Analysis of phase composition of the Al–Cu–Mn–Ca system as a base for heat-resistant aluminum alloys

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Abstract

The phase composition of the Al–Cu–Ca–Mn alloys containing (wt %) 6% Cu, 2% Mn, and to 4% Ca is analyzed. The Al–Cu–Ca–Mn phase diagram in the Al corner is proposed, according to which five four-phase regions with the participation of Al-based solid solution (Al) and various intermetallic compounds are possible to exist in the solid state. The Al–6% Cu–1% Ca–2% Mn composition is suggested as the base for developing new-generation heat-resistant (hot-strength) alloys. In the case of such contents of alloying elements, the combination of aluminum matrix containing Al20Cu2Mn3 dispersoids and (Al) + Al27Ca3Cu7 eutectic characterized by fine structure is possible.

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About the authors

N. A. Belov

National Research Technological University MISiS

Email: kovalev-andrey-i@mail.ru

кафедра обработки металлов давлением

Russian Federation, Moscow, 119049

A. I. Kovalev

South Ural State University

Author for correspondence.
Email: kovalev-andrey-i@mail.ru
Russian Federation, Chelyabinsk, 454080

D. A. Vinnik

South Ural State University; Moscow Institute of Physics and Technology, MIPT; St. Petersburg State University

Email: kovalev-andrey-i@mail.ru
Russian Federation, Chelyabinsk, 454080; Dolgoprudny, 141701; St. Petersburg, 198504

K. A. Tsydenov

National Research Technological University MISiS

Email: kovalev-andrey-i@mail.ru

кафедра обработки металлов давлением

Russian Federation, Moscow, 119049

S. O. Cherkasov

National Research Technological University MISiS

Email: kovalev-andrey-i@mail.ru

кафедра обработки металлов давлением

Russian Federation, Moscow, 119049

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Supplementary files

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2. Fig. 1. Microstructure of experimental alloys in the cast state, SEM: (a) 0Ca; (b) 0.5Ca; (c) 1Ca; (d) 2Ca; (d–f) 3Ca; (g–h) 4Ca.

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3. Fig. 2. The effect of calcium content in alloys of the Al–Cu–Ca–Mn system (at 6% Cu and 2% Mn) on the concentrations of copper and manganese in the aluminum solid solution in the cast state.

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4. Fig. 3. Maps of the distribution of elements in the microstructure of the cast alloy 2Ca, SEM (a), MRSA (b–d): b) Ca; c) Mn; d) Cu.

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5. Fig. 4. Microstructure of experimental alloys after annealing at 540°C (6 h), SEM: (a) 0.5Ca; (b) 1Ca; (c) 2Ca; (d) 3Ca.

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6. Fig. 5. Microstructure of experimental alloys after annealing at 580°C (6 h), SEM: (a) 1Ca; (b) 2Ca; (c) 3Ca; (d) 4Ca.

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7. Fig. 6. DSC heating and cooling curves of 0Ca (a), 1Ca (b) and 3Ca (c) alloys.

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8. Fig. 7. Predicted distribution of phase regions in the solid state in the Al–Cu–Mn–Ca system in the region of the aluminum angle.

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