rise to diffuse intensities in diffraction experiments, i.e. incipient long-range order, short-range order representable by continuously forming concentration waves, and nominally unfavorable ordering motifs arising from geometric considerations. The theory is then more rigorously extended to many-component alloys and applied to well studied systems, including the fcc Cantor alloy and bcc refractory high-entropy alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, High-Entropy Alloys, Computational Materials Science & Engineering |