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Observation and Prediction of the Hot Tear Susceptibility of Ternary Al-Si-Mg Alloys

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Abstract

An investigation into the hot tear susceptibility of ternary Al-Si-Mg alloys has been made using direct crack observation, measurement of load response, and predictions made by a modified Rappaz-Drezet-Gremaud (RDG) hot tearing model. A peak in both the hot tear susceptibility and the load at solidus occurred at approximately 0.2Si and 0.15Mg, and then the hot tear susceptibility decreased as the total solute content increased. In general, a good correlation was found among the observation of cracks, the load at solidus, and the predictions of the RDG hot tearing model, although it was shown that correlation with the RDG model depended critically on the fraction solid at which solid coalescence was assumed to occur. A combination of these approaches indicated that when the total Si+Mg content and the Si:Mg ratio increased toward four, a decrease occurred in the hot tear susceptibility because of an increase in the amount of final eutectic formed. At the lowest Si:Mg ratio of 0.25, the RDG model also predicted a lower relative hot tear susceptibility than that measured by the load at solidus. In these alloys, the final stages of solidification are predicted to occur over a large temperature range, and hence, both the predictions of the RDG model and the measurement of the load were dependent on which fraction solid was chosen for grain coalescence. In the alloys studied in this article, the formation of small amounts of the ternary eutectic Al+Mg2Si+Si caused the highest hot tear susceptibility.

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Acknowledgments

The CAST Cooperative Research Center was established under, and is supported in part by, the Australian Government’s Cooperative Research Center’s Program.

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Authors and Affiliations

  1. CAST Co-operative Research Centre, St Lucia, QLD, 4072, Australia

    Mark A. Easton (Program Manager), John Grandfield (Director), Cameron J. Davidson (Research Scientist), David H. StJohn (Director) & Lisa D. Sweet (Senior Research Engineer)

  2. Department of Materials Engineering, Monash University, Melbourne, 3800, Australia

    Mark A. Easton (Program Manager) & Lisa D. Sweet (Senior Research Engineer)

  3. Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, 4350, Australia

    Hao Wang (Associate Professor)

  4. Grandfield Technology Pty. Ltd., Melbourne, 3055, Australia

    John Grandfield (Director)

  5. CSIRO, Division of Process Science and Engineering, Pullenvale, Queensland, 4069, Australia

    Cameron J. Davidson (Research Scientist)

  6. Centre for Advanced Materials Processing and Manufacturing (AMPAM), School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, 4072, Australia

    David H. StJohn (Director)

  7. Department of Materials Engineering, ARC Centre of Excellence in the Design of Light Metals, Monash University, Melbourne, 3800, Australia

    Malcolm J. Couper (Partner Investigator)

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  1. Mark A. Easton
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Correspondence to Mark A. Easton.

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Manuscript submitted June 14, 2011.

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Easton, M.A., Wang, H., Grandfield, J. et al. Observation and Prediction of the Hot Tear Susceptibility of Ternary Al-Si-Mg Alloys. Metall Mater Trans A 43, 3227–3238 (2012). https://doi.org/10.1007/s11661-012-1132-6

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