Unitika Ltd.

Kouhachi Nomura

Michiaki Hagiwara

Akira Menju

Akio Nakamura

An iron-base amorphous alloy is described, having improved fatigue and toughness characteristics consisting essentially of from 6 to 16 atom % Si, from 7.5 to 16 atom % B, and from 2 to 9 atom % Cr, provided that the composition ranges of Si, B, and Cr are within the quadrangles defined by a-b-c-d of FIG. 1, and e.sub.1 -f.sub.1 -g.sub.1 -h.sub.1 of FIG. 2, and the balance being substantially Fe. In addition to improved fatigue and toughness characteristics, the amorphous alloy has excellent tensile break strength, heat resistance, corrosion resistance and electromagnetic properties, and is therefore very useful for industrial reinforcements and electromagnetic materials.

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Kyoto, Japan

Kouhachi Nomura