| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1799402 | Journal of Magnetism and Magnetic Materials | 2015 | 5 Pages |
•Adding 10% Co into Si-rich Fe74.5Nb2Si17.5B5Cu1 alloy decreases TX10 and enlarges ΔTX.•Adding 10% Co into Si-rich Fe74.5Nb2Si17.5B5Cu1 alloy enhances both Tcam andTccry.•(Fe0.9Co0.1)74.5Nb2Si17.5B5Cu1 alloy exhibits good high temperature magnetic softness.
Structure and magnetic properties of as-quenched and annealed (Fe0.9Co0.1)74.5Nb2Si17.5B5Cu1 alloy were mainly investigated by x-ray diffraction and by measuring the temperature dependence of initial permeability (μi–T curves) from room temperature up to 700 °C. The as-quenched sample exhibits a lower onset primary crystallization temperature (TX10=475°C) and a larger crystallized interval temperature (ΔTX=TX20−TX10=201°C) for precipitating the single soft magnetic crystal phase. The Curie temperature of amorphous phaseTcam for as-quenched sample and the Curie temperature of crystalline phase Tccry for annealed sample were detected to be about 400 °C and 670 °C respectively, which are both higher than that of Fe74.5Nb2Si17.5B5Cu1 alloy. So promising high temperature soft magnetic properties are expected. Annealing temperature (Ta) exerts a significant effect on room- and high-temperature μi. When Ta is at 600 °C (optimum annealing condition), although, the room temperature permeability of nanocrystalline (Fe0.9Co0.1)74.5Nb2Si17.5B5Cu1 alloy was not as high as that of nanocrystalline Fe74.5Nb2Si17.5B5Cu1 alloy, an improved high temperature magnetic softness was observed. The values of μi for the 600 °C-annealed sample is larger than that of Fe74.5Nb2Si17.5B5Cu1 alloy when temperature increases from 520 °C to 670 °C. The origin for the evolution of initial permeability at elevated temperatures was also analyzed.
