EBSD- and ECCI-based Assessments of Inhomogeneous Plastic Strain Evolution Coupled with Digital Image Correlation

Abstract

We measured the local grain orientation gradient and dislocation density using electron backscatter diffraction (EBSD) measurement and electron channeling contrast imaging (ECCI) to obtain strain maps near a stress concentration source in pure nickel (Ni) as a face-centered cubic (FCC) model sample. In particular, we obtained the relationship amongst the grain orientation spread (GOS), dislocation density, and equivalent plastic strain on the sample surface, which were obtained by EBSD, ECCI, and digital image correlation (DIC), respectively. After obtaining the GOS-strain and dislocation density-strain relationships, the strain distribution in the interior of the sample was also determined by measuring the GOS and dislocation density, which were linearly correlated. The dislocation density-strain relationship exhibited a relatively small deviation.