| 摘要 |
A process of producing a high toughness iron-based amorphous alloy strip, using a single roll liquid quenching method, the strip having a thickness of more than 55 mum up to 100 mum and a width of 20 mm or more and having a fracture strain epsilonf satisfying the relationship epsilonf>0.1 where epsilonf=t/(D-t), t=thickness of the strip, and D=bent diameter upon fracture, epsilonf being determined by bending the strip with a free cooling surface thereof facing outward, the process comprising the steps of: ejecting a molten metal alloy through a nozzle; applying the ejected molten metal alloy to a surface of a rotating roll; allowing the applied molten metal alloy to be quenched by the roll surface to form an amorphous strip of the metal alloy, the strip being quenched at a cooling rate, determined at a free surface thereof, of 10<3>° C./sec or more in a temperature range of from 500° C. to 200° C.; and continuously coiling the quenched strip at a temperature of 200° C. or lower.
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