COMPARATIVE ANALYSIS OF THERMAL STABILITY OF AMORPHOUS STRUCTURE IN Fe40Ni40P14B6 AND Fe48Co32P14B6 METALLIC GLASSES

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Abstract

Crystallization kinetics of Fe40Ni40P14B6 and Fe48Co32P14B6 glasses at isothermal conditions was investigated in the temperature ranges of 617–662 and 683–714 K, respectively. The onset crystallization times were used as indicators of thermal stability. The transient behavior of crystal nucleation was established in the framework of the Kolmogorov–Johnson–Mehl–Avrami model and the combined Kolmogorov–Kashchiev model and both the degrees of non-stationarity and the times characterizing crystallization kinetics at steady-state and transient nucleation were determined. The temperature dependencies of the effective diffusivity governing transfer atoms across the interfaces and steady-state nucleation rates were calculated using the characteristic steady-state crystallization times and values of the crystal growth rates known from the literature. From these data the temperature dependencies of both the work of critical nucleation formation and the specific free energy of nucleus/matrix interface were found in the framework of the classical equation of homogeneous nucleation rate. From comparison between the experimentally measured and calculated for steady-state nucleation onset crystallization times it was established that the enhanced thermal stability of Fe48Co32P14B6 compared with that of Fe40Ni40P14B6 was caused by the lowered diffusion mobility and the higher degree of deviation of nucleation rate from its steady-state value.

About the authors

E. A. Sviridova

Galkin Donetsk Institute for Physics and Engineering; Donbass National Academy of Civil Engineering and Architecture

Email: ksvir@list.ru
Donetsk, 283048 Russia; Makeevka, 286123 Russia

S. V. Vasiliev

Galkin Donetsk Institute for Physics and Engineering; Donbass National Academy of Civil Engineering and Architecture

Email: ksvir@list.ru
Russian Federation, Donetsk, 283048 Russia; Makeevka, 286123 Russia

V. I. Tkatch

Galkin Donetsk Institute for Physics and Engineering

Author for correspondence.
Email: ksvir@list.ru
Russian Federation, Donetsk, 283048 Russia

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