Homogeneous Nucleation in a Liquid Metal

Ovsienko, D. E.

doi:10.1007/978-1-4615-7113-1_2

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Kinetic Model Of the Metastable Lanthanum Polytype Formation1

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2021

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“…The temperature dependences of the parameters I i , c , i R u i , which, in accordance with Eqs. ( 2)-( 4), control the crystallization kinetics of competing γ-, βand µ-phases, are set by the formulas of the classical crystallization theory for the mechanisms of homogeneous nucleation and normal growth of crystals [16,17]. Calculations of the frequency of formation of crystallization centres under conditions of melt rapid cooling are carried out considering the correction associated with the effect of the nonstationary distribution of heterophase fluctuations size using the method of [18]:…”

Section: Kinetic Model Of the Metastable Lanthanum Polytype Formationmentioning

confidence: 99%

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

Lysenko¹,

Zagorulko²,

Kalinina³

et al. 2021

Metallofiz. Noveishie Tekhnol.

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Using a mathematical model of competitive crystallization of polymorphic metals a numerical analysis of formation kinetics of the metastable polytype of lanthanum (µ-La), which is fixed in the products of quenching from the liquid state in a mixture with crystallization of the equilibrium f.c.c. βmodification, is carried out. The interval of rapidly quenched foils thicknesses is determined, within which the metastable µ-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 DG µβ = 5 J/mol, which has the meaning of the degree of metastability of µ-La.

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Section: Kinetic Model Of the Metastable Lanthanum Polytype Formationmentioning

confidence: 99%