Experimental examination of displacement and strain fields in an edge dislocation core

We present a displacement and strain analysis of edge dislocation core in gold. The displacement and strain field around the edge dislocation were mapped by geometric phase analysis of high-resolution transmission electron microscopy images. The displacement and strain measurement results were compared with the isotropic elastic theory dislocation model, the anisotropic elastic theory dislocation model, the Peierls-Nabarro dislocation model and the Foreman dislocation model (a = 4). These comparisons show that the Peierls-Nabarro model is the most appropriate theoretical model to describe the deformation fields of the dislocation core. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.