Effect of strontium modifiers on porosity in cast Al-Si alloys

P. D. Lee, S. Sridhar

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    The effect of strontium on porosity formation in aluminum-silicon alloys is not well understood and there is no consensus upon the cause of the effects observed. This paper describes a series of experiments where the effect of adding strontium on pore formation was observed directly with combination of a traditional temperature gradient stage and real time micro-focus radiography. These in situ observations provide a new insight into the effect of strontium on the nucleation and growth kinetics of porosity. The addition of strontium was found to have a minor effect on the growth of the pores in the mushy zone. However, strontium appeared to alter the nucleation and stability of hydrogen bubbles within the melt. The interaction of strontium with titanium-boride grain refiners produced an even stronger change in the nucleation and stability of the bubbles formed.
    Original languageEnglish
    Title of host publicationTMS Annual Meeting|TMS Annu Meet
    EditorsP.R. Taylor, D. Chandra, R,G, Bautista
    Pages555-565
    Number of pages10
    Publication statusPublished - 2002
    EventEPD Congress 2002 on Fundamentals of Advanced Materials for Energy Conversion - Seattle, WA
    Duration: 1 Jul 2002 → …

    Conference

    ConferenceEPD Congress 2002 on Fundamentals of Advanced Materials for Energy Conversion
    CitySeattle, WA
    Period1/07/02 → …

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