AMORPHOUS ALLOY HAVING EXCELLENT BENDING STRENGTH AND IMPACT STRENGTH, AND METHOD FOR PRODUCING THE SAME

摘要

A molten alloy capable of forming an amorphous alloy is subjected to solidification under a pressure of more than 1 atm. to form an alloy having no defect, and also the cooling rate during the solidification is controlled so as to disperse fine crystals having a mean crystal grain diameter of 1 nm to 50 mu m in a crystal volume percentage of 5 to 40 %, to thereby impart a uniform residual compression stress over the whole resultant amorphous alloy ingot. Further, an amorphous alloy ingot produced by this method can be strengthened by heating the alloy ingot at a specific temperature rising rate and rendering, in a supercooled liquid state before crystallization, at least one of boron, carbon, oxygen, nitrogen and fluorine to penetrate from its surface, to thereby precipitate a high melting point compound thereof with an element forming the amorphous alloy within the alloy ingot.