The Kinetic Peculiarities of the Nanocrystallization of Amorphous Alloys Fe84Nb2B14, which are Doped by Rare Earth Metals

L. Boichyshyn; M.-O. Danyliak; B. Kotur; T. Mika

doi:10.15330/pcss.18.1.122-128

Authors

L. Boichyshyn Ivan Franko National University of Lviv
M.-O. Danyliak Ivan Franko National University of Lviv
B. Kotur Ivan Franko National University of Lviv
T. Mika lboichyshyn@yahoo.com

DOI:

https://doi.org/10.15330/pcss.18.1.122-128

Keywords:

Amorphous alloys, Crystallization, Kinetics models, Activation energy

Abstract

The thermal stability and crystallization of the Fe₈₂Nb₂B₁₄RE₂ (RE = Y, Gd, Tb, Dy) amorphous alloys were investigated by differential scanning calorimetric (DSC) method. By X-ray diffraction (XRD) method has been established that the initial AMA have amorphous structure. The RE alloying of Fe₈₂Nb₂B₁₄RE₂ amorphous alloys increase the nanocrystallization temperatures for ~ 110 K and activation energies of crystallization for ~ 330 kJ/mol. The Avrami constant was found to be 1.86 for Fe₈₄Nb₂B₁₄ at 703 K, 1.17 for Fe₈₂Nb₂B₁₄Y₂ at 813 K, 1.36 for Fe₈₂Nb₂B₁₄Gd₂ at 808 K, 1.76 for Fe₈₂Nb₂B₁₄Tb₂ at 808 K and 1.92 for Fe₈₂Nb₂B₁₄Dy₂ at 808 K. Two-dimensional diffusion controlled growth mechanism with decreasing nucleation rate was observed in the alloys.

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