Distribution of intermetallics in an AA 2099-T8 aluminium alloy extrusion

Y. Ma, X. Zhou, G. E. Thompson, T. Hashimoto, P. Thomson, M. Fowles

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Microstructural characterisation of an AA 2099-T8 alloy extrusion has shown elongated grains with high angle grain boundaries and approximately equiaxed subgrains with low angle grain boundaries. The constituent particles in the alloy contain Al, Fe, Mn, and Cu, and fall into two groups of high and reduced contents of copper. The high-copper-containing and low-copper-containing phases are present individually or together in the form of multiphase particles. For the multiphase particles, the high-copper-containing phase is at the centre of the particle, surrounded by the low-copper-containing phase. The alloy also contains rod-like Al-Cu-Mn-Li and spherical β′ (Al3Zr) dispersoids, and fine age hardening precipitates of T1 (Al 2CuLi), δ′ (Al3Li) and θ′ (Al 2Cu). © 2010 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)46-53
    Number of pages7
    JournalMaterials Chemistry and Physics
    Volume126
    Issue number1-2
    DOIs
    Publication statusPublished - 15 Mar 2011

    Keywords

    • AA 2099-T8 aluminium alloy
    • Electron microscopy
    • Microstructure

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