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 eo 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. (C) 2009 Elsevier B.V. All rights reserved.