Fast and reliable evaluation of lattice distortions from convergent-beam electron diffraction patterns

Autor:	Horst Biermann, Z. Lu, S. Krämer, H. Mughrabi, Florian Pyczak
Rok vydání:	2003
Předmět:	Diffraction Chemistry business.industry Lattice distortion Convergent beam Condensed Matter Physics Hough transform law.invention Superalloy Investigation methods Optics Electron diffraction law Lattice (order) business
Zdroj:	Philosophical Magazine. 83:2383-2397
ISSN:	1478-6443 1478-6435
DOI:	10.1080/0141861031000109573
Popis:	A manual method for higher order Laue zone (HOLZ) line detection with an improved effective high-voltage correction for fast and reliable evaluation of local lattice distortions from convergent-beam electron diffraction (CBED) is presented. It is compared with a high-precision Hough transform method with a dynamic correction for each individual HOLZ line used by Kramer and Mayer. Both methods are applied to unfiltered and filtered experimental CBED patterns. As an example, the local lattice distortions in the γ − γ′ raft-like structure of a creep-deformed single-crystal nickel-based superalloy (CMSX-6) were measured. The lattice distortions obtained from both methods were analysed and showed good agreement. As a by-product, it was noted that specimen cooling enhanced the contrast of CBED patterns to the extent that the quality of CBED patterns taken at low temperatures without energy filtering was found to be qualitatively similar to that of CBED patterns taken at room temperature with energy filtering.
Databáze:	OpenAIRE
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