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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.

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This paper reports magnetic and thermal properties of Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 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 Fe 2 B appeared at 500 °C, causing a maximum strain of 0.195 % in the ribbon at 600 °C. The optimized soft magnetic properties of Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 ribbon were found in the sample annealed at 450 °C, with saturation magnetization B m = 1.84×104 G and coercivity H c = 17.95 Oe. After ball milling, the Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 powders reached a mean particle size of 10 μm, with partial crystallization during the ball milling process. The ball milling decreased B m while increased H c , due to anisotropy induced by stress.