Abstract
The correlation between structural relaxation process and the change in magnetic permeability of the Fe73.5Cu1Nb3Si15.5B7 amorphous alloy under the thermal influence
Highlights
Amorphous metallic alloys (AMA) represent one of the classes of new materials, which thanks to their extraordinary properties have become applicable in almost all branches of technology, especially in electrical engineering (BERNAL, 1960; TAKAYAMA, 1976)
differential scanning calorimetry method (DSC) thermogram shows that the temperature range before the crystallization from 150oC to 520oC can be split into structural relaxation region (150oC–440oC) and supercooled liquid region, which is in correlation with the measurement results ρ(T)
The biggest decrease in electrical resistivity occurs in the range of temperature crystallization, because the crystallization process is followed by the changes in electronic structure and the increase in the number of free electrons due to reduced number of covalent bonds, as well as the increased electron mean free path in the crystal state
Summary
Amorphous metallic alloys (AMA) represent one of the classes of new materials, which thanks to their extraordinary properties have become applicable in almost all branches of technology, especially in electrical engineering (BERNAL, 1960; TAKAYAMA, 1976) It is a group of amorphous materials most oftenly obtained through quenching of the melts obtained by means of alloying of transitive metals (TM: Fe,Ni,Co,Ti,Mo,Nb,V,Cr,Zr,Pd), which possess magnetic and electrical properties, with metaloids (M: B,Si,P,C,Ge) which are supposed to slow down the crystalization process during the solidification of the melts. The sinthesis of amorphous soft magnetic alloys, obtained through melt quenching technique requires proper composition of the alloy This ensures improved levels of the properties, such as a high glass-forming ability, good casting properties of the alloy which in turn determines the surface quality and uniformity of the melt-spun ribbons, as well as an enhanced thermal stability of both magnetic properties and amorphous structure (RAVAL, et al, 2005; MARIČIĆ, et al, 2008; MINIĆ et al, 2009a). The researches show that magnetic properties after the crystallization process are weakened or improved provided nanocrystal phases are formed (HENDERSON, 1979; MATUSITA and SAKKA, 1980; MINIĆ et al, 2009b)
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