REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

thermally induced crystallization of Co₇₀Fe₅Si₁₀B₁₅ amorphous alloy

milica M. vasić

Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia, mvasic@ffh.bg.ac.rs

RADOSLAV SURLA

Faculty of Technical Sciences, University of Kragujevac, Čačak, Serbia, ekorade@gmail.com

tomÁš žÁk

Institute of Physics of Materials AS CR, Brno, Czech Republic, zak@ipm.cz

NadĚžda pizÚrovÁ

Institute of Physics of Materials AS CR, Brno, Czech Republic, pizurova@ipm.cz

Dušan M. Minić

Military Technical Institute, Belgrade, Serbia, minicdusan@gmail.com

dragica M. minić

Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia, dminic@ffh.bg.ac.rs

Abstract: Thermal stability and crystallization of amorphous Co₇₀Fe₅Si₁₀B₁₅ alloy were studied using several methods of thermal and structural analysis. Structural stabilization of the alloy includes multistep crystallization process, during which fcc Co, hcp Co, Co₂₃B₆, and Co₂Si crystalline phases were formed. The microstructural parameters of the formed phases were determined after annealing at different temperatures ranging from 25 to 800 ^oC. Additional information on the microstructure of the fully crystallized alloy was obtained by TEM and EDX analyses. It was shown that the observed microstructural transformations significantly affect the magnetic properties of the alloy.

Keywords: amorphous alloy, microstructure, structural transformations, magnetic moment.