Particle and liquid motion in semi-solid aluminium alloys: A quantitative in situ microradioscopy study

S. Zabler, A. Ershov, A. Rack, F. Garcia-Moreno, T. Baumbach, J. Banhart

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    Semi-solid melts exhibit a very unpredictable rheology and filling dynamics, when injected into thin-walled components. Optimization of the process requires an insight into the casting process during injection. For this purpose we injected semi-solid an Al-Ge alloy into two different thin channel geometries while recording high resolution radiographs at fast frame rates (up to 1000 images per s). Comparison of a bottleneck channel, which has previously been used for slower experiments, with a right-angle turn geometry reveals a significant influence of the channel shape on the flow behaviour of the particle-liquid mixture. While the bottleneck is quickly sealed with densified solid, turbulences in the right-angle turn apparently permit solid particles and clusters to move conjointly with the liquid and thus achieve a more complete filling. Single particle trajectories and rapid break-up of solid skeletons in such a system have been observed for the first time in situ.

    Original languageEnglish
    Pages (from-to)1244-1253
    Number of pages10
    JournalActa Materialia
    Volume61
    Issue number4
    DOIs
    Publication statusPublished - 1 Feb 2013

    Keywords

    • In situ
    • Rheology
    • Semi-solid
    • Synchrotron radiation
    • X-ray radiography

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Ceramics and Composites
    • Polymers and Plastics
    • Metals and Alloys

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  • Cite this

    Zabler, S., Ershov, A., Rack, A., Garcia-Moreno, F., Baumbach, T., & Banhart, J. (2013). Particle and liquid motion in semi-solid aluminium alloys: A quantitative in situ microradioscopy study. Acta Materialia, 61(4), 1244-1253. https://doi.org/10.1016/j.actamat.2012.10.047