Whether EBSD planar sections without preferred grain orientation are off-center cuts

Determine whether electron backscatter diffraction (EBSD) planar sections that exhibit no preferred morphological grain orientation correspond to planar sections located farther away from the particle center, thereby indicating that the assumption that the particle center coincides with the origin of the EBSD planar section is invalid for those images.

Background

In the analysis of 2D EBSD planar sections, the authors quantify morphological grain orientation using principal components and observe that many sections show a clear preferred orientation toward the particle center. However, a subset of EBSD images exhibits no preferred orientation, which they suspect may be due to those sections not passing through the particle center.

Because the stereological GAN-based fitting procedure for the 3D grain architecture model relies on planar sections through the particle center to capture grains at all radial distances, EBSD planar sections believed to be off-center were excluded from model calibration. Confirming whether the orientation-less sections are indeed off-center would validate this data selection and strengthen the stereological assumptions used in training.