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

• Published in: Scripta materialia Vol. 109; pp. 68 - 71
• Main Authors: Kang, Sung Jin, Kim, Tae-Hoon, Yang, Cheol-Woong, Lee, Je In, Park, Eun Soo, Noh, Tae Won, Kim, Miyoung
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2015
• Subjects: Aluminum alloys; ALUMINUM ALLOYS (50 TO 99 AL); Aluminum base alloys; Atomic structure; COPPER ALUMINUM ALLOYS; Energy dispersive X-ray spectroscopy (EDXS); MOLECULAR STRUCTURE; PRECIPITATES; Precipitation; Scanning transmission electron microscopy; Scanning/transmission electron microscopy (STEM); Silver; Stacking; T1 phase; TRANSMISSION ELECTRON MICROSCOPY; X RAYS; Z-contrast microscopy; Aluminum alloys; T1 phase; Energy dispersive X-ray spectroscopy (EDXS); Scanning/transmission electron microscopy (STEM); Z-contrast microscopy
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2015.07.020

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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 0.94nm with successive stacking of identical 0.94nm thick layers.