| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure and Dynamics of Metallic Glasses
|
| Presentation Title |
Enhanced Structural Ordering within Shear Bands of Zr-based Metallic Glasses Probed by 4D-STEM |
| Author(s) |
Minhazul Islam, Gabriel Calderon Ortiz, Birte Riechers, Robert Maaß, Jinwoo Hwang |
| On-Site Speaker (Planned) |
Minhazul Islam |
| Abstract Scope |
Understanding the structure inside shear bands in metallic glasses (MGs) can provide crucial insights into the atomic mechanisms of inhomogeneous deformation and the impact of local atomic arrangements on shear band formation and propagation. Despite valuable transmission electron microscopy (TEM) studies in the past, our understanding still remains incomplete, particularly regarding medium-range ordering (MRO), which has a similar length scale to suggested collective structural shear rearrangement. We employed 4-dimensional scanning TEM (4D-STEM) to examine the shear band structure in Zr-based metallic glasses. Angular correlation and direct MRO mapping from 4D-STEM nanodiffraction data revealed that structures inside shear bands exhibit enhanced 2-fold symmetry, indicating structural changes due to localized flow within a few tens of nanometers. This suggests that post-flow atomic arrangements are more "plane-like," producing stronger diffraction signals and contributing to the enhanced structural symmetry observed. The interpretation and implications of these results will be discussed in this presentation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Other |