| 摘要 |
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: Cu<SUB>100-a-b</SUB>(Zr,Hf)<SUB>a</SUB>(Al,Ga)<SUB>b </SUB>[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 DeltaTx of supercooled liquid region is 45 K or more, the temperature interval being represented by Formula DeltaTx=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.
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