About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
The Application of Digital Image Correlation to In Situ TEM Deformation Investigations |
Author(s) |
Gregory B. Thompson, Accalia Robinson, Thomas Koenig , Alicia Koenig , Eric Homer |
On-Site Speaker (Planned) |
Gregory B. Thompson |
Abstract Scope |
Digital image correlation (DIC) is a method by which strain is measured during an evolving loading experiment by tracking a change in contrast from pixel-to-pixel. This is traditionally achieved through some type of speckle pattern contrast overlaid onto the surface of the sample with either optical or SEM imaging capturing the time-lapse images. DIC has been limitedly applied in its use in the TEM because of inherent complexities associated with its Bragg contrast. Nevertheless, this TEM contrast is directly associated with the deformation mechanisms themselves, with such contrast evolving through the course of in situ loading. In this talk, the use of DIC to data mine images will be addressed as well as the image processing that brings DIC and far field strain measurements into agreement. Several examples of dislocation evolution in a nanocrystalline sample are reported confirming how larger grains as compared to smaller grains experience higher strains. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, |