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New Casting Alloys Based on the Al+Al4(Ca,La) Eutectic

  • Aluminum and Magnesium: Casting Technology and Solidification
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Abstract

The structure of the previously unstudied ternary Al-Ca-La system near the aluminum corner has been analyzed using experimental [scanning electron microscopy, electron microprobe analysis (EMPA), and x-ray diffraction analysis (XRD)] and computational analysis (thermodynamic calculations). Based on the experimental data, the projection of the liquidus surface and solid-state phase-field distribution of the ternary system have been suggested. It is shown that Al4(Ca,La) and Al11(La,Ca)3 compounds can be in equilibrium with aluminum. EMPA and XRD analyses have revealed significant mutual solubility between the binary Al4(Ca,La) and Al11(La,Ca)3 intermetallics which leads to significant changes in their structure and mechanical and physical properties. The analysis of hot tearing susceptibility together with linear contraction showed that new Al-(2–4)wt.%Ca-(0–2)wt.%La-1.5 wt.%Mn hypoeutectic quaternary alloys have excellent casting properties comparable to those of the most manufacturable casting branded aluminum alloys, e.g., A356 and 361.

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Acknowledgements

The study was carried out by the financial support of the grant of the Russian Science Foundation (Project No. 20-19-00249) (preparation of alloys, electron microscopy (SEM, EMPA), and XRD) and by the RFBR, Project No. 19-33-90031 (thermodynamic calculations, hot tearing susceptibility and linear contraction analysis).

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Authors and Affiliations

  1. Department of Metal Forming, National University of Science and Technology MISiS, Leninsky pr. 4, Moscow, Russia, 119049

    Torgom K. Akopyan, Nikolay V. Letyagin & Nataliya O. Korotkova

  2. Department of Physical Materials Science, National University of Science and Technology MISiS, Leninsky pr. 4, Moscow, Russia, 119049

    Tat’yana A. Sviridova

  3. Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology MISiS, Leninsky pr. 4, Moscow, Russia, 119049

    Alexey S. Prosviryakov

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  1. Torgom K. Akopyan
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  2. Nikolay V. Letyagin
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  3. Tat’yana A. Sviridova
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  4. Nataliya O. Korotkova
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  5. Alexey S. Prosviryakov
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Correspondence to Torgom K. Akopyan.

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Akopyan, T.K., Letyagin, N.V., Sviridova, T.A. et al. New Casting Alloys Based on the Al+Al4(Ca,La) Eutectic. JOM 72, 3779–3786 (2020). https://doi.org/10.1007/s11837-020-04340-z

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  • DOI: https://doi.org/10.1007/s11837-020-04340-z

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