Nanocrystalline Fe-M-B-Cu (M=Zr, Nb) alloys with improved soft magnetic properties (abstract)

Journal Article · Mon Apr 01 00:00:00 EST 1996 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.362277· OSTI ID:280058

Makino, A; Bitoh, T ^[1]; Inoue, A; Masumoto, T ^[2]

---

1. Central Research Laboratory, Alps Electric Co. Ltd, Nagaoka 940 (Japan)
2. Institute for Materials Research, Tohoku University, Sendai 980 (Japan)

We have recently succeeded in producing good soft magnetic properties and high saturation magnetic density ({ital B}{sub {ital s}}) for nanocrystalline Fe-M-B (M=Zr, Hf, or Nb) ternary alloys prepared by melt spun and sputtered technic. The alloys have the mixed structure consisting of {alpha}-Fe particles with 10{endash}20 nm in size embedded in a remaining amorphous phase. The nanocrystalline bcc Fe{sub 90}Zr{sub 7}B{sub 3}, Fe{sub 89}Hf{sub 7}B{sub 4} and Fe{sub 84}Nb{sub 7}B{sub 9} alloy ribbons subjected to the optimum annealing exhibit high {ital B}{sub {ital s}} of 1.5{endash}1.7 T as well as high effective permeability ({mu}{sub {ital e}}) of 22000{endash}32000 at 1 kHz. The soft magnetic properties of the nanocrystalline Fe-M-B alloys were found to be improved by adding small amounts of Cu and by optimizing the chemical composition. The addition of Cu to the alloys decreases the bcc grain size. The excellent soft magnetic properties (high {mu}{sub {ital e}} of 100000 at 1 kHz combined with high {ital B}{sub {ital s}} of 1.53 T) can be achieved in the region where small grain size as well as nearly zero magnetostriction are obtained, which is attained in the compositional range around Fe{sub 84}Nb{sub 3.5}Zr{sub 3.5}B{sub 8}Cu{sub 1}. The soft magnetic properties can be further improved by preannealing before crystallization treatment, probably resulting from the decrease in the distribution of the grain size at the crystallized state. Consequently, the {mu}{sub {ital e}} reaches the maximum value of 120000 for the nanocrystalline Fe{sub 84}Nb{sub 3.5}Zr{sub 3.5}B{sub 8}Cu{sub 1} alloy. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 280058
• Report Number(s): CONF-951101-; ISSN 0021-8979; TRN: 9608M0114
• Journal Information: Journal of Applied Physics, Vol. 79, Issue 8; Conference: 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995; Other Information: PBD: Apr 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON ALLOYS
MAGNETIC PROPERTIES
BORON ALLOYS
COPPER ALLOYS
ZIRCONIUM ALLOYS
NIOBIUM ALLOYS
MAGNETIC MATERIALS
MICROSTRUCTURE
ANNEALING