Patent ID: 8470103

Claim:
A method of making a Cu-base bulk amorphous alloy product comprising: preparing an alloy melt consisting essentially of a composition represented by the following formula: Cu 100-a-b (Zr+Hf) a Ti b , wherein a and b are atomic percentages falling within the following ranges: 30<a≦35, 10≦b≦15, 40≦a+b≦45, casting said alloy melt into a copper mold at an injection pressure of 0.5 to 1.5 kg·f/cm 2 and solidifying in the mold, thereby obtaining a rod or plate product having a diameter or thickness of 1 mm to 4 mm, wherein said rod or plate product has an amorphous phase of 90% or more by volume fraction, and wherein said rod or plate product has a compressive fracture strength of 1800 MPa or more, an elongation of 1.5% or more, and a Young's modulus of 100 GPa or more, wherein a supercooled liquid region of said amorphous phase has a temperature interval ΔTx of 25 K or more, said temperature interval being presented by the following formula: ΔTx=Tx−Tg, Tx being a crystallization temperature of said alloy, and Tg being a glass transition temperature of said alloy, wherein said alloy melt has a reduced glass transition temperature of 0.56 or more, said reduced-glass transition temperature being represented by the following formula: Tg/Tm, wherein Tg is a glass transition temperature of said alloy, and Tm is a melting temperature of said alloy.