About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
High Angular Resolution EBSD From Spherical Harmonic Transform Indexing |
Author(s) |
Gregory E. Sparks, Mark Obstalecki, Paul A. Shade, Michael D. Uchic, Stephen R. Niezgoda, Michael J. Mills |
On-Site Speaker (Planned) |
Gregory E. Sparks |
Abstract Scope |
High-energy diffraction microscopy provides nondestructive 3D data on the local crystalline structure and elastic strains within polycrystalline metals, and can be combined with in-situ mechanical testing to quantitatively characterize microstructure evolution during deformation. However, spatial mapping of the deformation-induced crystal reorientation at and below the scale of subgrains is limited for current HEDM methods. The present project is exploring the use of improved-resolution EBSD, intended to be combined with serial sectioning to produce 3D data reconstructions that can be correlated with HEDM data. This presentation details our efforts to quantify the precision of "spherical harmonic transform indexing," a recently introduced EBSD indexing technique. The best angular resolution found was 0.016°, which approaches the resolution reported in the literature for other high-resolution EBSD implementations. At this resolution, the noise floor for geometrically necessary dislocation density calculations was found to be approximately 7 × 1012 m-2 with a 200 nm step size. |
Proceedings Inclusion? |
Planned: |