Аннотация
The article presents an analysis of the diagram of the state of the Al – Fe – Si system using the Thermo-Calc program: polythermal sections were constructed and analyzed in order to determine the concentration limits of the appearance of primary crystals of Fe-containing phases, the mass fractions of phases at certain temperatures were calculated. A search was performed for optimal concentrations and temperatures at which the formation of a highly symmetric Al8Fe2Si phase capable of perceiving plastic deformation takes place. The Al-30Fe-9Si-1B system was also investigated. Based on the calculation of the parameters of the primary crystallization of iron in Al – Fe – Si alloys, the possibility of evaluating the effectiveness of modifying this alloy with boron is shown. The boron additive was considered as a modifier contributing to the grinding of aluminium grains and the formation of a wide area of existence of the Al8Fe2Si phase. The concentration and temperature ranges at which the maximum number of phases Al8Fe2Si and AlB2 can be achieved have been determined. The minimum amount of the Al9Fe2Si2 phase has been calculated, which is undesirable because it leads to a decrease in the mechanical properties of the alloy. From a practical point of view, the complex of proposed studies will allow to scientifically substantiate and develop new technologies for the production and processing of semi-finished products and finished products from aluminium-based alloys and functional materials with a given structure.