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

By N. Gao, M.J. Starink, L. Davin, A. Cerezo, S.C. Wang and P.J. Gregson

Abstract

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

Topics: TN, QC
Year: 2005
OAI identifier: oai:eprints.soton.ac.uk:19164
Provided by: e-Prints Soton

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Citations

  1. (1969). Acta Metall.,
  2. (1976). Aluminum ‘Alloys Structure and Properties’,
  3. (1999). Atom Probe Tomography’, Klumer Academic/Plenum Publishers,
  4. (1977). Philosophical Magazine,
  5. (1986). Sanchez: : Acta Mater.,
  6. (1984). Sande: Scripta Metall.,
  7. (1998). The Minerals, Metals & Materials Society,
  8. (1977). Trans. Japan Inst. Metals,
  9. (1985). Wycliffe: Scripta Metall.,

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