The phase composition of aluminum alloys of the Al – Ca – Ni – Sc system containing 0.3 wt.% Sc is studied. It is shown that the aluminum solid solution may be in equilibrium not only with binary phases (Al4Ca, Al3Sc and Al3Ni) but also with a ternary Al9NiCa compound. The temperature of attainment of maximum hardening due to precipitation of nanoparticles of phase Al3Sc is determined for all the alloys studied. Principal possibility of creation of castable alloys based on an (Al) + Al4Ca + Al9NiCa eutectic, the hardening heat treatment of which does not require quenching, is substantiated.
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The work has been performed with support of Grant 14-19-00632 of the Russian Scientific Foundation and Grant NSh-9899.2016.8 of the President of the Russian Federation for Supporting the Leading Scientific Schools.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 12 – 17, February, 2017.
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Belov, N.A., Naumova, E.A., Bazlova, T.A. et al. Phase Composition and Hardening of Castable Al – Ca – Ni – Sc Alloys Containing 0.3% Sc. Met Sci Heat Treat 59, 76–81 (2017). https://doi.org/10.1007/s11041-017-0106-0
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DOI: https://doi.org/10.1007/s11041-017-0106-0