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The Role of Porosity in Reducing the Thermal Conductivity of B319 Al Alloy with Decreasing Solidification Rate

  • Aluminum and Magnesium: High Strength Alloys for Automotive and Transportation Applications
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Abstract

Understanding the relationship between solidification rate and thermal conductivity can enable the functional design of advanced industrial components. In addition to microstructural coarsening, decreasing solidification rate typically increases casting porosity. Despite its potential detriment to material properties, porosity has been inadequately considered in conductivity investigations involving varied solidification rates. Consequently, conflicting and potentially misleading results are present in the literature. Accordingly, in this study, the effects of porosity on the as-cast thermal conductivity of unmodified B319 aluminium alloy were isolated from the effects of microstructural refinement. This was done by extracting samples from various locations along a series of castings, each with individual solidification rates from 3.31°C/s to 0.104°C/s. Thermal conductivity was found to be relatively unaffected by microstructural coarsening, yet it was significantly reduced by the increase in porosity associated with decreasing solidification rate. Hence, dendritic refinement is not an effective technique to enhance this alloy’s thermal conductivity.

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Acknowledgements

The authors are thankful to the Natural Sciences and Engineering Research Council of Canada (NSERC) for financial support of this project and for the award of the Canada Graduate Scholarship to Eli Vandersluis (Grant No. CGSD3-489708-2016). The authors are grateful to Alan Machin, Payam Emadi, Bernoulli Andilab, and the members of the Centre for Near-net-shape Processing of Materials (CNPM) at Ryerson University for experimental assistance and support.

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  1. Centre for Near-Net-Shape Processing of Materials, Ryerson University, 101 Gerrard Street East, Toronto, ON, M5B1G8, Canada

    Eli Vandersluis & Comondore Ravindran

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  1. Eli Vandersluis
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  2. Comondore Ravindran
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Correspondence to Eli Vandersluis.

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Vandersluis, E., Ravindran, C. The Role of Porosity in Reducing the Thermal Conductivity of B319 Al Alloy with Decreasing Solidification Rate. JOM 71, 2072–2077 (2019). https://doi.org/10.1007/s11837-019-03376-0

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  • DOI: https://doi.org/10.1007/s11837-019-03376-0

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