About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Local Chemical Ordering and Its Impact on Mechanical Behaviors, Radiation Damage, and Corrosion
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| Presentation Title |
Correlative 4D-STEM Mapping of Shear Band Evolution and Structural Heterogeneity in Metallic Glasses |
| Author(s) |
Di Wang, Sangjun Kang, Xiaoke Mu, Christian Kuebel |
| On-Site Speaker (Planned) |
Christian Kuebel |
| Abstract Scope |
We developed Lorentz 4D scanning transmission electron microscopy for simultaneous mapping of magnetic structure, strain, and atomic packing in glasses. The method enables spatially resolved analysis of local density fluctuations, strain heterogeneity, and short- to medium-range order. [1–2] We applied this to visualize the structure of shear bands in glasses at different relaxation states: as-quenched samples exhibit dense, branched networks and extended shear-band-affected zones, while relaxed glasses show more localized deformation. At shear band intersections, quadrupolar strain fields and local dilatation reveal signatures of cooperative shear transformation zones. [3] In high-pressure torsion processed glasses, heterogeneous defect networks scatter subsequent deformation, promoting delocalized plastic flow. 4D-STEM provides direct insight into how nanoscale heterogeneity, STZ activation, and processing history govern the mechanical response and ductility of metallic glasses.
1. Kang et al., Acta Mat. (2024), 119495
2. Kang et al., Nature Comm. (2025)1305
3. Kang et al., Adv. Mat. (2023) 2212086 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Magnetic Materials, Mechanical Properties |