Abstract
Phase transformations of the 2.7Ni + 97.3Al eutectic alloy have been characterized by differential barothermal analysis (DBA) at temperatures of up to 750°C and pressures of up to ∼100 MPa. The results demonstrate that the Al matrix of the as-prepared alloy was saturated with micropores. After melting and crystallization in compressed argon, the micropore density increased. As a result of melting and solidification, the fine-grained structure of the as-prepared alloy transformed to a macrocrystalline, dendritic structure. Electron microscopy was used to determine the volume fraction of the intermetallic phase NiAl3 in the Al matrix. Supersaturated solid solutions of nickel in aluminum decompose at 626°C to give a mixture of Al〈Ni〉 and NiAl3. At 100 MPa, the nickel-aluminum solid-solution range extends to 2.7–2.8 at % Ni, and the nickel content at the eutectic point may reach 3.1–3.3 at %. The Al and NiAl3 in the alloy solidified at 100 MPa had reduced lattice parameters. We determined the microhardness of the Al matrix after DBA.
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Original Russian Text © A.G. Padalko, G.V. Talanova, E.Yu. Ponomareva, V.V. Talyat-Kelpsh, L.I. Shvorneva, G.I. Zubarev, V.T. Fedotov, A.N. Suchkov, V.A. Baklan, 2012, published in Neorganicheskie Materialy, 2012, Vol. 48, No. 6, pp. 674–680.
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Padalko, A.G., Talanova, G.V., Ponomareva, E.Y. et al. Barothermal analysis and structure of the eutectic Al-Ni (2.7 at % Ni) alloy. Inorg Mater 48, 582–587 (2012). https://doi.org/10.1134/S0020168512060143
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DOI: https://doi.org/10.1134/S0020168512060143