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Etude cristallographique de la phase de transition M '' dans Al–8%Zn–1%Mg
Author(s) -
Régnier C.,
Bouvaist J.,
Simon J. P.
Publication year - 1982
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889882012734
Subject(s) - hexagonal crystal system , transmission electron microscopy , precession , crystallography , bar (unit) , phase (matter) , chemistry , phase transition , epitaxy , materials science , condensed matter physics , physics , nanotechnology , organic chemistry , meteorology , layer (electronics)
The structure of the transition phase M ′ in AlZnMg alloys has been studied by Buerger X‐ray precession photographs and transmission electron microscopy. The M ′ phase, also called η ′ or R , has a hexagonal or pseudo‐hexagonal cell with a = 4.96, c = 14.03 Å. It is confirmed that M ′ precipitates are hexagonal platelets with the following epitaxy: (00.1) M ′ //(111) Al and |10.0| M′ //10| Al . It is shown that none of the known models of the unit cell accounts for the observed scattered intensities.