About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
On the Nature of Chemical Short-Range Order Evolution |
| Author(s) |
Guilherme Cardeal Stumpf, Yifan Cao, Vinícius Bacurau, Daniel Miracle, Witor Wolf, Edgar Zanotto, Rodrigo Freitas, Francisco Coury |
| On-Site Speaker (Planned) |
Guilherme Cardeal Stumpf |
| Abstract Scope |
Chemical short-range order (CSRO) is essential to understanding phase stability in HEAs, yet its fundamental nature remains unresolved. Here we show that it evolves as a kinetic arrest phenomenon, not as a classical thermodynamic transition. We used in situ dilatometry with synchrotron X-ray diffraction on the model CrCoNi alloy within a rigorous thermal protocol with multiple cycles to characterize different CSRO states. The data were combined with atomistic simulations using a state-of-the-art machine-learning interatomic potential tuned for CSRO detection, allowing in situ quantification of the CSRO order parameter. The observations indicate the rate-dependent and non-discontinuous character of the kinetic arrest, akin to a glass transition. A complete framework was proposed and subsequently used to clarify the role of CSRO in structural contraction down to individual bonds in CrCoNi. It also establishes a simple method to characterize CSRO in a range of alloys, which we applied to Inconel and stainless steel. |
| Proceedings Inclusion? |
Undecided |