Abstract
Lattice orientation data often are available at a collection of locations within a grain, and an average of these lattice orientations is useful in data analysis. We define an average orientation based on misorientation angles, which leads to a nonlinear least-squares problem that may be solved numerically. This average orientation then serves as the basis for several related quantities that characterize the misorientation structure within a grain. The spread of a grain in (mis)orientation space is determined, as is a spatial correlation of the misorientation parameters. The method is applied to experimental data from electron backscattered diffraction (EBSD) scans and to simulation data from finite-element analyses of the deformation of a polycrystal. The quantities characterizing the grain substructure are found to evolve with strain and to illuminate trends in the microstructural evolution.
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Barton, N.R., Dawson, P.R. A methodology for determining average lattice orientation and its application to the characterization of grain substructure. Metall Mater Trans A 32, 1967–1975 (2001). https://doi.org/10.1007/s11661-001-0009-x
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DOI: https://doi.org/10.1007/s11661-001-0009-x