About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
|
Symposium
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6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
Quantifying Microscale Drivers for Fatigue Failure via Coupled Synchrotron X-ray Characterization and Simulations |
Author(s) |
Sven E. Gustafson, Wolfgang Ludwig, Paul Shade, Diwakar Naragani, Darren Pagan, Phil Cook, Can Yildirim, Carsten Detlefs, Michael Sangid |
On-Site Speaker (Planned) |
Sven E. Gustafson |
Abstract Scope |
During cyclic loading, localization of intragranular deformation due to crystallographic slip acts as a precursor for crack initiation, often at coherent twin boundaries. A suite of high-resolution synchrotron X-ray characterizations, coupled with a crystal plasticity simulation, was conducted on a polycrystalline nickel-based superalloy microstructure near a parent-twin boundary in order to understand the deformation localization behavior of this critical, 3D microstructural configuration. For the first time, dark-field X-ray microcopy was spatially linked to high energy X-ray diffraction microscopy and X-ray diffraction contrast tomography in order to quantify, with cutting-edge resolution, an intragranular misorientation and high elastic strain gradients near a twin boundary. These observations quantify the extreme sub-grain scale stress gradients present in polycrystalline microstructures, which often lead to fatigue failure. |
Proceedings Inclusion? |
Definite: Other |