| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Data Science and Analytics for Materials Imaging and Quantification
|
| Presentation Title |
Resolving Pseudosymmetry in Tetragonal ZrO2 Using EBSD with a Modified Dictionary Indexing Approach |
| Author(s) |
Edward L. Pang, Peter M. Larsen, Christopher A. Schuh |
| On-Site Speaker (Planned) |
Edward L. Pang |
| Abstract Scope |
Resolving pseudosymmetry has long presented a challenge for electron backscatter diffraction (EBSD) and has been notoriously challenging in the case of tetragonal ZrO2 in particular. In this work, a method is proposed to resolve pseudosymmetry by building upon the dictionary indexing method and augmenting it with the application of global optimization to fit accurate pattern centers, clustering of the Hough-indexed orientations to focus the dictionary in orientation space, and interpolation to improve the accuracy of the indexed solution. We demonstrate that the proposed method can successfully and efficiently resolve pseudosymmetry in simulated patterns of tetragonal ZrO2 with high degrees of binning and noise as well as experimental datasets. We then explore the effect of crystal orientation and camera distance on the ability to resolve pseudosymmetry using intensity-based indexing approaches. |
| Proceedings Inclusion? |
Planned: |