In the work the mechanism of the equilibrium and non-equilibrium crystallization of the alloys in the ternary system with the monovariant eutectic equilibrium has been investigated. New peculiarities of the equilibrium crystallization of the binary eutectics in the ternary systems have been found out. It is shown that the equilibrium crystallization of the binary eutectics in the ternary systems is going by the diffusion decomposition of the liquid phase (MDEC) and the changing of the compositions of the previously precipitated solid phases to the new equilibrium one owing to the diffusion interaction with the liquid phase (MINT). A new method of the graphic representation of the element phase equilibrium in the ternary system with the eutectic equilibrium is proposed. Analytical relations have been deduced which make possible to determine the main indices of the equilibrium crystallization of the binary eutectic alloys in the ternary systems MDEC, MINT, i(dm/dt) – crystallization rate at the liquid and solid. Calculations of the equilibrium and non-equilibrium crystallization of the alloys in the Al-Si-Ge system were done using the Thermo-Calc program and experimental investigations of the alloys of this system were carried out.Keywords: ternary system, crystallization, binary eutectic, diffusion decomposition, diffusion interaction
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