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Size-Effect Diffuse Scattering in High Voltage Electron Diffraction from Disordered α-CuAl

Published online by Cambridge University Press:  21 February 2011

J.R. Sellar  and
D. Imeson
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Strain plays an important role in many solid-state phase transformations and strain-related order parameters have recently been a topic of considerable research activity. Long range strain fields due to dislocations [1] and the strain around interstitial defects [2] have also come under study by electron diffraction and imaging methods. In this note we report the observation of weak, asymmetric diffuse size-effect scattering (SES) in a dilute partially-ordered binary alloy (Cu - 16.7 at. % Al) under dynamical diffraction conditions in a high-voltage electron microscope (HVEM) operating at around 305 kV. The asymmetry, which is of odd parity around the sharp peaks of the average lattice of the alloy crystal, is due to an elastic strain field associated with atoms displaced from their average positions in the lattice, as a consequence of their difference in atomic size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 189
Copyright
Copyright © Materials Research Society 1984

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References

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