Abstract
Glass formability and phase transformations in rapidly quenched ferromagnetic nano-structured (Fe85B15-xSix)98-yC2Cuy (where x=0; 5 and y=0; 1) systems were investigated. The consecutive crystallization stages of bcc-Fe and borides were determined by resistometry, differential scanning calorimetry and by thermogravimetry, where the values of important transformation parameters were estimated and mutually correlated with the results from the structure analysis by TEM and XRD. Morphology of the nano-sized Fe grains in amorphous matrix and their transformation to borides matrix was observed by TEM in dependence on the chemical composition and thermal treatment. The effects of systematic alloying on the transformation process and on the resulting structure have been correlated with selected magnetic properties of the samples after suitable annealing.
Highlights
Nanocrystalline soft magnetic Fe-B-(Si) based alloys due to their structure and chemical composition exhibit useful magnetic benefits such as a high saturation magnetic flux density (BS), high permeability and low coercive force (HC) as well as almost zero magnetostriction (λ)
A proper combination of these alloying elements into the eutectic Fe-B system can lead to the improved glass forming ability and resulting physical properties, which depend on the final crystalline structure and its proportion to the amorphous matrix: the important and requested properties depend on the final structure of ferromagnetic crystals as well as on their volume content in the remaining amorphous matrix
In this work we studied the physical properties – transformation of ferromagnetic phases in (Fe85B15-xSix) 98-yC2Cuy systems, where x=0; 5 and y=0; 1 with the aim to maintain the quality found in systems containing more expensive additions
Summary
Nanocrystalline soft magnetic Fe-B-(Si) based alloys due to their structure and chemical composition exhibit useful magnetic benefits such as a high saturation magnetic flux density (BS), high permeability (μE) and low coercive force (HC) as well as almost zero magnetostriction (λ). Alloying with Si and Cu is known to improve magnetic and thermal properties of this system, making these nanostructured materials suitable for many electrical, magnetic and other power applications with lowered material cost[6,7,8,9,10]. These additions into the Fe-B system improve the glass forming ability and the resulting physical properties. The compositional tuning of the Curie temperature TC of the amorphous phase, the onset of
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