Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9796662 | Materials Science and Engineering: A | 2005 | 12 Pages |
Abstract
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 βⲠprecipitate, 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 βⳠis investigated. A similar Mg-Si plane also existing in βⳠand βâ², can explain most coherency relations between the precipitate phases and with matrix.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
S.J. Andersen, C.D. Marioara, A. Frøseth, R. Vissers, H.W. Zandbergen,