Kinetics of Competitive Crystallization of Lanthanum upon Rapid Cooling of the Melt

A. B. Lysenko$^{1}$, I. V. Zagorulko$^{2}$, T. V. Kalinina$^{1}$, O. A. Zadorozhnia$^{1}$

$^{1}$Dniprovsk State Technical University, 2 Dniprobudivska Str., UA-51918 Kamianske, Ukraine
$^{2}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 02.07.2021. Download: PDF

Using a mathematical model of competitive crystallization of polymorphic metals a numerical analysis of formation kinetics of the metastable polytype of lanthanum ($\mu$-La), which is fixed in the products of quenching from the liquid state in a mixture with crystallization of the equilibrium f.c.c. $\beta$-modification, is carried out. The interval of rapidly quenched foils thicknesses is determined, within which the metastable $\mu$-phase is formed in quantities sufficient for experimental detection. The calculated data agree with the results of X-ray phase analysis at the physically correct value of the free parameter of the model $\Delta$G$_{\mu\beta}$ = 5 J/mol, which has the meaning of the degree of metastability of $\mu$-La.

Key words: melt quenching of lanthanum, competitive crystallization, metastable polytype, formation kinetics.

URL: https://mfint.imp.kiev.ua/en/abstract/v43/i09/1207.html

DOI: https://doi.org/10.15407/mfint.43.09.1207

PACS: 61.25.Mv, 61.43.Bn, 64.60.My, 64.70.dg, 81.07.Bc, 81.10.Fq, 81.30.Hd

Citation: A. B. Lysenko, I. V. Zagorulko, T. V. Kalinina, and O. A. Zadorozhnia, Kinetics of Competitive Crystallization of Lanthanum upon Rapid Cooling of the Melt, Metallofiz. Noveishie Tekhnol., 43, No. 9: 1207—1224 (2021)


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