Laser sintering of blended Al-Si powders

Eyitayo Olatunde Olakanmi, Kenneth W. Dalgarno, Robert F. Cochrane

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    Purpose - The purpose of this paper is to study the effects of particle size distribution, component ratio, particle packing arrangement, and chemical constitution on the laser sintering behaviour of blended hypoeutectic Al-Si powders. Design/methodology/approach - A range of bimodal and trimodal powder blends were created through mixing Al-12Si and pure aluminium powder. The powder blends were then processed using selective laser sintering to investigate the effect of alloy composition, powder particle size and bed density on densification and microstructural evolution. Findings - For all of the powder blends the sintered density increases with the specific laser energy input until a saturation level is reached. Beyond this saturation level no further increase in sintered density is obtained for an increase in specific laser energy input. However, the peak density achieved for a given blend varied significantly with the chemical constitution of the alloy, peaking at approximately 9 wt% Si. The tap density of the raw powder mixture (assumed to be representative of bed density) was also a significant factor. Originality/value - This is the first study to consider the usefulness of silicon as an alloying element in aluminium alloys to be processed by selective laser sintering. In addition the paper outlines the key factors in optimising processing parameters and powder properties in order to attain sound sinterability for direct laser sintered parts.

    Original languageEnglish
    Pages (from-to)109-119
    Number of pages11
    JournalRapid Prototyping Journal
    Volume18
    Issue number2
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    Sintering
    Powders
    Lasers
    Microstructural evolution
    Alloying elements
    Densification
    Particle size analysis
    Particles (particulate matter)
    Aluminum alloys
    Particle size
    Acoustic waves
    Aluminum
    Silicon
    Processing
    Chemical analysis

    All Science Journal Classification (ASJC) codes

    • Industrial and Manufacturing Engineering
    • Mechanical Engineering

    Cite this

    Olakanmi, Eyitayo Olatunde ; Dalgarno, Kenneth W. ; Cochrane, Robert F. / Laser sintering of blended Al-Si powders. In: Rapid Prototyping Journal. 2012 ; Vol. 18, No. 2. pp. 109-119.
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    Laser sintering of blended Al-Si powders. / Olakanmi, Eyitayo Olatunde; Dalgarno, Kenneth W.; Cochrane, Robert F.

    In: Rapid Prototyping Journal, Vol. 18, No. 2, 2012, p. 109-119.

    Research output: Contribution to journalArticle

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