Resolving pseudosymmetry in γ-TiAl using cross-correlation electron backscatter diffraction with dynamically simulated reference patterns

Jackson, Brian; Fullwood, David; Christensen, Jordan; Wright, Stuart

doi:10.1107/s1600576718003849

Resolving pseudosymmetry in γ-TiAl using cross-correlation electron backscatter diffraction with dynamically simulated reference patterns

Journal Article · Fri Apr 13 00:00:00 EDT 2018 · Journal of Applied Crystallography (Online)

DOI:https://doi.org/10.1107/s1600576718003849· OSTI ID:1541441

Jackson, Brian ^[1]; Fullwood, David ^[2]; Christensen, Jordan ^[2]; Wright, Stuart ^[3]

Brigham Young University, Provo, UT (United States); Brigham Young University
Brigham Young University, Provo, UT (United States)
EDAX/TSL, Draper, UT (United States)

Pseudosymmetry is a phenomenon that occurs when grains with different lattice parameters produce nearly identical diffraction patterns such that conventional electron backscatter diffraction (EBSD) techniques are unable to unambiguously differentiate the lattice orientations. This commonly occurs in materials with near-unity tetragonality, such as γ-TiAl. The current study uses cross-correlation EBSD to resolve pseudosymmetry in γ-TiAl. Three dynamically simulated reference patterns are generated for each point in the scan, one for each of the three potential pseudosymmetric orientations, which are subsequently correlated with the original pattern using six different methods in order to identify the correct orientation. The methods are first applied to a scan of dynamically simulated patterns, which is used to evaluate the sensitivity of the method to pattern resolution, pattern noise and pattern center error. It was determined that all six methods were 100% successful up to about 13 µm of pattern center error and pattern resolutions of about 80 × 80 pixels, and hence the methods were applied to an experimental sample of lamellar γ-TiAl. A hybrid combination of two of the methods was shown to successfully select the correct pseudosymmetry for about 96% of the points in the scan, improving upon the 70% accuracy of the Hough-based methods for the current study and 90% accuracy for previous studies resolving pseudosymmetry in lamellar γ-TiAl.

View Accepted Manuscript (DOE)

Research Organization:: Brigham Young University, Provo, UT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012587

OSTI ID:: 1541441

Journal Information:: Journal of Applied Crystallography (Online), Journal Name: Journal of Applied Crystallography (Online) Journal Issue: 3 Vol. 51; ISSN 1600-5767; ISSN JACGAR

Publisher:: International Union of CrystallographyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Resolving pseudosymmetry in γ-TiAl using cross-correlation electron backscatter diffraction with dynamically simulated reference patterns

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