Combined effect of calcium and silicon on phase composition and structure of Al–10%Mg alloy
https://doi.org/10.17073/0021-3438-2017-6-53-62
Abstract
Phase transformations in the Al–Ca–Mg–Si system in the area of aluminum-magnesium alloys were studied using the Thermo-Calc program. The liquidus projection was constructed for this quaternary system at 10 % Mg. It was shown that the following phases can crystallize primarily at 10 % Mg depending on calcium and silicon concentrations (except for the aluminum solid solution (Al)): Al4Ca, Mg2Si and Al2CaSi2. The pattern of quaternary alloy crystallization was studied using a polythermal cross section calculated at 10 % Mg and 84 % Al. It was assumed based on the analysis of phase transformations taking place in the alloys of this section that the Al–Al2CaSi2–Mg2Si quasiternary cross section is present in the Al–Ca–Mg–Si system. 3 experimental alloys were considered for the quantitative analysis of phase composition, namely Al–10%Ca–10%Mg–2%Si, Al–4%Ca–10%Mg–2%Si and Al–3%Ca–10%Mg–1%Si. Metallographic studies and electron probe microanalysis (EPMA) were carried out using the TESCAN VEGA 3 scanning electron microscope. Critical temperatures were determined using the DSC Setaram Setsys Evolution differential calorimeter. The results of the experiments are in good agreement with the calculated data. In particular, a peak at t ~ 450 °C is detected in all alloys, which corresponds to the temperature of the nonequilibrium solidus and the invariant eutectic reaction L → (Al) + Al4Ca + Mg2Si + Al3Mg2.
It is found that the structure of the Al–3%Ca–10%Mg–1%Si alloy is closest to that of the eutectic alloy. In terms of density and corrosion resistance, it is not inferior to the AMg10 alloy and even superior in hardness. Therefore, this alloy can be considered as a basis for creating new «natural composite» cast materials.
About the Authors
N. A. Belov
National University of Science and Technology (NUST) «MISIS»
Russian Federation
Russian Federation
Dr. Sci. (Tech.), Prof., Department of metal forming, National University of Science and Technology (NUST) «MISIS»
119049, Russia, Moscow, Leninskiy pr. 4
E. A. Naumova
National University of Science and Technology (NUST) «MISIS»
Russian Federation
Russian Federation
Cand. Sci. (Tech.), Lead engineer, Department of metal forming, NUST «MISIS»
119049, Russia, Moscow, Leninskiy pr. 4
V. V. Doroshenko
National University of Science and Technology (NUST) «MISIS»
Russian Federation
Russian Federation
Graduatestudent, Department of metal forming, NUST «MISIS».
119049, Russia, Moscow, Leninskiy pr. 4
N. N. Avxentieva
National University of Science and Technology (NUST) «MISIS»
Russian Federation
Russian Federation
Senior teacher, Department of mathematics, NUST «MISIS»
119049, Russia, Moscow, Leninskiy pr. 4
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Review
For citations:
Belov N.A., Naumova E.A., Doroshenko V.V., Avxentieva N.N. Combined effect of calcium and silicon on phase composition and structure of Al–10%Mg alloy. Izvestiya. Non-Ferrous Metallurgy. 2017;(6):53-62. (In Russ.) https://doi.org/10.17073/0021-3438-2017-6-53-62
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