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An alloy is described that is capable of forming a metallic glass at moderate cooling rates and exhibits large plastic flow at ambient temperature. Preferably, the alloy has a composition of (Zr, Hf)aTabTicCudNieAlf,where the composition ranges (in atomic percent) are 45≤a≤70, 3≤b≤7.5, 0≤c≤4, 3≤b+c≤

An alloy is described that is capable of forming a metallic glass at moderate cooling rates and exhibits large plastic flow at ambient temperature. Preferably, the alloy has a composition of (Zr, Hf)aTabTicCudNieAlf,where the composition ranges (in atomic percent) are 45≤a≤70, 3≤b≤7.5, 0≤c≤4, 3≤b+c≤10, 10≤d≤30, 0≤e≤20, 10≤d+e≤35, and 5≤f≤15. The alloy may be cast into a bulk solid with disordered atomic-scale structure, i.e., a metallic glass, by a variety of techniques including copper mold die casting and planar flow casting. The as-cast amorphous solid has good ductility while retaining all of the characteristic features of known metallic glasses, including a distinct glass transition, a supercooled liquid region, and an absence of long-range atomic order. The alloy may be used to form a composite structure including quasi-crystals embedded in an amorphous matrix. Such a composite quasi-crystalline structure has much higher mechanical strength than a crystalline structure.

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1. A method of forming a metallic glass exhibiting a plastic strain to failure in compression of more than about 1.5 percent at ambient temperature, the method comprising: providing an alloy having a composition of ZraTabTicCudNieAlf,wherein the composition ranges in atomic percent are 45≤a≤70, 2

1. A method of forming a metallic glass exhibiting a plastic strain to failure in compression of more than about 1.5 percent at ambient temperature, the method comprising: providing an alloy having a composition of ZraTabTicCudNieAlf,wherein the composition ranges in atomic percent are 45≤a≤70, 2≤b≤7, 2≤c≤7, 4≤b+c≤25, 10≤d≤25, 5≤e≤15, and 5≤f≤15; casting the alloy into an amorphous solid; annealing the solid; and cooling the solid at a rate of between about 1 K/s and about 1000 K/s. 2. The method of claim 1, wherein said casting comprises copper mold casting. 3. The method of claim 1, wherein said casting comprises planar flow casting. 4. The method of claim 1, wherein said casting comprises injection die casting. 5. The method of claim 1, wherein said casting comprises suction casting. 6. The method of claim 1, wherein said casting comprises arc melting. 7. A method of forming a metallic glass exhibiting a plastic strain to failure in compression of more than about 1.5 percent at ambient temperature, the method comprising: providing an alloy having a composition of ZraTabTicCudNieAlf,wherein the composition ranges in atomic percent are 45≤a≤70, 2≤b≤7, 2≤c≤7, 4≤b+c≤25, 10≤d≤25, 5≤e≤15, and 5≤f≤15; and casting the alloy into an amorphous solid. 8. The method of claim 7, further comprising the steps of: annealing the solid; and cooling the solid at a rate of between about 1 K/s and about 1000 K/s. 9. The method of claim 7, wherein said casting comprises copper mold casting. 10. The method of claim 7, wherein said casting comprises planar flow casting. 11. The method of claim 7, wherein said casting comprises injection die casting. 12. The method of claim 7, wherein said casting comprises suction casting. 13. The method of claim 7, wherein said casting comprises arc melting.