Patent ID: 7056394

Claim:
A Cu—Be based amorphous alloy product consisting of an alloy comprising an amorphous phase of 90% or more by volume fraction, said alloy consisting of a composition represented by the following formula: Cu 100-a-b Be a (Zr 1-x-y Hf x Ti y ) b , wherein a and b represent atomic percentages which are 3≦a≦5, 20≦b≦40, and x and y represent atomic fractions which are 0≦x+y≦1 and 0≦y≦0.25, wherein said amorphous alloy having a supercooled liquid temperature range ΔTx of 25 K or more, said supercooled liquid temperature range ΔTx being represented by the formula: ΔTx=Tx−Tg, wherein Tx represents a crystallization initiation temperature of said alloy, and Tg represents a glass transition temperature of said alloy, wherein said amorphous alloy having a reduced glass transition temperature of 0.58 or higher, said reduced glass transition temperature being represented by the following formula: Tg/Tm, wherein Tg represents a glass transition temperature of said alloy, and Tm represents a melting temperature of said alloy, and wherein said amorphous alloy product having a shape with a diameter or thickness of 1 mm or more, made through a copper-mold casting method, and exhibits a compressive fracture strength σ f of 2200 MPa.