| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2024: Process-Structure-Property Relations and New Technologies
|
| Presentation Title |
Characterizing Dislocations by Formulating the Invisibility Criteria for DFXM |
| Author(s) |
Dayeeta Pal, Yifan Wang, Ramya Gurunathan, Leora Dresselhaus Marais |
| On-Site Speaker (Planned) |
Dayeeta Pal |
| Abstract Scope |
Dislocation motion and long-range interactions are essential to understand a material’s mechanical, electronic and thermal properties, but their dynamics are difficult to measure. While transmission electron microscopy (TEM) has imaged dislocations for half a century, its limited field of view and sample thicknesses may not represent bulk phenomena. To study the “stochastic” dislocation dynamics in bulk crystals, dark field X-ray microscope (DFXM) has been developed. By imaging along an X-ray diffracted beam with an objective lens, DFXM images deep subsurface lattice distortions in crystalline materials. While today’s DFXM can map the dislocation’s line vector, it cannot quantify the Burgers vector required to understand dislocation interactions, structures, and energies. In our work, by revisiting the “invisibility criteria” from TEM theory, we re-solve this formalism and extend it to the ray-optics models developed for DFXM to evaluate how different scans about a single {hkl} diffraction peak encode the Burgers vector within them. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Modeling and Simulation |