Soft magnetic properties of nanocrystalline bcc Fe-Zr-B and Fe-M-B-Cu (M=transition metal) alloys with high saturation magnetization (invited)

Journal Article · Fri Nov 15 00:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.350006· OSTI ID:5061292

Suzuki, K; Makino, A; Inoue, A; Masumoto, T ^[1]

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1. Institute for Materials Research, Tohoku University, Sendai 980 (Japan)

A mostly single bcc phase with nanoscale grain sizes of 10 to 20 nm was found to form by annealing amorphous Fe-Zr-B, Fe-Hf-B, and Fe-M-B-Cu(M=Ti, Zr, Hf, Nb, and Ta) alloys for 3.6 ks in the range of 723 to 923 K. The high permeability ({mu}{sub {ital e}}) above 10 000 at 1 kHz combined with high saturation magnetization ({ital B}{sub {ital s}}) above 1.5 T was obtained for the bcc alloys. The highest {mu}{sub {ital e}} and {ital B}{sub {ital s}} values reach 14 000 and 1.7 T for Fe{sub 91}Zr{sub 7}B{sub 2}, 20 000 and 1.55 T for Fe{sub 87}Zr{sub 7}B{sub 5}Cu{sub 1}, and 48 000 and 1.52 T for Fe{sub 86}Zr{sub 7}B{sub 6}Cu{sub 1}. Magnetostriction ({lambda}{sub {ital s}}) decreases significantly by the phase transition from amorphous to bcc phase and is measured to be 1 {times} 10{sup {minus}6} for the bcc Fe{sub 86}Zr{sub 7}B{sub 6}Cu{sub 1} alloy. The small {lambda}{sub {ital s}} as well as the small grain size is concluded to be the reason for the good soft magnetic properties. The lattice parameter of this bcc phase is 0.2870 nm being larger than that of pure {alpha}-Fe. The small {lambda}{sub {ital s}} seems to be achieved by the dissolution of solute elements above an equilibrium solubility limit. The bcc Fe{sub 86}Zr{sub 7}B{sub 6}Cu{sub 1} alloy also shows the low core loss of 0.066 W/kg at 1 T and 50 Hz, which is considerably smaller than that of amorphous Fe{sub 78}Si{sub 9}B{sub 13} and bcc Fe-3.5mass%Si alloys in practical uses as core materials in transformer.

• OSTI ID: 5061292
• Journal Information: Journal of Applied Physics; (United States), Vol. 70:10; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
MAGNETIC PROPERTIES
COPPER ALLOYS
IRON ALLOYS
ZIRCONIUM ALLOYS
ANNEALING
BCC LATTICES
HIGH TEMPERATURE
MAGNETIZATION
MAGNETOSTRICTION
POLYCRYSTALS
TRANSITION ELEMENT ALLOYS
ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
HEAT TREATMENTS
PHYSICAL PROPERTIES
360104* - Metals & Alloys- Physical Properties