Syntheses and Fundamental Properties of Fe-rich Metastable Phase Alloys with Saturation Magnetization Exceeding 1.9 T

Abstract

A melt-spun Fe 90 Si 5 B 5 alloy ribbon consists of bcc-Fe(Si) + Fe 3 B + 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.

Syntheses and Fundamental Properties of Cr/Mo-Adoped Fe-Rich Alloys With Metastable Phase and Saturation Magnetization Near 1.9 T

“…The major phase in these alloys is identified as bcc-Fe from the ordinary XRD patterns. Besides, one can notice tiny peaks around 44 degree in the diffraction patterns of all alloys, which can be indexed as Fe 3 B phase 6 . This resulted structure is similar to that of the Fe 90 Si 5 B 5 alloy.…”

“…Meanwhile, a series of Fe-rich crystalline-based Fe 90 Si 10-x B x (x=2.5~7.5) alloys were developed as well 6 . These alloy ribbons consist mainly of bcc phase plus a minor mount of metastable phase such as amorphous and Fe 3 B phase.…”