Microstructural changes at the initial stage of precipitation in an aluminum-silicon alloy

Keiyu Nakagawa, Teruto Kanadani, Laurence Anthony, Hatsujiro Hashimoto

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    12 Citations (Scopus)

    Abstract

    In this study, we use a transmission electron microscope (TEM) to observe the microstructure of an Al-Si alloy from immediately after quenching to the initial stage of precipitation. Results reveal the presence of patches immediately after quenching that are thought to be Si clusters, and these are coherent with the {111}matrix. At the initial stage of aging, Si crystals with a plate-like structure are observed, contradicting the round shape previously described. We propose that the Si clusters that appear immediately after quenching act as nuclei for the plate-like Si crystals. As the aging time increases, these increase in length and thickness, becoming thick plate-like Si phase precipitates.

    Original languageEnglish
    Pages (from-to)779-783
    Number of pages5
    JournalMaterials Transactions
    Volume46
    Issue number4
    DOIs
    Publication statusPublished - 2005 Apr

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    Keywords

    • Aluminum-silicon alloy
    • Initial stage of precipitation
    • Microstructure
    • Plate-like silicon crystal
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Materials Science(all)
    • Metals and Alloys

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