Теория метастабильной кристаллизации переохлажденного эвтектического расплава

M. V. Dudorov; A. V. Drozin; A. V. Stryukov; V. E. Roshchin

Authors

M. V. Dudorov South Ural State University
A. V. Drozin South Ural State University
A. V. Stryukov OJSC “Ashinsky Metallurgical Plant”
V. E. Roshchin South Ural State University

Keywords:

growth theory, crystal growth, metastable phase, diffusionless growth, amorphous metals, nanocrystalline iron-boron alloys

Abstract

A new theory of crystallization of a supercooled metastable melt, based on the variational principles of mechanics, was developed. The theory takes into account the regularities of the diffusion growth of equilibrium crystals, as well as the regularities the diffusionless growth of metastable crystals. Mathematical modeling showed that in the supercooled melt Fe₈₃B₁₇ there is simultaneous nucleation and growth of the stable Fe and Fe₂B phases with the metastable Fe₃B phase. The growth rate of crystals of near-critical sizes of the Fe₃B phase exceeds the growth rate of the Fe and Fe₂B crystals. For the Fe₃B crystals the effect of diffusionless growth has been observed; in this case, the rapidly growing surface of the Fe₃B crystal captures the boron atoms.

On the basis of the developed theory, a quasi-equilibrium phase diagram for a supercooled Fe-B melt was constructed. The phase diagram takes into account both the equilibrium crystal growth and the growth of the metastable phase. The resulting diagram makes it possible to predict the values of the concentration of components at the surface of growing crystals for the Fe and Fe₂B crystals, for which the condition of local equilibrium is observed on their surface, and for the metastable Fe₃B crystals, whose diffusionless growth is due to the high speed of the crystal surface movement.

The performed mathematical modeling of the nucleation and growth of crystals in the overcooled eutectic melt Fe₈₃B₁₇ showed that in a supercooled melt there is simultaneous nucleation and growth of the stable Fe and Fe₂B phases with the metastable Fe₃B phase. The regularities of nucleation and growth of the metastable Fe₃B phase have been studied. The growth mechanism of the Fe₃B nuclei differs from the growth of the Fe and Fe₂B nuclei due to diffusionless capture of the boron atoms by the growing surface of the Fe₃B crystals.

Author Biographies

M. V. Dudorov, South Ural State University

кандидат физико-математических наук, старший научный сотрудник кафедры пирометаллургических процессов

A. V. Drozin, South Ural State University

доктор технических наук, профессор кафедры пирометаллургических процессов

A. V. Stryukov, OJSC “Ashinsky Metallurgical Plant”

начальник заводской лаборатории

V. E. Roshchin, South Ural State University

доктор технических наук, профессор, главный научный сотрудник кафедры пирометаллургических процессов

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