Precipitation processes in an Al-2.5Cu-1.5Mg (wt. %) alloy microalloyed with Ag and Si

K. Raviprasad, C. R. Hutchinson, T. Sakurai, S. P. Ringer

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    65 Citations (Scopus)

    Abstract

    We have produced precipitation on and along both the 〈100〉 α and the {111}α crystal systems by microalloying an Al-2.5Cu-1.5Mg (wt. %) base alloy with Ag and Si. Using electron microscopy and atom probe field ion microscopy, we have demonstrated that Ag+Si additions produce multi-component clustering reactions. When compared to comparable quaternary compositions, the quinary alloy exhibits a higher hardness. The first precipitates observed were GPB zones, rich in Cu and Mg and containing traces of both Si and Ag. Following ageing at 200 °C, the peak hardness microstructure consisted of rod-shaped GPB zones along 〈100〉α together with X′ and Ω precipitation, both as plates on the {111}α planes. The Ω phase was less stable than the X′ phase and dissolved soon after ageing to peak hardness. This was associated with a rapid drop in hardness. The overaged microstructure was dominated by S phase.

    Original languageEnglish
    Pages (from-to)5037-5050
    Number of pages14
    JournalActa Materialia
    Volume51
    Issue number17
    DOIs
    Publication statusPublished - 2003 Oct 6

    Keywords

    • Aluminium alloys
    • Hardening
    • Precipitation
    • TEM

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Polymers and Plastics
    • Metals and Alloys

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