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Structure and Properties of Nb–Si–Al Hypoeutectic Alloys Obtained by Aluminothermy at Different Cooling Rates

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Abstract—

The effect of the cooling rate on the structure and properties of hypoeutectic Nb–Si–Al alloys obtained by aluminothermy in an argon atmosphere studied by scanning electron microscopy, X-ray phase analysis, and energy-dispersive analysis. The indentation method is used to measure the mechanical properties of the obtained alloys: the fracture toughness and hardness. The cooling rate of the alloy is regulated by replacing the crucible material: the cooling rates of the alloy differ by almost an order of magnitude. The difference in the cooling rates does not affect the phase composition of the obtained alloys: in all cases, a solid solution of silicon and aluminum in niobium (Nbss) and β-Nb5Si3 silicide are formed. The microstructures of the obtained alloys are similar, but differ in dispersion. The formation of a finer structure led to an increase in the mechanical properties of the alloy compared to those of the alloy with a lower degree of structure dispersion.

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FUNDING

We are grateful to V.A. Karev for obtaining the Nb–Si–Al cast alloys. The study was carried out according to the subject of scientific research no. 121030100001-3 using equipment of the shared facilities “Center for Physical and Physical-Chemical Methods of Analysis, Investigation of the Properties and Characteristics of a Surface, Nanostructures, Materials, and Products” of the Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences (project unique identifier RFMEFI62119X0035).

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  1. Udmurt Federal Research Center Ural Branch of the Russian Academy of Sciences, 426067, Izhevsk, Russia

    I. V. Sapegina, B. E. Pushkarev, S. A. Tereshkina & V. I. Ladyanov

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  1. I. V. Sapegina
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  2. B. E. Pushkarev
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  3. S. A. Tereshkina
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  4. V. I. Ladyanov
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Sapegina, I.V., Pushkarev, B.E., Tereshkina, S.A. et al. Structure and Properties of Nb–Si–Al Hypoeutectic Alloys Obtained by Aluminothermy at Different Cooling Rates. J. Surf. Investig. 15, 1345–1348 (2021). https://doi.org/10.1134/S1027451021060422

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