Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 390, Issue 1-2, Pages 127-138Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2004.09.019
Keywords
Al-Mg-Si alloys; U2-Al4Mg4Si4 precipitates; high-resolution transmission electron microscopy; precipitate coherency relations
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The atomic structure of a common precipitate in the Al-Mg-Si system has been determined. It is isotypic with TiNiSi (space group Pnma) and contains four units of MgAlSi in a unit cell of size a = 0.675 nm, b = 0.405 nm, c = 0.794 nm. EDS analyses support the composition. A model was based on the atomic structure of the beta' precipitate, electron diffraction and high-resolution transmission electron microscopy (HRTEM) images. A quantum mechanical refinement of the model removed discrepancies between simulated and experimental diffraction intensities. Finally, a multi-slice least square refinement confirmed the structure. The structural relation with beta is investigated. A similar Mg-Si plane also existing in beta and beta', can explain most coherency relations between the precipitate phases and with matrix. (C) 2004 Elsevier B.V. All rights reserved.
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