Diffraction contrast from non-spherical distortions—in particular a cuboidal inclusion
- 1 October 1967
- journal article
- research article
- Published by Informa UK Limited in Philosophical Magazine
- Vol. 16 (142), 679-690
- https://doi.org/10.1080/14786436708222768
Abstract
Equations are derived for the displacement field due to a coherent cuboidal inclusion. The general treatment of the displacements due to a coherent precipitate of any shape or arrangement and for any set of elastic constants is indicated. Using two-beam dynamical equations and the column approximation it is shown that with transmission electron microscopy, a cuboidal inclusion can be distinguished from a spherical one by a ‘notch’ in the line of no contrast and/or an asymmetric image, when the operating reflection corresponds to a plane which is not a symmetry plane of the cube. Experimental observations on a Ni-Ti alloy confirm this result.Keywords
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