About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
|
Presentation Title |
Characterizing Local Order in Disordered Materials |
Author(s) |
Shuoyuan Huang, Carter Francis, Paul Voyles |
On-Site Speaker (Planned) |
Paul Voyles |
Abstract Scope |
Discerning local order in disordered materials poses a substantial challenge in materials science. In experiments, electron nanodiffraction in the form of 4D STEM is a useful tool. A nanometer-diameter electron probe can obtain diffraction from as one hundred atoms, which is sensitive to ordered structures in glasses and orientation and strain in crystals. STEM scanning can produce spatial maps of these quantities. We have developed a new method to identify rotational symmetries in electron nanodiffraction patterns from metallic glasses with reduced artifacts compared to previous approaches. The degree of rotational symmetry and the density of symmetric structures in the glass is correlated to the glass thermal stability and hardness. We have also developed methods generalized from 2D image processing into 4D to find “important” features in large, complex, 4D STEM data sets. These features can be used to find strongly diffracting clusters in glasses or for orientation imaging in crystals. |
Proceedings Inclusion? |
Planned: |