Phase composition and structure of Al–Cu–Mn–Mg–Zn–Fe–Si alloys containing 2% Cu and 1.5% Mn

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Abstract

Calculations and experimental methods are used to study the collective and individual effect of Zn, Mg, Fe, and Si additions on the phase composition and structure of cast and cold-rolled aluminum alloys containing 2% Cu and 1.5% Mn. The combined additions of these elements of more than 3% to the base alloy were found to allow the mechanical properties of cold-rolled alloys to be kept at a level of properties of deformed base alloy despite the substantial complication of the phase composition. This largely is due to the completely fixing iron into the eutectic inclusions of the Al15(Fe,Mn)3Si2 phase. From this, it follows the fundamental possibility of using a variety of secondary raw materials for the preparation of this alloy, which does not require homogenizing and quenching.

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K. A. Tsydenov

National University of Science and Technology MISiS

Author for correspondence.
Email: kirillcydenov@yandex.ru

кафедра обработки металлов давлением

Russian Federation, Moscow, 119049

N. A. Belov

National University of Science and Technology MISiS

Email: kirillcydenov@yandex.ru

кафедра обработки металлов давлением

Russian Federation, Moscow, 119049

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Supplementary files

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2. Fig. 1. Polythermal sections of the Al–Cu–Mn–Fe–Si–Mg–Zn system at 2%Cu, 1.5%Mn, 0.4%Fe and 0.4%Si: (a) at 1%Zn; (b) at 1%Mg.

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3. Fig. 2. Polythermal sections of the Al–Cu–Mn–Fe–Si–Mg–Zn system at 2%Cu, 1.5%Mn, 1%Mg and 1%Zn: (a) at 0.4%Si, (b) at 0.4%Fe.

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4. Fig. 3. Calculated dependences of the mass fraction of solid phases (Q) on temperature during nonequilibrium crystallization for experimental alloys (see Table 1): (a) A-0; (b) A-1; (c) A-2; (d) A-3. For phase designations, see Figs. 1, 2.

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5. Fig. 4. Microstructure of ingots of experimental alloys, SEM: (a) A-0; (b) A-1; (c) A-2; (d) A-3.

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6. Fig. 5. Maps of the distribution of elements in the microstructure of the A-3 alloy ingot, MRSA.

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7. Fig. 6. Isothermal sections of the Al–Cu–Mn–Mg–Zn (a), Al–Cu–Mn–Fe–Si (b) and Al–Cu–Mn–Fe–Si–Mg–Zn (c, d) systems at 2%Cu, 1.5%Mn and 400°C: c) at 0.5%Fe and 0.4%Si; d) at 1% Mg and 1% Zn.

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8. Fig. 7. Microstructure of cold-rolled sheets of experimental alloys after annealing at 400°C, SEM: (a) A-0; (b) A-1; (c) A-2; (d) A-3.

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9. Fig. 8. Al20Cu2Mn3 dispersoids in the structure of annealed cold-rolled sheet of A-2 alloy, TEM: (a), (c) bright-field images; (b) dark-field image in the Al20Cu2Mn3 reflection.

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