High intensity high tenacious Zr based amorphous alloy

摘要

PROBLEM TO BE SOLVED: To provide an amorphous Zr alloy of practical use, combining high strength with high toughness. ;SOLUTION: This amorphous Zr alloy has a composition represented by formula Zr-Ala-Nib-Cuc-Md [wherein M is one or ≥2 elements selected from the group consisting of Ti, Nb, and Pd; (a), (b), (c), and (d) show atomic percentages and satisfy 5≤a≤10, 30≤b+c≤50, b/c≤1/3, and 0d≤7, respectively; and the balance consists of Zr with inevitable impurities] and contains an amorphous phase in an amount of ≥90% by volume fraction. The amorphous alloy shows ≥100°C supercooled liquid zone and has excellent amorphous phase forming ability. Further, the alloy is ≥1 mm thick and has mechanical properties of ≥1800 MPa tensile strength, ≥2500 MPa deflective strength, ≥100 kJ/m2 Charpy impact value, and ≥50 MPa.m1/2 fracture toughness value.;COPYRIGHT: (C)2000,JPO