About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Theory and Design of Metallic Glasses
|
| Presentation Title |
Medium-Range Atomic Correlation in Metallic Liquids |
| Author(s) |
Chae Woo Ryu, Takeshi Egami |
| On-Site Speaker (Planned) |
Chae Woo Ryu |
| Abstract Scope |
The α-relaxation time, τα, typically extracted from the decay of the intermediate scattering function F(Q, t) at the first peak of the structure factor, is widely used to characterize structural relaxation in liquids. While it is often attributed to atomic caging effects arising from short-range order (SRO), its microscopic origin remains unclear. In this study, we analyze the Van Hove correlation function G(r, t) to elucidate the spatial characteristics of atomic relaxation. Our results reveal that τα reflects not only the dynamics of SRO but also those of medium-range order (MRO), with a predominant contribution from the decay of MRO-related correlations. The distinct temporal evolution of G(r, t) and F(Q, t) indicates that τα originates from cooperative atomic motion extending beyond the nearest neighbors. These findings redefine the physical interpretation of α-relaxation and underscore the critical role of medium-range structural correlations in governing the dynamics of supercooled liquids and in interpreting scattering-based relaxation measurements. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Computational Materials Science & Engineering, Phase Transformations |