Magnetic and Thermal Properties of Fe73.5Si13.5B9Cu1Nb3 Amorphous Ribbon and Ball-Milled Powders

Abstract

This paper reports magnetic and thermal properties of Fe73.5Si13.5B9Cu1Nb3 amorphous ribbon and its powders prepared by ball milling. Differential thermal analysis of the amorphous ribbon showed its Curie temperature at 400 °C, and two crystalline peaks at 500 and 550 °C, respectively. X-ray diffraction analysis demonstrated that a secondary phase Fe2B appeared at 500 °C, causing a maximum strain of 0.195 % in the ribbon at 600 °C. The optimized soft magnetic properties of Fe73.5Si13.5B9Cu1Nb3 ribbon were found in the sample annealed at 450 °C, with saturation magnetization Bm = 1.84×104 G and coercivity Hc = 17.95 Oe. After ball milling, the Fe73.5Si13.5B9Cu1Nb3 powders reached a mean particle size of 10 μm, with partial crystallization during the ball milling process. The ball milling decreased Bm while increased Hc, due to anisotropy induced by stress.

The Influence of Annealing Temperature on Microstructure and Magnetic Properties of Fe 74 Co 3 Si 8 B 10 Al 1 Nb 4 Amorphous Alloy Ribbons

“…Therefore the final nanostructured composites consisted of ferromagnetic nanograins embedded in a ferromagnetic amorphous matrix. Furthermore, the heat treatment of the alloy ribbons must be performed in the final toroid shape, since it becomes extremely brittle in the composite with nanocrystalline structure (Borrego et al, 2014;Chen et al, 2014;Wang et al, 2013;Zuo et al, 2005).…”