PREPARATION OF AMORPHOUS FE-SI-B AND CO-SI-B ALLOY WIRES BY A MELT EXTRACTION METHOD AND THEIR MECHANICAL AND MAGNETIC-PROPERTIES

Citation
A. Inoue et al., PREPARATION OF AMORPHOUS FE-SI-B AND CO-SI-B ALLOY WIRES BY A MELT EXTRACTION METHOD AND THEIR MECHANICAL AND MAGNETIC-PROPERTIES, Materials transactions, JIM, 36(7), 1995, pp. 802-809
Citations number
21
Categorie Soggetti
Metallurgy & Metallurigical Engineering","Material Science
Journal title
ISSN journal
09161821
Volume
36
Issue
7
Year of publication
1995
Pages
802 - 809
Database
ISI
SICI code
0916-1821(1995)36:7<802:POAFAC>2.0.ZU;2-F
Abstract
Amorphous (Fe, Co)-Si-B ternary and quaternary wires were found to be produced over a wire diameter range of 20 to 80 mu m by a melt extract ion method using a copper wheel with an edge angle of 60 degrees. The wires without any concaves in the transverse cross section were prepar ed in the extraction condition where the circumferential velocity of t he wheel and the rising velocity of the molten alloy are in the range of 20 to 40 m/s and 0.1 to 4.0 mm/s, respectively. The resulting amorp hous wires have good bending ductility in the wire diameter range belo w 80 mu m for the Fe75Si10B15 alloy and below 60 mu m for the Co72.5Si 12.5B15 alloy. The thermal stability and mechanical properties except tensile fracture strength (sigma(f)) for theamorphous wires are nearly the same as those for the melt-spun amorphous ribbons. The sigma(f) i s 3800 MPa for the Fe75Si10B15 wire and 3600 MPa for the Co72.5Si12.5B 15 wire, being about 10% higher than those for the corresponding ribbo n samples because of the low degree of stress concentration resulting from the good smoothness on the outer surface. The magnetic properties of saturation magnetization, coercivity and effective permeability at 1 kHz for the wires are nearly the same as those for the ribbons. The squareness of the hysteresis B-H loop for the Fe-Si-B amorphous wire is better than that for the same Fe-based ribbon and the sharp output voltage due to the reversion of magnetic flux is also observed for the present Fe78Si10B12 amorphous wire. The combined properties of good m echanical properties and unique magnetic properties leading to the gen eration of the sharp output voltage seem to be promising for the subse quent development of the present fine amorphous wires.