Peculiarities of the Transition to an Equilibrium State of Mechanically Alloyed Fe/Amorphous Phase Fe-B/B Nanocomposite with Composition Fe(68)B(32) upon Thermal Treatment

Abstract

The methods of X-ray diffraction, Mössbauer spectroscopy, and magnetic measurements are employed to study the structural and phase transformations in the course of isochronous (1 h) annealing at 300-900 ° C and isothermal (350 ° C) annealing of a mechanically alloyed Fe/amorphous phase Fe-B/B s nanocomposite with a total boron content of 32 at %. Common and specific regularities are established for the sequence of solid-phase reactions as compared to amorphous Fe-B alloys prepared by melt quenching. The observed differences are explained by a high thermal stability of the nanostructure in the mechanically alloyed Fe-B system due to the presence of boron atoms B s segregated at the intergrain boundaries.