Effect of Cа addition on the phase composition and properties of low-alloyed Al–Mn–Fe alloys

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The phase composition of Al–Ca–Mn–Fe-based aluminum alloys with an unchanged Ca content of 2 wt % and variable Mn (0.5 and 1wt %) and Fe (0.1 and 0.3 wt %) contents is analyzed using calculations and experimental methods. Scanning electron microscopy and electrical resistivity and hardness measurements are used to estimate changes in the phase compositions of experimental alloys with the cast and deformed microstructure (ε = 80%) after annealing in a temperature range of 300–600°C.

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N. Korotkova

National University of Science and Technology MISiS

编辑信件的主要联系方式.
Email: n.korotkova@misis.ru
俄罗斯联邦, Moscow, 119049

S. Cherkasov

National University of Science and Technology MISiS

Email: n.korotkova@misis.ru
俄罗斯联邦, Moscow, 119049

N. Avxent’ieva

National University of Science and Technology MISiS

Email: n.korotkova@misis.ru
俄罗斯联邦, Moscow, 119049

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2. Fig. 1. Isothermal section of the Al–Ca–Mn–Fe phase diagram at 2% Ca and 600°C with the designation of experimental alloys (Al4–Al4Ca, Al10(Fe)–Al10CaFe2, Al10(Mn)–Al10CaMn2).

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3. Fig. 2. Microstructure of experimental alloys: 203 (a, d), 210 (b, d) and 211 (c, e): (a, b, c) – as-cast condition, (d, d, e) – after annealing T550 (see Table 2).

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4. Fig. 3. Microstructure of alloys 203 (a), 250 (b) and 253 (c) (see Table 2) after slow cooling.

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5. Fig. 4. Predicted phase distribution in the solid state (a) and polythermal projection (b) of the aluminum angle of the Al–Ca–Mn–Fe phase diagram.

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6. Fig. 5. Dependence of specific electrical resistance (ρ) (a, b) and hardness (HV) (c, d) on the annealing temperature for cold-rolled sheets (a, c) and ingots (b, d).

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