Measurement of strain fields in an edge dislocation

We present a strain analysis of an edge dislocation core in gold. The strain fields around an edge dislocation were mapped with a geometric phase analysis of high-resolution transmission electron microscopy images. The strain measurement results were compared with the gradient elasticity dislocation model, the field theory of elastoplasticity dislocation model and the Peierls–Nabarro dislocation model. We then concluded that for the field theory of elastoplasticity, the non-dimensional constant e0 is more suitable when chosen as 0.25 than with 0.399. However, the Peierls–Nabarro model is the most appropriate theoretical model to describe the deformation fields of the dislocation core.