Diffraction contrast from spherically symmetrical coherency strains

Abstract The properties of images formed by diffraction contrast in thin metal foils viewed by transmission electron microscopy are studied by means of the dynamical theory of diffraction, including absorption. It is shown how quantitative information regarding the state of strain in the matrix surrounding a spherical inclusion can be obtained from the micrographs. The theory is exemplified by the case of Cu—2% (wt) Co, and measurements of strain made in this system are in good agreement with the expected value.