| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure and Dynamics of Metallic Glasses
|
| Presentation Title |
Fractal Evolution of Metallic Glass Structure Under High Pressure |
| Author(s) |
Qiaoshi Zeng |
| On-Site Speaker (Planned) |
Qiaoshi Zeng |
| Abstract Scope |
Spatial heterogeneity has been extensively realized as key feature in glasses. So far, in situ probing the evolution of spatial structural heterogeneity of glasses under external stimuli remains challenging. In this talk, we employed the superconducting transition of metallic glasses as a sensitive probe, using high pressure as a powerful parameter to tune structural heterogeneity. With increasing pressure, an intriguing and unexpected “tail” emerges above ~10 GPa in the originally sharp superconducting transition of the resistivity-temperature curve. The weight of this tail grows with pressure but consistently follows a fractal dimension of ~1.37. In situ high-pressure synchrotron x-ray diffraction confirms no phase transition from 0 up to ~100 GPa. Molecular dynamics simulations reveal non-affine atoms percolate above ~10 GPa. These findings reveal an unprecedented heterogeneous response of the glass matrix to high pressure, characterized by obvious fractal characteristics. This suggests the fractal nature of spatial structural heterogeneity of metallic glasses. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Other |