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US 2020/0263267 A1Published application
Tough Iron-Based Glasses with High Glass Forming Ability and High Thermal Stability
AssigneeGlassimetal Technology, Inc.
InventorsJong Hyun Na, Kyung-Hee Han, Marios D. Demetriou, William L. Johnson
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Abstract
The disclosure provides Fe—Cr—Ni—Mo—P—C—B metallic glass-forming alloys and metallic glasses that have a high glass forming ability along with a high thermal stability of the supercooled liquid against crystallization.
Claims20
A metallic glass-forming alloy having a composition represented by the following formula:
- Fe(100-a-b-c-d-e-f)CraNibMocPdCeBf
- where:
- a is up to 10 atomic percent,
- b ranges from 3 to 13 atomic percent,
- c ranges from 2 to 7 atomic percent,
- d+e+f ranges from 21.25 to 23.75 atomic percent,
- e ranges from 4.5 to 8;
- atomic percent, and
- f ranges from 1 to 9 atomic percent;
- and
- wherein the metallic glass-forming alloy has a critical rod diameter of at least 3 mm, and wherein the thermal stability of the supercooled liquid of a metallic glass formed from the metallic glass-forming alloy against crystallization is at least 45° C.
8 more elements
A method for forming a metallic glass comprising:
- providing a sample of a metallic glass-forming alloy having a composition represented by the following formula:
- Fe(100-a-b-c-d-e-f)CraNibMocPdCeBf
- where:
- a is up to 10 atomic percent,
- b ranges from 3 to 13 atomic percent,
- c ranges from 2 to 7 atomic percent,
- d+e+f ranges from 21.25 to 23.75 atomic percent,
- e ranges from 4.5 to 8;
- atomic percent, and
- f ranges from 1 to 9 atomic percent, and
- wherein the metallic glass-forming alloy has a critical rod diameter of at least 3 mm, and wherein the thermal stability of the supercooled liquid of a metallic glass formed from the metallic glass-forming alloy against crystallization is at least 45° C.;
- heating and melting the sample of the metallic glass-forming alloy under inert atmosphere to create a molten alloy;
- and
- quenching the molten alloy fast enough to avoid crystallization of the molten alloy.
11 more elements
A method of thermoplastically shaping a metallic glass into an article, comprising:
- providing a sample of a metallic glass having a composition represented by the following formula:
- Fe(100-a-b-c-d-e-f)CraNibMocPdCeBf
- where:
- a is up to 10 atomic percent,
- b ranges from 3 to 13 atomic percent,
- c ranges from 2 to 7 atomic percent,
- d+e+f ranges from 21.25 to 23.75 atomic percent,
- e ranges from 4.5 to 8;
- atomic percent, and
- f ranges from 1 to 9 atomic percent, and
- wherein the thermal stability of the supercooled liquid of the metallic glass against crystallization is at least 45° C.;
- heating the sample to a softening temperature To above the glass transition temperature Tg, of the metallic glass to create a heated sample;
- applying a deformational force to shape the heated sample over a time to that is shorter than the time it takes for the metallic glass to crystallize at To;
- and
- cooling the heated sample to a temperature below Tg to form an article.
12 more elements
Dependencies are inferred from the claim text.