Dislocation-induced Elastic Fields for FCC Crystals

Introduction

• Plastic deformation leaves crystals highly dislocated.
• The internal fields of these dislocations represent the main signature of the dislocation structures that can be probed experimentally.
• Namely the lattice rotation and elastic strain can be used to compute the dislocation density tensor, a key geometric measure for the dislocation system in distorted crystals.
• X-ray microscopy currently provides spatially resolved measurements of local lattice orientation and dislocation density tensor in 3D and with sub-micron scale resolution.
• This provides a previously missing bridge between mesoscale deformation experiments and computer simulations results.
• We investigate the statistical behavior of those fields, as a step towards comparison between mesoscale simulations and experiments.