Electron diffraction contrast from ledges at the interfaces of faceted θ′ precipitates
- 1 November 1970
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 22 (179) , 1049-1061
- https://doi.org/10.1080/14786437008221074
Abstract
Ledges have been observed at the habit-plane interface of faceted ø’ precipitates in an aluminium-copper alloy. The ledges are between 15 and 65 Å in height and are visible both by strain field and thickness contrast effects. The strain field behaves qualitatively as a prismatic dislocation loop lying at the precipitate-matrix interface. When a precipitate reflection only is excited, a characteristic black-white contrast is observed in dark field and this enables the sense of the loop to be determined, i.e. growth or dissolution ledges can be distinguished.Keywords
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