Yi Guo¹, David Collins², Edmund Tarleton³, Felix Hofmann³, Angus Wilkinson³, Ben Britton¹; ¹Imperial College London, ²Birmingham University, ³University of Oxford

We use ‘differential aperture micro-Laue diffraction’ (DAXM) to investigate the dislocation density distribution at grain boundary as the slip passage from one grain is blocked by its neighbouring grain. For those slip bands of the same variant blocked by grain boundary, some lead to local dislocation accumulation piling up at the boundary. We also observe a significant new mechanism, where the secondary dislocation seems to form a band structure that correlate with a specific crystallographic plane. We find such dislocation structures can be explicitly explained by the grain boundary ledge (disconnection) theory proposed by Li and Hirth who suggest this mechanism as process of minimising grain boundary energy density. We also include 2D to 3D GND comparisons, which are useful to consider regarding the breadth of 2D based HR-EBSD and related GND measurements within the literature.