| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure and Dynamics of Metallic Glasses
|
| Presentation Title |
Relation between structural and dynamical heterogeneities analyzed by 5 dimensional scanning transmission electron microscopy |
| Author(s) |
Katsuaki Nakazawa, Kazutaka Mitsuishi, Shinji Kohara, Koichi Tsuchiya |
| On-Site Speaker (Planned) |
Katsuaki Nakazawa |
| Abstract Scope |
Although glass is a widely used material in everyday life, many aspects of the glass transition phenomenon remain unexplained, particularly the cause of the rapid increase in viscosity. Dynamic heterogeneity, where atomic motion becomes collective and heterogeneous near the glass transition temperature, is believed to play a crucial role in this rapid increase. Furthermore, the atomic structure of glass is also heterogeneous, comprising both ordered and disordered structures. Despite the expectation that the surrounding structure influences atomic motion, the relationship between these two heterogeneities has not been experimentally verified. The development of scanning transmission electron microscopy (STEM) has resolved this issue. Recent advancements in five-dimensional STEM (5D-STEM) have enabled the acquisition of spatiotemporal distributions of diffraction patterns. By applying 5D-STEM to Zr50Cu40Al10 metallic glass, we simultaneously observed both heterogeneities and found a positive correlation between structural order and relaxation time, indicating that higher structural order leads to slower atomic motion. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, |