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 |
A High-fidelity Analytical Model for Multi-peak Bragg Coherent Diffraction Imaging of Compact Crystalline Domains |
Author(s) |
Siddharth Maddali, Stephan Hruszkewycz |
On-Site Speaker (Planned) |
Siddharth Maddali |
Abstract Scope |
Fourth-generation synchrotrons now present the opportunity to track and study individual grains using Bragg coherent diffraction imaging (BCDI), image the crystallographic context and grain neighbor influences, by unifying BCDI with high-energy diffraction microscopy (HEDM) and diffraction contrast microscopy (DCT). Here I present a long-envisioned BCDI capability enabled by this unification: spatially resolved strain tensor reconstruction in individual grains by coupling independent BCDI datasets. I present an analytical diffraction model for BCDI reconstruction of lattice deformation, specially tailored to structural kinks with complex topologies (defects, dislocations). These are difficult to reconstruct with traditional phase retrieval. I will demonstrate the modeling of these features in the coherent diffraction imaging process using Fourier transform methods, which protects them from undesirable point-spread effects, preserving fidelity to the original structure in digital reconstructions. I will demonstrate how the spatial resolution of the reconstruction greatly benefits from coupling individual BCDI datasets within the forward model itself. |
Proceedings Inclusion? |
Definite: Other |