Orientation relationship, shape change and their traces in electron diffraction patterns and high-resolution transmission electron microscopy images

This paper outlines a straightforward method that can be used to predict the total number of orientation relationships between a pair of lattices that can be related by an invariant plane strain transformation and the shape change associated with each of the orientation relationships. This paper also provides a simple technique for calculating the shape strain and crystallography directly from electron diffraction patterns or Fourier-transformed digital patterns of high-resolution transmission electron microscopy images. It demonstrates that many of those diffusional phase transformations that are traditionally classified as non-displacive exhibit in fact a remarkable shape change and that the shape change can even be a simple shear. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.