The effect of coarse second-phase particles on the rate of grain refinement during severe deformation processing

P.J. Apps, Jacob R. Bowen, P.B. Prangnell

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The effect of second-phase particles on the rate of grain refinement during severe deformation processing has been investigated, by comparing the microstructure evolution in an AA8079 aluminium alloy, containing 2.5 vol.% of ~2 μm particles, with that in a high purity, single-phase, Al-0.13% Mg alloy, deformed identically by ECAE to an effective strain of ten. The materials were analysed by high-resolution EBSD orientation mapping, which revealed that grain refinement occurred at a dramatically higher rate in the particle-containing alloy. A submicron grain structure could be achieved by an effective strain of only five in the particle-containing alloy, compared to ten in the single-phase material. The mechanisms that contribute to this acceleration of the grain refinement process are discussed.
    Original languageEnglish
    JournalActa Mater.
    Volume51
    Pages (from-to)2811-2822
    DOIs
    Publication statusPublished - 2003

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