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

摘要

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 primary crystallization of the following Fe-containing phases is most probable: in silumins these are the Al_5FeSi and Al_(15)(Fe, Mn)_3Si_2 phases and in magnaliums and the AM5-type alloys these are Al_3Fe and Al_6(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.