Quantitative Analysis of the Primary Crystallization
of Iron-Containing Phases as Applied to Aluminum Alloys
of Various Doping Systems

N. A. Belov

National University of Science and Technology “MISiS”, Leninskii pr. 4, Moscow, 119049 Russia

e-mail: nikolay-belov@yandex.ru

Abstract—Aluminum-based multicomponent systems are analyzed using the Thermo-Calc program in order
to determine the concentration boundaries in which the first primary crystals of Fe-containing phases appear.
Projections of the liquidus surfaces are calculated as applied relative to the industrial cast alloys of three main
groups, namely, Al–Si (silumins), Al–Cu (the AM5 type), and Al–Mg (magnaliums). It is shown that the pri-
mary crystallization of the following Fe-containing phases is most probable: in silumins these are the Al₅FeSi
and Al₁₅(Fe, Mn)₃Si₂ phases and in magnaliums and the AM5-type alloys these are Al₃Fe and Al₆(Fe, Mn)
phases. Based on the calculation of parameters of the primary crystallization of the Fe-containing phases, the
possibility of evaluating the efficiency of iron removal from aluminum alloys is shown.

Keywords: phase diagrams, primary crystallization, Fe-containing phases in aluminum alloys

DOI: 10.3103/S1067821213040032

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