Improved twin detection via tracking of individual Kikuchi band intensity of EBSD patterns
Abstract
Twin detection via EBSD can be particularly challenging due to the fine scale of certain twin types – for example, compression and double twins in Mg. Even when a grid of sufficient resolution is chosen to ensure scan points within the twins, the interaction volume of the electron beam often encapsulates a region that contains both the parent grain and the twin, confusing the twin identification process. The degradation of the EBSD pattern results in a lower image quality metric, which has long been used to imply potential twins. However, not all bands within the pattern are degraded equally. This paper exploits the fact that parent and twin lattices share common planes that lead to the quality of the associated bands not degrading; i.e. common planes that exist in both grains lead to bands of consistent intensity for scan points adjacent to twin boundaries. Hence, twin boundaries in a microstructure can be recognized, even when they are associated with thin twins. Proof of concept was performed on known twins in Inconel 600, Tantalum, and Magnesium AZ31. This method was then used to search for undetected twins in a Mg AZ31 structure, revealing nearly double the number of twins compared withmore »
- Authors:
-
- Brigham Young Univ., Provo, UT (United States)
- EDAX Inc., Draper, UT (United States)
- The Ohio State Univ., Columbus, OH (United States)
- Publication Date:
- Research Org.:
- Brigham Young Univ., Provo, UT (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1538888
- Alternate Identifier(s):
- OSTI ID: 1549063
- Grant/Contract Number:
- SC0012587; -SC0012587; 1404771
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Ultramicroscopy
- Additional Journal Information:
- Journal Volume: 185; Journal Issue: C; Journal ID: ISSN 0304-3991
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; Microscopy; EBSD; Twin; Kikuchi band
Citation Formats
Rampton, Travis M., Wright, Stuart I., Miles, Michael P., Homer, Eric R., Wagoner, Robert H., and Fullwood, David T. Improved twin detection via tracking of individual Kikuchi band intensity of EBSD patterns. United States: N. p., 2017.
Web. doi:10.1016/j.ultramic.2017.11.003.
Rampton, Travis M., Wright, Stuart I., Miles, Michael P., Homer, Eric R., Wagoner, Robert H., & Fullwood, David T. Improved twin detection via tracking of individual Kikuchi band intensity of EBSD patterns. United States. https://doi.org/10.1016/j.ultramic.2017.11.003
Rampton, Travis M., Wright, Stuart I., Miles, Michael P., Homer, Eric R., Wagoner, Robert H., and Fullwood, David T. Fri .
"Improved twin detection via tracking of individual Kikuchi band intensity of EBSD patterns". United States. https://doi.org/10.1016/j.ultramic.2017.11.003. https://www.osti.gov/servlets/purl/1538888.
@article{osti_1538888,
title = {Improved twin detection via tracking of individual Kikuchi band intensity of EBSD patterns},
author = {Rampton, Travis M. and Wright, Stuart I. and Miles, Michael P. and Homer, Eric R. and Wagoner, Robert H. and Fullwood, David T.},
abstractNote = {Twin detection via EBSD can be particularly challenging due to the fine scale of certain twin types – for example, compression and double twins in Mg. Even when a grid of sufficient resolution is chosen to ensure scan points within the twins, the interaction volume of the electron beam often encapsulates a region that contains both the parent grain and the twin, confusing the twin identification process. The degradation of the EBSD pattern results in a lower image quality metric, which has long been used to imply potential twins. However, not all bands within the pattern are degraded equally. This paper exploits the fact that parent and twin lattices share common planes that lead to the quality of the associated bands not degrading; i.e. common planes that exist in both grains lead to bands of consistent intensity for scan points adjacent to twin boundaries. Hence, twin boundaries in a microstructure can be recognized, even when they are associated with thin twins. Proof of concept was performed on known twins in Inconel 600, Tantalum, and Magnesium AZ31. This method was then used to search for undetected twins in a Mg AZ31 structure, revealing nearly double the number of twins compared with those initially detected by standard procedures.},
doi = {10.1016/j.ultramic.2017.11.003},
journal = {Ultramicroscopy},
number = C,
volume = 185,
place = {United States},
year = {Fri Nov 10 00:00:00 EST 2017},
month = {Fri Nov 10 00:00:00 EST 2017}
}
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