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Formation of New Intermetallic Phases in the Ta–Ni–Al System

  • PHYSICOCHEMICAL PRINCIPLES OF CREATING MATERIALS AND TECHNOLOGIES
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Inorganic Materials: Applied Research Aims and scope

Abstract

The peculiarities of structure and phase formation in the 5 Ta–2 Ni–3 Al intermetallic system are studied in the paper. The TaNiAl, NiAl, Ni2Al3, and Ta phases are found in the alloy produced by self-propagating high-temperature synthesis (SHS). A transition layer with the composition of Ta51Ni20Al29 about 1–2 μm thick is formed on the interface between the unreacted Ta particles and the TaNiAl phase. Remelting of the synthesized alloy at a temperature of about 3000°C leads to the formation of three structural components with the following compositions: Ta85Ni7Al8, Ta52Ni20Al28, and Ta53Ni25Al22. X-ray analysis of the remelted alloy shows the presence of reflections that do not correspond to any of the known phases in the Ta–Ni–Al system. An alloy with a similar composition is synthesized by electrothermal explosion (ETE) under load. The synthesized alloy has a heterogeneous structure and multiphase composition of the surface layer which is similar to the alloy produced by SHS. The central region of the sample produced by ETE is similar to the structural and phase composition of the sample melted at temperature of 3000°C. The obtained data show the possibility of synthesizing in the Ta–Ni–Al system various phases with high Ta content (more than 50 at %).

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Authors and Affiliations

  1. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    A. S. Shchukin, D. Yu. Kovalev, A. E. Sytschev & A. V. Shcherbakov

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  1. A. S. Shchukin
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  2. D. Yu. Kovalev
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  3. A. E. Sytschev
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  4. A. V. Shcherbakov
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Correspondence to A. S. Shchukin.

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Translated by K. Gumerov

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Shchukin, A.S., Kovalev, D.Y., Sytschev, A.E. et al. Formation of New Intermetallic Phases in the Ta–Ni–Al System. Inorg. Mater. Appl. Res. 11, 271–276 (2020). https://doi.org/10.1134/S2075113320020355

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  • DOI: https://doi.org/10.1134/S2075113320020355

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