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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Aberration-Corrected STEM Study of Precipitates in an Al-Mg-Si-Ge-Cu Alloy
verfasst von : Ruben Bjørge, Sigmund J. Andersen, Calin D. Marioara, Joanne Etheridge, Randi Holmestad
Erschienen in: ICAA13 Pittsburgh
Verlag: Springer International Publishing
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Precipitation in a Mg-rich Al-Mg-Si-Ge-Cu alloy was investigated using aberration-corrected high-angle annular dark-field scanning transmission electron microscopy. The precipitates were needle or lath shaped with the longest dimension parallel to <001>Al. The precipitates had no repeating unit cell when viewed along this direction. However, the precipitate structure in projection consisted of a hexagonal network of mixed Si and Ge columns, with Mg, Al, and Cu columns occupying specific sites in between the network columns. The Cu columns appeared with the same local arrangement of atomic columns as in Al-Mg-Si-Cu precipitates, and the Cu-free regions consisted of structural units with Mg and Al at specific sites. The proposed atomic model is supported by image simulations.