Lattice mismatch of δ′ particles in an Al-Li alloy
- verfasst von
- Janos Lendvai, Andras Borbely, Hans Jurgen Maier, Tamas Ungar
- Abstract
The lattice strains around δ′ (Al3Li) precipitates in an Al - Li alloy were studied by diffuse X-ray scattering near the (220) Bragg reflection. Convergent beam electron diffraction (CBED) was also used. In the calculation of the diffuse scattering due to precipitates on the basis of the kinematical theory, the relatively large volume fraction (about 20%) of the precipitates was taken into account by incorporating into the model a `sphere of influence' around the particles as well as an interparticle interference effect. The measured X-ray intensity distributions were fitted by calculated curves for which the particle radius and the lattice misfit were adjustable parameters. The small negative values obtained for the lattice mismatch were found to decrease with particle size. CBED results also indicate the presence of three-dimensional isotropic strain fields with small distortions around the δ′ precipitates. The values of misfit strain are considerably smaller than previously reported ones.
- Externe Organisation(en)
-
Eotvos Lorand University
Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU Erlangen-Nürnberg)
- Typ
- Artikel
- Journal
- Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
- Band
- 84
- Seiten
- 324-328
- Anzahl der Seiten
- 5
- ISSN
- 0044-3093
- Publikationsdatum
- 05.1993
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Physik der kondensierten Materie, Physikalische und Theoretische Chemie, Metalle und Legierungen, Werkstoffchemie
