Tough iron-based bulk metallic glass alloys
AssigneeCalifornia Institute of Technology
InventorsMarios D. Demetriou, William L. Johnson
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Abstract
A family of iron-based, phosphor-containing bulk metallic glasses having excellent processibility and toughness, methods for forming such alloys, and processes for manufacturing articles therefrom are provided. The inventive iron-based alloy is based on the observation that by very tightly controlling the composition of the metalloid moiety of the Fe-based, P-containing bulk metallic glass alloys it is possible to obtain highly processable alloys with surprisingly low shear modulus and high toughness.
Claims26
An Fe-based metallic glass composition comprising at least Fe, Mo, P, C and B, where Fe comprises an atomic percent of at least 60, Mo comprises an atomic percent of from 2 to 8, P comprises an atomic percent of from 5 to 17.5, C comprises an atomic percent of from 3 to 6.5, and B comprises an atomic percent of from 1 to 3.5, wherein the alloy has a shear modulus (G) of less than 60 GPa, and the composition is capable of forming a bulk object having a critical thickness of at least 2 mm.
A method of manufacturing a metallic glass composition comprising:
- providing a feedstock material comprising at least Fe, Mo, P, C and B, where Fe comprises an atomic percent of at least 60, Mo comprises an atomic percent of from 2 to 8, P comprises an atomic percent of from 5 to 17.5, C comprises an atomic percent of from 3 to 6.5, and B comprises an atomic percent of from 1 to 3.5, wherein the alloy has a shear modulus (G) of less than 60 GPa, and the composition is capable of forming a bulk object having a critical thickness of at least 2 mm;
- and
- melting said feedstock into a molten state;
- and
- quenching said molten feedstock at a cooling rate sufficiently rapid to prevent crystallization of said alloy.
A metallic glass object comprising:
- a body formed of a metallic glass alloy comprising at least Fe, Mo, P, C and B, where Fe comprises an atomic percent of at least 60, Mo comprises an atomic percent of from 2 to 8, P comprises an atomic percent of from 5 to 17.5, C comprises an atomic percent of from 3 to 6.5, and B comprises an atomic percent of from 1 to 3.5, wherein the alloy has a shear modulus (G) of less than 60 GPa, and the composition is capable of forming a bulk object having a critical thickness of at least 2 mm.
Dependencies are inferred from the claim text.