About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
3D Maps of Geometrically Necessary Dislocations in Shock-loaded Polycrystalline Tantalum |
Author(s) |
Wyatt A. Witzen, Toby Francis, Tresa M. Pollock, Irene J. Beyerlein |
On-Site Speaker (Planned) |
Wyatt A. Witzen |
Abstract Scope |
TriBeam Tomography has the unique capability of employing Three-Dimensional Electron Backscatter Diffraction (3D EBSD) to map the orientation of grains in 3D space. This intragranular resolution of orientation permits the ability to calculate Geometrically Necessary Dislocations (GNDs) and map these as dislocation densities in 3D space. A sample of polycrystalline BCC Tantalum was shock-loaded in a flyer plate impact test and subjected to this analysis to map dislocation networks present in the material after dynamic deformation. The calculated GND densities revealed dislocation networks associated with multiple subgranular features, including voids and subboundaries. Densities on the order of 1 × 10 <sup>15</sup> m <sup>-2</sup> were associated with some of these features, including voids lying at the grain boundaries and within the interior of the grains themselves. GND densities associated with the {110}, {112}, and {123} slip families were compared when calculating the total GND densities mapped in the microstructure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Other |