Structure and Magnetic Properties of As-Quenched Fe87−xZr3.5Nb3.5B6Cux Ribbons

The influences of Cu addition upon structure and magnetic properties of as-quenched Fe 87-x Zr 3.5 Nb 3.5 B 6 Cu x ribbons are investigated. An appropriate content of Cu addition improves the nucleation of α-Fe through increasing the number-density of nucleation sites in as-quenched Fe 87-x Zr 3.5 Nb 3.5 B 6 Cu x , ribbons. However, at high Cu dopants (x ≥ 3.5) the nucleation effect of α-Fe becomes weak, possibly connected with the reduction of effective number-density of Cu clusters due to the coarsening effect of them. Among as-quenched Fe 87-x Zr 3.5 Nb 3.5 B 6 Cu x ribbons prepared with a wheel speed of 35 m/s, the as-quenched Fe 84 Zr 3.5 Nb 3.5 B 6 Cu x (x = 3) ribbon with the largest permeability (2.4 × 10 4 at 1 kHz) and saturation magnetic induction (1.18 T), possibly has the highest number-density of Cu clusters which can serve as nucleation sites for α-Fe grains.

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