Cu-base amorphous alloy

Details Cu-base amorphous alloy Cu-base amorphous alloy

2008-07-15

2008-07-15

Wyszomierski, George (Department: 1793)

Metal treatment

Stock

Amorphous, i.e., glassy

C420S489000, C420S492000

Reexamination Certificate

active

10525738

ABSTRACT:
To provide a Cu-based amorphous alloy having a glass-forming ability higher than that of a Cu—Zr—Ti amorphous alloy and a Cu—Hf—Ti amorphous alloy, as well as excellent workability and excellent mechanical properties without containing large amounts of Ti.A Cu-based amorphous alloy characterized by containing 90 percent by volume or more of amorphous phase having a composition represented by Formula: Cu100-a-b(Zr,Hf)a(Al,Ga)b[in Formula, a and b are on an atomic percent basis and satisfy 35 atomic percent≦a≦50 atomic percent and 2 atomic percent≦b≦10 atomic percent], wherein the temperature interval ΔTx of supercooled liquid region is 45 K or more, the temperature interval being represented by Formula ΔTx=Tx−Tg (where Tx represents a crystallization initiation temperature and Tg represents a glass transition temperature.), a rod or a sheet having a diameter or thickness of 1 mm or more and a volume fraction of amorphous phase of 90% or more can be produced by a metal mold casting method, the compressive strength is 1,900 MPa or more, the Young's modulus is 100 GPa or more, and the Vickers hardness is 500 Hv or more.

REFERENCES:
patent: 5980652 (1999-11-01), Inoue et al.
patent: 7056394 (2006-06-01), Inoue et al.
patent: 9-20968 (1997-01-01), None
patent: 11-61289 (1999-03-01), None
patent: WO 00/26425 (2000-05-01), None
patent: WO 02/053791 (2002-07-01), None

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