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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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