• Kepaptsoglou, Dm
• Hristoforou, E.
• Muller, D.
• Skorvanek, I.
• Janickovic, D.
• Deanko, M.
• Svec, P.

Abstract

<p>The effect of addition of Si and variation of the Fe/Co ratio on the evolution of the nanostructure was studied in a modification of the Fe-Nb-B system. The entire system (Fe, Co)₇₃Nb₇(Si, B) ₂₀ was prepared in an amorphous state by rapid quenching using the planar flow casting method over a wide range of Fe/Co atomic ratios, ranging from 0 to 1. Nanocrystallization was investigated by evolution of the electrical resistivity with time and temperature. The microstructural analysis was performed using transmission electron microscopy as well as electron and X-ray diffraction. The results from microscopy observations were used to determine the distribution of grain size, which in these alloys attain very small dimensions of ∼5-8 nm. New algorithms of microscope image analysis were used for grain size determination, crucial for quantifying the microprocesses controlling nucleation and growth from the amorphous rapidly quenched phase.</p>

Topics

• amorphous
• grain
• resistivity
• grain size
• phase
• x-ray diffraction
• transmission electron microscopy
• casting
• quenching