Abstract
Soft magnetic nanocrystalline alloys have been widely analysed and studied during the past years. However, optimisation of specific chemical compositions is still being developed. The applicability of these soft nanocrystalline alloys depends mainly on the presence of the desired nanocrystalline phases within the alloy. In this study, the analysed alloys are manufactured by mechanical alloying. The analyses performed on the samples include a microstructural analysis, a thermal analysis, and a complementary functional analysis in the form of the thermomagnetic response of some samples. Regarding Fe-based alloys, thermal stability for samples containing B was higher than those containing P (crystal growth peaks in the range between 895–905 K and 775–800 K respectively). The higher magnetization of saturation, Ms, was found in Fe–Mn alloys, whereas the addition of boron provoked a decrease of Ms and the nanocrystals size.
Highlights
In a constantly evolving technological era, the demand for the development and manufacturing of advanced materials is on the rise
The results show h heat flow for B9-40 increases progressively at a temperature below the crystal peak, while for B9-100, heat flow variation is not significant before reaching the growth peak temperature
The principal aim of the study was to check the thermal and magnetic behaviour and to determine the effects that chemical composition have on Fe-based alloys
Summary
In a constantly evolving technological era, the demand for the development and manufacturing of advanced materials is on the rise. The relevance in the study of these alloys is related to the wide range of applicability in: sensors, transformer cores, and magnetic actuators [1,2,3]. These applications are based on the properties of these alloys, including low coercivity and high magnetoresistance [4,5,6]. This study concentrates on three families of soft magnetic nanocrystalline (cubic crystallographic phase): Fe–Nb-based and Fe–Mn. Fe–Nb Finemet-based alloys are candidates for sensors and transformer cores [7], and Fe–Mn for motor-driven applications [8]. In the case of B addition, phases such as Fe2B or Fe3B may appear due to the manufacturing conditions of the alloy [14]
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