Influence of deformation and annealing on the structure, electrical resistance and hardness of the Al–4 %Cu–3 %Mn alloy casted in an electromagnetic crystallizer

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Abstract

Using computational and experimental methods, the influence of deformation-heat treatment on the structure, electrical resistance and hardness of the Al–4 %Cu–3 %Mn alloy produced by casting in an electromagnetic crystallizer was studied. It has been shown that at a cooling rate of more than 1000 K/s, the entire amount of manganese and half of the total copper content are dissolved in the aluminum solid solution, which allows, with subsequent deformation-thermal treatment, to form a structure with the maximum possible number of Al20Cu2Mn3 dispersoids, which allows achieving significant increasing heat resistance compared to known alloys of the Al–Cu–Mn system.

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About the authors

N. A. Belov

National Research Technological University MISiS

Email: ch3rkasov@gmail.com

кафедра обработки металлов давлением

Russian Federation, Moscow, 119047

S. O. Cherkasov

National Research Technological University MISiS

Author for correspondence.
Email: ch3rkasov@gmail.com

кафедра обработки металлов давлением

Russian Federation, Moscow, 119047

N. O. Korotkova

National Research Technological University MISiS

Email: ch3rkasov@gmail.com

кафедра обработки металлов давлением

Russian Federation, Moscow, 119047

M. M. Motkov

Siberian Federal University

Email: ch3rkasov@gmail.com

кафедра электротехники

Russian Federation, Krasnoyarsk, 660041

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Supplementary files

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2. Fig. 1. Initial bar blanks (a) and cold-rolled alloy strips (b).

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3. Fig. 2. Calculated isothermal sections of the Al–Cu–Mn system at 350 °C (a) and 425 °C (b) and curves of nonequilibrium crystallization according to the Sheil-Gulliver model (dependence of the total fraction of solid phases Q on temperature) (c – all phases are included in the calculation, d – Mn-containing phases are excluded).

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4. Fig. 3. The structure of the cast billet (a, b) and cold-rolled tape (c, d) obtained from the cast EMC billet according to the 425S mode (see Table 2).

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5. Fig. 4. The structure of the cast billet (a, d), cold–rolled strips 350S (b, e) and 425S (c, e) after annealing at 450 °C (a–c) and 550 °C (d-e).

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6. Fig. 5. The effect of the annealing temperature on the electrical resistivity (a) and hardness (b) of the cast workpiece and cold-rolled strips.

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7. Fig. 6. Comparison of the calculated and experimental dependences of the electrical resistivity of cold-rolled strips on the annealing temperature.

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8. Fig. 7. The effect of the annealing duration at 350 °C on the electrical resistivity (a) and hardness (b) of the cold-rolled strip.

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