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Atomic structure and growth mechanism of T1 precipitate in Al-Cu-Li-Mg-Ag alloy

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Title: Atomic structure and growth mechanism of T1 precipitate in Al-Cu-Li-Mg-Ag alloy

Author(s): Sung Jin Kang; Kim T.-H.; Yang C.-W.; Lee J.I.; Park E.S.; Taewon Noh; Kim M.

Subject: Aluminum alloys, ; Energy dispersive X-ray spectroscopy (EDXS), ; Scanning/transmission electron microscopy (STEM), ; T<inf>1</inf> phase, ; Z-contrast microscopy

Abstract: The atomic structure of a 0.94-nm-thick T1 precipitate in an Al-Cu-Li-Mg-Ag alloy is investigated by combining aberration-corrected scanning transmission electron microscopy (STEM) and energy-dispersive X-ray spectroscopy (EDX). Ag segregates at the first layer of the T1 precipitate interface, revealing a significant compositional variation of Ag throughout the interface. Moreover, the T1 precipitate thickened from 0.94 nm with successive stacking of identical 0.94 nm thick layers. © 2015 Acta Materialia Inc