Abstract
Phase transformations of an Al–20 at % Si high-silicon hypereutectic alloy have been studied by differential barothermal analysis at temperatures of up to 800°C in argon compressed to 100 MPa. High pressure has been shown to raise the melting point of the alloy by 5°C during heating and to lower the eutectic solidification temperature by 5°C during cooling in comparison with the canonical phase diagram of the Al–Si system. At a temperature of 553°C, heating and cooling lead to silicon dissolution and decomposition of the aluminum-based solid solution, respectively. After high-pressure solidification, the silicon particles in the alloy have a bimodal size distribution. Quantitative porosity characteristics in the alloy after a barothermal scanning cycle are similar to those in the as-prepared alloy. The lattice parameters of the silicon and aluminum remain unchanged. The microhardness of the aluminum matrix of the alloy corresponds to that of pure aluminum.
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Prigunova, A.G., Belov, N.A., Taran, Yu.N., Zolotorevskii, V.S., Napalkov, V.I., and Petrov, S.S., Siluminy. Atlas mikrostruktur i fraktogramm promyshlennykh splavov (Silumins: Atlas of Microstructures and Fracture Surface Maps for Industrial Alloys), Moscow: Mosk. Inst. Stali i Splavov, 1996.
Westerlund, J. and Vimercati, A., Four decades of HIP progress, Met. Powd. Rep., 2000, vol. 55, no. 2, pp. 14–21.
Padalko, A.G., Praktika goryachego izostaticheskogo pressovaniya neorganicheskikh materialov (Practical Issues in Hot Isostatic Pressing of Inorganic Materials), Moscow: Akademkniga, 2007.
Murray, J.L. and McAlister, A.J., The Al–Si (aluminum–silicon) system, Bull. Alloy Phase Diagrams, 1984, vol. 5, no. 1, pp. 74–84.
Diagrammy sostoyaniya dvoinykh metallicheskikh sistem. Spravochnik (Phase Diagrams of Binary Metallic Systems: A Handbook), Lyakishev, N.P., Ed., Moscow: Mashinostroenie, 1996, 1997, 2001, vols. 1–3.
Kablov, E.N. and Golubovskii, E.R., Zharoprochnost’ nikelevykh splavov (High-Temperature Strength of Nickel Alloys), Moscow: Mashinostroenie, 2005.
Glazov, V.M., Chizhevskaya, S.N., and Glagoleva, N.N., Zhidkie poluprovodniki (Liquid Semiconductors), Moscow: Nauka, 1967.
Fujishiro, I., Mii, H., Senoo, M., and Akao, M., High pressure phase diagram of Al–Si system, J. Soc. Mater. Sci. Jpn., 1971, no. 20, pp. 952–955.
Mii, H., Senoo, M., and Fujishiro, I., Solid solubility of Si in Al under high pressure, Jpn. J. Appl. Phys., 1976, no. 15, pp. 777–783.
Padalko, A.G., Veselov, A.N., Avduhin, S.P., et al., Differential barothermal analysis (DBA) of Ni-base alloys, J. Therm. Anal. Calorim., 2003, vol. 72, no. 3, pp. 791–797.
Padalko, A.G., Belov, N.A., Veselov, A.N., and Talanova, G.V., Thermography of the phase transformations in a hypoeutectic Al–7% Si–0.5% Mg silumin at high pressures and temperatures, Russ. Metall. (Engl. Transl.), 2009, no. 1, pp. 65–60.
Padalko, A.G., Talanova, G.V., Zubarev, G.I., Fedotov, V.T., Suchkov, A.N., and Tsarev, V.I., Thermography of the phase transformations in nickel-based eutectic alloys at high pressures and temperatures, Russ. Metall. (Engl. Transl.), 2011, no. 3, 169–174.
Padalko, A.G., Talanova, G.V., Ponomareva, E.Yu., Talyat-Kelpsh, V.V., Shvorneva, L.I., Zubarev, G.I., Fedotov, V.T., Suchkov, A.N., and Baklan, V.A., Phase transformations at high pressures and temperatures and the structure of a hypoeutectic 1Ni–99Al alloy, Russ. Metall. (Engl. Transl.), 2012, no. 9, pp. 779–785.
Padalko, A.G., Talanova, G.V., Ponomareva, E.Yu., Talyat-Kelpsh, V.V., Shvorneva, L.I., Zubarev, G.I., Fedotov, V.T., Suchkov, A.N., and Baklan, V.A., Barothermal analysis and structure of the eutectic Al–Ni (2.7 at % Ni) alloy, Inorg. Mater., 2012, vol. 48, no. 6, pp. 582–587.
Zhukova, L.A., Aksenova, O.P., and Zamyatin, V.M., Enthalpy increment of a hypoeutectic Al–Si alloy during heating in solid and liquid states, Rasplavy, 2004, no. 2, pp. 36–39.
Mudry, S. and Shtablavyi, I., Cluster structure in Al–Si eutectic melt with solid Ni particles, Chem. Met. Alloys, 2008, no. 1, pp. 163–167.
Tonkov, E.Yu., Fazovye prevrashcheniya soedinenii pri vysokom davlenii (High-Pressure Phase Transformations of Compounds), Moscow: Metallurgiya, 1988, vols. 1–2.
Properties of aluminum. Handbook of Nonferrous Metals. http://www.libmetal.ru/al/al%20prop.htm.
Kovba, L.M. and Trunov, V.K., Rentgenofazovyi analiz (X-Ray Diffraction Analysis), Moscow: Mosk. Gos. Univ., 1976.
Hubbard, C.R., Evans, E.H., and Smith, D.K., The reference intensity ratio, I/I c , for computer simulated powder patterns, J. Appl. Crystallogr., 1976, vol. 9, pp. 169–174.
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Original Russian Text © E.V. Dedyaeva, T.K. Akopyan, A.G. Padalko, G.V. Talanova, G.I. Zubarev, A.D. Izotov, A.N. Suchkov, V.T. Fedotov, L.I. Shvorneva, 2016, published in Neorganicheskie Materialy, 2016, Vol. 52, No. 10, pp. 1148–1155.
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Dedyaeva, E.V., Akopyan, T.K., Padalko, A.G. et al. High-pressure phase transitions and structure of Al–20 at % Si hypereutectic alloy. Inorg Mater 52, 1077–1084 (2016). https://doi.org/10.1134/S002016851610006X
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DOI: https://doi.org/10.1134/S002016851610006X