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Formation of Metastable Aluminides in Al–Sc–Ti (Zr, Hf) Cast Alloys

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Abstract

The effect of the ternary alloys composition and overheating of their melts (at 100–370 K above the liquidus temperature) on the morphology and composition of aluminides in the Al–Sc–Ti, Al–Sc–Zr, Al–Sc–Hf systems were investigated. It was shown that during the crystallization of these melts under certain conditions, the primary precipitated phase are the complex aluminides Al3(ScxZr1−x), Al3(ScxTi1−x), Al3(ScxHf1−x) having a metastable cubic lattice with L12 structure, which matches the α-Al structural type. The variety of growth forms of aluminides is explained by a combination of a number of factors: the magnitude of overheating of the melt, the difference in the diffusion coefficients of transition metals, and the local concentration of transition metals in the respective growth zones.

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Acknowledgments

The work was carried out according to the state assignment for IMET UB RAS. The results were obtained using the equipment of the Ural-M Center for Collective Use.

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Authors and Affiliations

  1. Laboratory of Physical Chemistry of Metallurgical Melts, Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences, 101 Amundsena street, Yekaterinburg, Russia, 620016

    E. Popova, P. Kotenkov, A. Shubin & I. Gilev

  2. Department of Metallurgy of Iron and Alloys, Ural Federal University Named After the First President of Russia B. N. Yeltsin, 19 Mira street, Yekaterinburg, Russia, 620002

    P. Kotenkov

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  1. E. Popova
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Correspondence to P. Kotenkov.

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Popova, E., Kotenkov, P., Shubin, A. et al. Formation of Metastable Aluminides in Al–Sc–Ti (Zr, Hf) Cast Alloys. Met. Mater. Int. 26, 1515–1523 (2020). https://doi.org/10.1007/s12540-019-00397-x

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