Precipitates in an Al-Mg-Ge alloy studied by aberration-corrected scanning transmission electron micrscopy

Reuben Bjorge, Philip Nakashima, Calin Marioara, Sigmund Andersen, Barrington Muddle, Joanne Etheridge, Randi Holmestad

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The precipitates present in an Al–0.59Mg–0.71Ge (at.%) alloy have been studied using aberration-corrected high-angle annular dark-field scanning transmission electron microscopy. Two types of needle-shaped precipitates growing along 〈0 0 1〉Al were found: a phase isostructural to the trigonal U1 phase found in Al–Mg–Si alloys, and finer precipitates with a hexagonal arrangement of Ge columns. The study revealed the presence of a complex interface structure surrounding the U1-like precipitates, and an explanation based on interatomic distances is proposed.
Original languageEnglish
Pages (from-to)6103 - 6109
Number of pages7
JournalActa Materialia
Issue number15
Publication statusPublished - 2011

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