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Electron backscattered diffraction as a tool to quantify subgrains in deformed calcite.

S L A Valcke¹, G M Pennock, M R Drury

¹Faculty of Geosciences, Utrecht University, PO Box 80.021, 3508 TA Utrecht, The Netherlands. valcke@geo.uu.nl

Journal of Microscopy

|January 11, 2007

Summary

We evaluated methods for determining subgrain sizes from electron backscattered diffraction data in deformed calcite. The measured linear intercept hierarchy method provides more representative microstructural results than other techniques.

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Area of Science:

Geology
Materials Science
Crystallography

Background:

Electron backscattered diffraction (EBSD) is crucial for analyzing material microstructures.
Determining subgrain sizes from EBSD data requires robust processing methods.
Previous methods like the domain boundary hierarchy have limitations.

Purpose of the Study:

To investigate and compare methods for obtaining subgrain sizes from EBSD data.
To address limitations of the domain boundary hierarchy method.
To identify reliable methods for analyzing deformed calcite microstructures.

Main Methods:

Applied the domain boundary hierarchy method to calcite samples.
Tested the measured linear intercept hierarchy method.
Tested the calculated linear intercept hierarchy method.

Main Results:

The domain boundary hierarchy method showed limitations including topological issues, undersampling, and artefacts.
The measured linear intercept hierarchy method yielded more representative microstructural results compared to the calculated method.
The calculated linear intercept hierarchy method exhibited significant uncertainty due to its grid-based nature.

Conclusions:

The measured linear intercept hierarchy method is a more reliable approach for subgrain size analysis from EBSD data.
This method shows potential for correlating subgrain size with deformation conditions (stress, strain, temperature) in calcite.
Further research is needed to fully understand the relationship between the measured linear intercept hierarchy method and deformation processes.