Abstract
A melt-spun Fe90Si5B5 alloy ribbon consists of bcc-Fe(Si) + Fe3B + amorphous phase and exhibits good bending ductility, high tensile fracture strength above 1000 MPa, high corrosion resistance and unique magnetic properties as exemplified for high saturation magnetization exceeding 1.9 T, moderately high initial permeability of about 150 and low coercivity of 745 A/m which are attractive for magnetic sensors utilizing a nearly constant high permeability with applied field up to coercivity. Besides, the tensile fracture strength and elongation increase significantly to 1286 MPa and 0.62%, respectively, after annealing for 900 s at 823 K. The Fe-Si-B alloy ribbons are attractive as a new type of sensor material with features of high bending ductility, high tensile strength and elongation, relatively good corrosion resistanceand unique soft magnetic properties with very high saturation magnetization.
Highlights
It is known that Fe-based amorphous and glassy alloys prepared by melt spinning exhibit good soft magnetic properties with relatively high saturation magnetization and have been used as soft magnetic materials such as transformer cores, inductors, magnetic field sensors and etc1-5
The XRD patterns consist of only a bcc-Fe(Si,B) phase on the roll-contacted surface and a mixed phase of bcc-Fe(Si) and Fe3B phases on the freely solidified surface, indicating that the cooling rate is lower for the freely solidified surface
The results obtained are summarized: [1] The as-spun structure consists of bcc-Fe(Si) + Fe3B + amorphous phases for Fe90Si5B5 and Fe90Si2.5B7.5 alloys and bcc-Fe + amorphous for Fe90Si7.5B2.5, Fe91Si4.5B4.5 and Fe92Si4B4 alloys
Summary
It is known that Fe-based amorphous and glassy alloys prepared by melt spinning exhibit good soft magnetic properties with relatively high saturation magnetization and have been used as soft magnetic materials such as transformer cores, inductors, magnetic field sensors and etc. Fe-based amorphous and glassy alloys have already gained real application fields, further efforts have been devoted to improve fundamental properties such as glass-forming ability, amorphous or glass formation ranges, mechanical strength, corrosion resistance and magnetic properties for Fe-based amorphous and glassy alloys even nowadays. The saturation magnetization for amorphous alloys increases steadily from 1.53 T for conventional amorphous alloys to 1.63 T for a new type of amorphous alloy. The new Fe-based alloys are located in a maximum Fe-rich concentration range and the further increase in Fe content causes significant decrease in soft magnetic properties as well as the loss of good bending ductility for the melt-spun ribbons. The brittle nature reduces significantly the engineering value as soft magnetic materials
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