| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
In Situ SEM Micromechanical Testing to Assess Local Fatigue Properties in Nanostructured Metals |
| Author(s) |
Daniel Kiener, Hannah Lichtenegger, Alexander Jelinek, Markus Alfreider |
| On-Site Speaker (Planned) |
Daniel Kiener |
| Abstract Scope |
Small scale testing approaches allow to conduct fatigue experiments on a local scale, thereby providing assess to factors such as the influence of grain orientation on the fatigue crack behavior or the fatigue threshold, which would be difficult to assess on bulk specimens. Here, we use in situ SEM testing in conjunction with FIB-based specimen fabrication to assess the local fatigue crack growth behavior. Thereby, crack growth is tracked on the one hand from recorded images using machine learning based image analysis, and on the other hand by the continuously recorded sample stiffness. Together, this allows studying e.g. crack stopping events and relate them to the material microstructure. This is demonstrated on two materials with distinct microstructures, electroplated nanocrystalline Ni and drawn nanocrystalline W, respectively. In both cased, emphasis will be placed on the influence of interface structure and chemistry on the resultant fatigue threshold and fatigue crack growth behavior. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, |