Microstructure and precipitation in Al-Li-Cu-Mg-(Mn, Zr) alloys

Gao, N., Starink, M.J., Davin, L., Cerezo, A., Wang, S.C. and Gregson, P.J. (2005) Microstructure and precipitation in Al-Li-Cu-Mg-(Mn, Zr) alloys. Materials Science and Technology, 21, (9), 1010-1018. (doi:10.1179/174328405X27034).


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Original Publication URL: http://dx.doi.org/10.1179/174328405X27034


Hot rolled Al-6Li-1Cu-1Mg-0.2Mn (at.%) (Al-1.6Li-2.2Cu-0.9Mg-0.4Mn, wt.%) and Al-6Li-1Cu-1Mg-0.03Zr (at.%) (Al-1.6Li-2.3Cu-1Mg-0.1Zr, wt.%) alloys developed for age forming were studied by tensile testing, electron backscatter diffraction (EBSD), three-dimensional atom probe (3DAP), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). For both alloys, DSC analysis shows that ageing at 150°C leads initially to formation of zones/clusters, which are later gradually replaced by S phase. On ageing at 190°C, S phase formation is completed within 12 h. The precipitates identified by 3D atom probe and TEM can be classified into (a) Li-rich clusters containing Cu and Mg, (b) a plate-shaped metastable precipitate (similar to GPB2 zones/S''), (c) S phase and (d) delta' spherical particles rich in Li. The Zr containing alloy also contains beta' (Al3Zr) precipitates and composite beta'/delta' particles. The beta' precipitates reduces recrystallisation and grain growth leading to fine grains and subgrains.

Item Type: Article
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Keywords: Al-Li-Cu-Mg alloy, 3DAP, TEM, DSC, age forming
Subjects: T Technology > TN Mining engineering. Metallurgy
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 19164
Date Deposited: 16 Jan 2006
Last Modified: 27 Mar 2014 18:08
Contact Email Address: n.gao@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/19164

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