The soft magnetic properties of Fe-Al-Nb-B alloy ribbons crystallized from an amorphous state were investigated. These alloy ribbons showed high magnetic flux density corresponding to that of Fe-based amorphous alloy ribbons after annealing. Fe
79Al
4Nb
5B
12 alloy ribbon showed particularly good soft magnetic properties (
Bs=1.46 T, λ
s=2.0 × 10
-6,
Pc=15 Wkg
-1 (
f= 100 kHz,
Bm=0.1 T)).
The ribbons were composed of bccFe crystallites in the disordered phase, with a grain diameter of less than 20 nm. It was presumed that most of the Al in the alloy was contained in the bccFe crystallite.
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