About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Theory and Design of Metallic Glasses
|
| Presentation Title |
E-35: Investigating Structural Dynamics and Evolution Pathway in Metallic Glasses Using In Situ 4D-STEM |
| Author(s) |
Md Minhazul Islam, Sang-Chul Lee, Muchen Wang, Yue Fan, Yunzhi Wang, Hee-Suk Chung, Jinwoo Hwang |
| On-Site Speaker (Planned) |
Md Minhazul Islam |
| Abstract Scope |
We use in situ 4D-STEM to study the evolution and dynamics of Zr-based metallic glasses. Our investigation reveals that compositional variations within these glasses can lead to substantial differences in structural homogeneity, which also connects to the proposed concept of ideal glass structure. Through in situ sub-Tg annealing, we show the structural relaxation pathways of these glasses and how they differ depending on the degree of structural heterogeneity, defined by the population of crystalline-like medium-range orders. We also track the dynamics of metallic glasses through the evolution of 4D-STEM diffraction patterns, an approach similar to electron correlated microscopy, to understand how structurally homogeneous and heterogeneous glasses differ in local atomic dynamics. This information is then connected to atomistic and mesoscale simulations to explain how more homogeneous structures lead to higher ductility, a trend confirmed through this work. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, |