Compaction and sintering behaviour of A356-fly ash composites

A preliminary investigation

Nouari Saheb, P. T. Meng, A. R. Daud

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    In the present study, A356-fly ash metal matrix composites were developed through powder metallurgy route. The composites were mixed by using the ball milling technique, shaped through uniaxial and cold isostatic compaction, and then sintered at 520°C. Scanning electron microscopy and X-ray diffraction were used for microstructure and phase characterisation. The density and microhardness of the composites were evaluated as a function of fly ash content, compaction pressure, sintering time and age hardening time. Uniaxial cold compaction of the composites increased their green density and cold isostatic compaction of the compacts led to a further increase in the density. At a constant compaction pressure, the density decreased with increasing fly ash content, resulting in light weight composites. The microhardness of the composites increased with the addition of 10 wt-% fly ash while it decreased with the addition of 20 and 30 wt-% fly ash. Sintering at 520°C increased the density of the composites and the grain size of the α-Al phase of the matrix. The matrix alloy and the composite containing 10 wt-% fly ash showed some response to age hardening at 160°C. However, no response to age hardening was observed at 200°C.

    Original languageEnglish
    Pages (from-to)54-59
    Number of pages6
    JournalPowder Metallurgy
    Volume50
    Issue number1
    DOIs
    Publication statusPublished - Mar 2007

    Fingerprint

    Coal Ash
    fly ash
    Fly ash
    sintering
    Compaction
    Sintering
    composite materials
    Composite materials
    precipitation hardening
    Age hardening
    microhardness
    Microhardness
    metal matrix composites
    powder metallurgy
    matrices
    hardening
    Ball milling
    Powder metallurgy
    balls
    grain size

    Keywords

    • A356 alloy
    • Compaction
    • Composites
    • Fly ash
    • Sintering

    ASJC Scopus subject areas

    • Metals and Alloys

    Cite this

    Compaction and sintering behaviour of A356-fly ash composites : A preliminary investigation. / Saheb, Nouari; Meng, P. T.; Daud, A. R.

    In: Powder Metallurgy, Vol. 50, No. 1, 03.2007, p. 54-59.

    Research output: Contribution to journalArticle

    Saheb, Nouari ; Meng, P. T. ; Daud, A. R. / Compaction and sintering behaviour of A356-fly ash composites : A preliminary investigation. In: Powder Metallurgy. 2007 ; Vol. 50, No. 1. pp. 54-59.
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