The model of microcrystallization of 50 % binary metallic melts in the diffusive relaxation mode

  • Yury A. Baikov D. Mendeleev University of Chemical Technology of Russia 9, Miusskaya sq., 125047 Moscow, Russian Federation
  • Nikolai I. Petrov D. Mendeleev University of Chemical Technology of Russia 9, Miusskaya sq., 125047 Moscow, Russian Federation
  • Margorita I. Timoshina Moscow Technical University of Communications and Informatics 8а, Aviamotornaya str., 111024 Moscow, Russian Federation Cand. Sci (Tech.) Associate Professor, Physics Department, Moscow Technical University of Communications and Informatics, Moscow, Russian Federation; e-mail: ritatoo@rambler.ru. ORCID iD 0000-0001-8954-0473.
  • Evgeniy V. Akimov Moscow Technical University of Communications and Informatics 8а, Aviamotornaya str., 111024 Moscow, Russian Federation
DOI: https://doi.org/10.17308/kcmf.2019.21/711
Keywords: diphase transition region,, growth monomers,, a far-order parameter,, the growth,, the “roughness” parameter,, the crystallization rate

Abstract

Objective. This research investigates the model of microcrystallization of 50% binary metallic melts in the diffusive-relaxation procedure. The authors developed a scheme of a diphase transition region (DTR) defined in the concentration space of selected growth monomers.

Methods and methodology. The concentration of growth monomers belonged to two different aggregate states: the melt and the crystalline phase. A kinetic differential-difference equation describing the time evolution of the DTR structure was developed. The study used the model of discontinuous DTR configuration formed by the fluctuation mechanism of the above-mentioned concentrations of growth monomers of a limited spectrum. The DTR separates two massive adjoining phases – the binary melt and the crystal.

Results. Using approximate nearest neighbours the study defined the frequencies of the growth monomer exchange between the two adjoining massive phases, the binary melt and the crystal, as functions of their interaction energies and the temperature of the crystallizing system. This model corresponds to the real length interface of two contiguous phases, and is known as the Kossel-Stranski crystal.

Conclusion. The average crystallization rate of so-called diphase transition region (DTR) in the concentration space of growth monomers was recorded. The definition of diphase transition region kinetics took into account the principal peculiarities of the concentrations of spontaneous fluctuations of limited spectrum, i.e. its discontinuous form. Moreover, some problems associated with the order-disorder processes in binary crystalline phases were considered.

 

CONFLICT OF INTEREST

The authors declare the absence of obvious and potential conflicts of interest related to the publication of this article.

 

 

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Published
2019-03-05
How to Cite
Baikov, Y. A., Petrov, N. I., Timoshina, M. I., & Akimov, E. V. (2019). The model of microcrystallization of 50 % binary metallic melts in the diffusive relaxation mode. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 21(1), 4-15. https://doi.org/10.17308/kcmf.2019.21/711
Issue
Vol 21 No 1 (2019)
Section
Статьи
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