Influence of nano-structured silanols on the microstructure and mechanical properties of a4047 and a359 aluminum casting alloys

Andre Lee, Yang Lu, Allen Roche, Tsung Yu Pan

    Research output: Contribution to journalArticle

    Abstract

    Minor alloying elements present in aluminum silicon-based casting alloys, such as sodium, strontium, or boron-titanium, could eventually affect the alloy's microstructure and hence its mechanical properties. However, difficulties in balancing strength, ductility, and the subsequent precipitation strengthening heat treatment remain. The effects of nano-structured silanols based on partially condensed polyhedral oligomeric silsequioxanes (POSS-silanol) on the microstructure and mechanical properties of A4047 and A359 aluminum alloys were studied using a ''twostep'' process technique. The silanols react with active aluminum surface to form stable Si-O-Al bonds, while cage-like POSS core enables control of subsequent solidification process leading to desired mechanical performance. Using standard casting approach, the increase of both ductility and the tensile strength of the A4047 and A359 alloys is due to a highly refined fine fibrous of eutectic Al-Si formed instead of the irregular flakes as well as a refined primary aluminum phase as compared to the unmodified alloys. It has been found that this newly developed approach can also be expanded to other heat-treatable casting aluminum alloys with specific interest on changes in the microstructure of both primary aluminum phase and eutectic constituent.

    Original languageEnglish (US)
    Pages (from-to)322-328
    Number of pages7
    JournalInternational Journal of Metalcasting
    Volume10
    Issue number3
    DOIs
    StatePublished - Jul 1 2016

    Profile

    Aluminum
    Microstructure
    Casting
    Mechanical properties
    Abdominal Muscles
    Eutectics
    Ductility
    Aluminum alloys
    Cardanolides
    Aprindine
    Cortical Synchronization
    Aluminum castings
    Strengthening (metal)
    Strontium
    Alloying elements
    Solidification
    Boron
    Tensile strength
    Titanium
    Heat treatment

    Keywords

    • A359
    • A4047
    • Aluminum casting alloys
    • Modification
    • Silanol
    • Solidification

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Industrial and Manufacturing Engineering
    • Materials Chemistry
    • Metals and Alloys

    Cite this

    Influence of nano-structured silanols on the microstructure and mechanical properties of a4047 and a359 aluminum casting alloys. / Lee, Andre; Lu, Yang; Roche, Allen; Pan, Tsung Yu.

    In: International Journal of Metalcasting, Vol. 10, No. 3, 01.07.2016, p. 322-328.

    Research output: Contribution to journalArticle

    Lee, Andre; Lu, Yang; Roche, Allen; Pan, Tsung Yu / Influence of nano-structured silanols on the microstructure and mechanical properties of a4047 and a359 aluminum casting alloys.

    In: International Journal of Metalcasting, Vol. 10, No. 3, 01.07.2016, p. 322-328.

    Research output: Contribution to journalArticle

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