As-cast nanocrystalline glass-coated microwires

• Published in: Journal of alloys and compounds Vol. 615; pp. S265 - S268
• Main Authors: Corodeanu, S., Ababei, G., Lupu, N., Óvári, T.-A., Chiriac, H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier B.V 05.12.2014; Elsevier
• Subjects: Alloys; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cooling; Exact sciences and technology; Magnetic properties; Magnetic properties and materials; Magnetic properties of monolayers and thin films; Magnetic properties of nanostructures; Magnetic properties of surface, thin films and multilayers; Magnetization processes; Magneto-impedance; Melts; Microstructure; Nanocrystalline materials; Nanocrystals; Physics; Rapid solidification; Shells; Wire; Magnetization processes; Magneto-impedance; Microstructure; Nanocrystalline materials; Rapid solidification; Drawing; Cooling; Magnetization; Glass coated microwire; Magnetoresistance; Nanocrystal; Iron base alloys; Transition element alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.12.165

•Fe74.5-xSi9B13.5CuxNb3 (x = 1 and 2.5 at. %) glass-coated microwires were prepared.•The as-quenched microwires present a nanocrystalline structure.•The structure of the as-quenched microwires is not homogeneous.•Nanocrystals are larger in the middle of the core and smaller at the surface.•This structure was obtained by modifying the Cu content and the cooling conditions. As-cast nanocrystalline Fe74.5−xSi9B13.5CuxNb3 (x=1 and 2.5at.%) glass-coated microwires have been prepared by drawing from the melt in a single step process. The cooling conditions and Cu content were modified in order to facilitate the growth of α-(Fe,Si) nanograins directly from the wire formation process. By increasing the cooling distance, the microstructure evolves from a fully amorphous one at low cooling distances to a nanocrystalline central area and an amorphous shell towards the surface at higher cooling distances. Changes of the composition and cooling conditions allow an extensive tailoring of the magnetic properties and structure of the as-cast glass-coated microwires.