Magnetic properties of nanocrystalline Fe82.65Cu1.35SixB16−x alloys (x=–7)

Abstract

The Si content dependences of the magnetic properties of the Fe82.65Cu1.35SixB16−x alloys prepared by melt spinning were studied. The maximum Bs and minimum Hc were observed at around x=2 for the annealed Fe82.65Cu1.35SixB16−x alloys. The Bs and Hc of the annealed Fe82.65Cu1.35Si2B14 alloy were 1.84T and 6.5A∕m, respectively. The average grain size of the bcc Fe nanocrystal in the annealed alloys with x⩽2 was about 20nm, it increased with x at x>2. The annealing temperature range without the precipitation of o-Fe3B expanded with Si content.

FeSiBPCu Nanocrystalline Soft Magnetic Alloys with High <I>B</I><SUB>s</SUB> of 1.9 Tesla Produced by Crystallizing Hetero-Amorphous Phase

“…The alloy shows the extremely high B s of 1.88 T due to the high Fe content and almost not-containing any metal elements except for Fe. The B s is higher than those of the amorphous and the previously reported nanocrystalline alloys, [1][2][3]13,15) and slightly lower than the Fe-3.5 mass%Si crystalline soft magnetic alloys. 16) ''A'' alloy also exhibits the low H c of 7 Am À1 and the high e of 25,000 due to the simultaneous realization of the homogeneous nanocrystalline structure and the much smaller magnetostriction () of þ2 Â 10 À6 than that of þ27 Â 10 À6 of Fe 78 Si 9 B 13 amorphous alloy.…”

“…We developed new Fe 83:3{84:3 Si 4 B 8 P 3{4 Cu 0:7 (at%) nanocrystalline soft magnetic alloys with much higher B s of around 1.9 T than those of the representative amorphous, the ordinary [1][2][3]5,8) and the recently reported 14,15) nanocrystalline alloys, almost comparable to Fe-3.5 mass%Si crystalline alloys 16) now in practical use.…”

The influence of P on glass forming ability and clusters in melt of FeSiBP amorphous soft-magnetic alloy

“…The addition of P in the FeSiB alloy system increases the clusters, and if there is no dominant cluster or multi-species clusters coexist, the alloy system will have a stable melt and enhanced GFAs. Table 1 summarizes the thermal stability as well as the magnetic properties of the Fe 79 Si 5 B 13 P 3 , Fe 82 Si 4 B 13 P 1 , amorphous, nanocrystalline, and crystalline alloys previously developed [18,[29][30][31][32]. Here, DT x (=T x -T g ) is adopted as the parameter, and the larger the parameter, the higher is the thermal stability.…”

Effect of Cu additions on the magnetic properties and microstructure of FeCoNbB nanocrystalline alloy

“…Subsequently, several new nanocrystalline soft magnetic alloys have been developed for different applications. One typical alloy system is FeBSiCu system including FeCuSiB [8] and FeSiBPCu [9] nanocrystalline soft magnetic alloys with saturation magnetic flux density (B s ) as high as 1.9 T, which is comparable with that of Si steels, but exhibiting much better soft magnetic properties than those of the Si steels. The other one is FeCoNiZrBCu nanocrystalline soft magnetic alloy system developed for high-temperature applications [10].…”