| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure and Dynamics of Metallic Glasses
|
| Presentation Title |
Spatial heterogeneities in metallic glass: identifying the origins beyond the 100 nm length scale |
| Author(s) |
Reza Rashidi, Birte Riechers, Robert Maass |
| On-Site Speaker (Planned) |
Reza Rashidi |
| Abstract Scope |
Metallic glasses exhibit structural and temporal heterogeneities across a wide spectrum of time and length scales. In concert with atomistic simulations, spatially varying dynamic and structural fluctuations can be well rationalized at the nanometer scale. Here we focus on the large length scale part of property variations and the continued search for its underlying origin. Previously we proposed that cooling constraints during solidification may give rise to elastic heterogeneities at the 100 nm length scale (Materials & Design 229 (2023) 111929). Sampling across various casting geometries and thermal histories we in this talk substantiate this proposition via the tracking of elastic decorrelation lengths that depend on sample size and position within the glass. Thermal annealing is shown to reduce decorrelation length-scale gradients and the magnitude of moduli fluctuations. We further leverage scanning nanobeam diffraction to match the elastic microstructure probed nanomechanically with structural information derived from spatially resolved diffraction mapping. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Solidification |