Zr-based amorphous alloy excellent in bending strength and impact strength and its production method

摘要

PROBLEM TO BE SOLVED: To provide an amorphous alloy excellent in bending strength and impact strength without deteriorating high strength characteristic owing to amorphous structure. ;SOLUTION: A molten alloy having an amorphous-substance-forming ability is subjected to pressure solidification under a pressure exceeding 1 atm to eliminate casting defects, and also fine crystals of 1 nm to 50 m average grain size and 5 to 40% crystal volume fraction are dispersed in the amorphous alloy ingot by regulating cooling velocity during solidification to uniformly apply residual compressive stress to the amorphous alloy ingot. Further, the strengthening of the alloy can be performed by subjecting the amorphous alloy ingot, produced by this method, to heating at a prescribed temperature-rise rate and allowing, in a state of supercooled liquid before crystallization, at least one or more elements among boron, carbon, oxygen, nitrogen, fluorine to penetrate through the surface to precipitate a high melting point compound with an amorphous-alloy-forming element in the inner part of the alloy.;COPYRIGHT: (C)2000,JPO