About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Thermodynamic nature of the local chemical ordering phenomenon |
| Author(s) |
Guilherme Cardeal Stumpf, Yifan Cao, Vinicius Bacurau, Daniel Miracle, Witor Wolf, Edgar Zanotto, Rodrigo Freitas, Francisco Gil Coury |
| On-Site Speaker (Planned) |
Guilherme Cardeal Stumpf |
| Abstract Scope |
Local chemical ordering (LCO) refers to the non-random arrangement of atoms in solid solutions driven by chemical affinities at short range. This phenomenon has been increasingly recognized as a key factor influencing the properties of alloys, particularly medium- and high-entropy alloys, due to their complex compositions. Recent efforts have focused not only on elucidating LCO’s effects on material properties but on advancing detection methods and computational modeling. Yet, the fundamental nature of LCO remains poorly understood. To address this, we investigated the phenomenon in light of phase transition theory by combining state-of-the-art atomistic simulations and structural information obtained from in-situ synchrotron dilatometry. Our methods enabled full modeling of the experiment, including the calculation of the in-situ order parameter and the decoupling of LCO’s contributions to lattice expansion. We show that the evolution of LCO is not a classical thermodynamic transition, but rather a kinetic phenomenon. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, |