Abstract
(Fe0.76Si0.09B0.1P0.05)99.3−xNbxCu0.7 (x = 0–1.5 at. %) bulk nanocrystalline alloys were prepared to investigate the alloying effects of Nb on glass forming ability, thermal stability, soft magnetic properties, and crystallization behavior. It was found that the amorphous forming ability was greatly improved with the addition of minor Nb. The thermal stability of Nb-containing alloy was significantly improved because the initial crystallization temperature and crystallization activation of the primary phase were obviously better than that of the Nb-free alloy. Further, the larger intervals of two-phase crystallization temperature and the significantly higher activation energy of crystallization of the second phase in the Nb-containing alloys favor the formation of a single α-Fe(Si) nanocrystalline structure. Moreover, Nb-containing alloys exhibit excellent soft magnetic properties, including high saturation magnetization of 1.42–1.49 T, low coercivity of around 1.0 A/m, and high permeability of about 18,000 at 1 kHz, which makes the alloys promising soft magnetic materials for industrial applications.
Highlights
IntroductionThe energy crisis is the most serious problem in the development of the current world
The energy crisis is the most serious problem in the development of the current world.to improve efficiency and reduce power consumption, higher saturation magnetization (Bs ) accompanied with excellent soft magnetic properties (SMPs) is strongly required for the magnetic materials used in electrical power supplies and a variety of other industries
The results show that the magnetic saturation of the alloy increased gradually with the increase of iron content, but the glass forming ability (GFA) of the alloy deteriorated seriously
Summary
The energy crisis is the most serious problem in the development of the current world. As recent studies pointed out, the size effects of large ductility and yield strength can be activated for nanoscale thin film metallic glasses and even for micronscale ribbon ones, which exhibit excellent magnetic properties such as much lower magnetic loss than that of their bulk counterpart [10,11] It is just thin film metallic glasses and small-scale ribbon ones that are widely used in the power and electronics industries because of their good machinability and formability. The glass forming ability (GFA) of these nanocrystalline alloys with high Bs is very low, with the critical diameter (Dcr ) of fully amorphous rods of no more than 1 mm This has seriously hindered their further applications, so it is necessary to improve their GFA and SMPs simultaneously.
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