National University of Science and Technology MISIS, Moscow, Russia

N. А. Belov, Chief Researcher of the Department of Metal Pressure Treatment, Doctor of Technical Sciences, Professor, nikolay-belov@yandex.ru
К. А. Tsydenov, Scientific Project Engineer of the Department of Metal Pressure Treatment, kirillcydenov@yandex.ru
S. О. Cherkasov, Scientific Project Engineer of the Department of Metal Pressure Treatment, cherkasov@gmail.com
А. N. Коshmin, Associate Professor, Candidate of Technical Sciences, koshmin.an@misis.ru

Using t he example of hot and cold rolled sheets, the effects of calcium on the structure, deformation adaptability and mechanical properties of aluminum alloys containing 6% (wt.) Cu and 2% (wt.) Mn have been studied. The objects of the study are four experimental alloys containing 6% Cu, 2% Mn, and the concentration of calcium varies from 0 to 4%. Flat ingots of experimental alloys measuring 10×40×180 mm, obtained by casting into a graphite mold, have been subjected to hot rolling at 450 оC to a thickness of 2 mm, and then to cold rolling to a thickness of 1 mm. The microstructure of the alloy containing 1% Ca is pre-eutectic, while the proportion of eutectic is more than half, and its structure is quite thin. This eutectic can be identified as (Al) + Al27Ca3Cu7. Alloys containing 2 and 4% Ca contain primary crystals of the compact Al27Ca3Cu7 compound, as well as eutectic, which can be identified as (Al) + Al27Ca3Cu7 + (Al, Cu)4Ca. The deformation adaptability of alloys containing up to 2% Ca is sufficient for both hot and cold rolling. A comparison with the base composition of 2 % Cu and 2 % Mn shows a noticeable increase in the strength of the alloy with the addition of 1 % Ca: the values of σ_в and σ_0.2 are higher by 15 and 28%, respectively. Based on the data obtained, the composition of Al – 6% Cu – 2 % Mn – 1 % Ca has the best combination of deformation adaptability and mechanical properties.

The work was supported by the Russian Science Foundation grant No. 25-19-00002.

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