About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Theory and Design of Metallic Glasses
|
| Presentation Title |
Probing Deformation in Metallic Glasses With 4D-STEM |
| Author(s) |
Zhiyu Zhang, Kun Luo, Qi An, Yang Yang |
| On-Site Speaker (Planned) |
Zhiyu Zhang |
| Abstract Scope |
Understanding deformation mechanisms in metallic glasses remains a critical challenge due to their amorphous atomic structure and absence of long-range order, which limits the applicability of conventional crystallographic analysis techniques. In this work, we present an advanced characterization framework that combines in-situ nanomechanical testing with four-dimensional scanning transmission electron microscopy (4D-STEM) to quantify deformation at the nanoscale. By collecting nanobeam electron diffraction (NBED) patterns at each two-dimensional scan position throughout various loading stages up to fracture, we can generate nanometer-scale spatial resolution strain maps of the metallic glass under different loading conditions. By integrating experimental results with molecular dynamics (MD)simulations, we explore the origin of strain heterogeneity evolution in Zr-Cu-Al-based metallic glass thin films during mechanical deformation. Our results demonstrate that the strain measured by 4D-STEM not only serves as a critical indicator of the elastic response but also provides key insights into the evolution of local short-range order. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Modeling and Simulation, |