Tough iron-based bulk metallic glass alloys

Patent metadata

Field	Value
Publication number	US-9359664-B2
Application number	US-201314023183-A
Country	US
Kind code	B2
Filing date	Sep 10, 2013
Priority date	May 19, 2009
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

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.

First claim

What is claimed is:

1. 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.

2. The metallic glass of claim 1 , wherein the atomic percent of P is from 10 to 13.

3. The metallic glass of claim 1 , wherein the atomic percent of C is from 4.5 to 5.5.

4. The metallic glass of claim 1 , wherein the atomic percent of B is from 2 to 3.

5. The metallic glass of claim 1 , wherein the combined atomic percent of P, C, and B is from 19 to 21.

6. The metallic glass of claim 1 , wherein the composition further comprises Si in an atomic percent of from 0.5 to 2.5.

7. The metallic glass of claim 6 , wherein the atomic percent of Si is from 1 to 2.

8. The metallic glass of claim 7 , wherein the combined atomic percent of P, C, B, and Si is from 19 to 21.

9. The metallic glass of claim 1 , wherein the atomic percent of Mo is from 4 to 6.

10. The metallic glass of claim 1 , wherein the composition further comprises Ni in an atomic percent of from 3 to 7.

11. The metallic glass of claim 10 , wherein the atomic percent of Ni is from 4 to 6.

12. The metallic glass of claim 1 , wherein the composition further comprises Cr in an atomic percent of from 1 to 7.

13. The metallic glass of claim 12 , wherein the composition further comprises Cr in an atomic percent of from 1 to 3.

14. The metallic glass of claim 1 , wherein the composition further comprises at least one of Co, Ru, Ga, Al, and Sb in an atomic percent of from 1 to 5.

15. The metallic glass of claim 1 , further comprising at least one trace element wherein the total weight fraction of said at least one trace element is less than 0.02.

16. The metallic glass alloy of claim 1 , wherein the composition is selected from the group consisting of Fe 74.5 Mo 5.5 P 12.5 C 5 B 2.5 , Fe 74.5 Mo 5.5 P 11 C 5 B 2.5 Si 1.5 , Fe 70 Mo 5 Ni 5 P 12.5 C 5 B 2.5 , Fe 70 Mo 5 Ni 5 P 11 C 5 B 2.5 Si 1.5 , Fe 68 Mo 5 Ni 5 Cr 2 P 12.5 C 5 B 2.5 , and Fe 68 Mo 5 Ni 5 Cr 2 P 11 C 5 B 2.5 Si 1.5 , where numbers denote atomic percent.

17. 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.

18. 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.

19. The object of claim 18 , wherein the object is a structural component for a consumer electronics product.

20. The object of claim 19 , wherein the structural component is selected from the group consisting of a casing, frame, housing and hinge.

21. The object of claim 18 , wherein the object is a structural component for biomedical applications.

22. The object of claim 21 , wherein the structural component is selected from the group consisting of a biomedical implant, a fixation device and an instrument.

23. The object of claim 18 , wherein the object is a jewelry item.

24. The object of claim 23 , wherein the jewelry item is selected from the group consisting of a watch, ring, necklace, earring, bracelet, cufflink, and a casing or packaging for such items.

25. The object of claim 18 , wherein the object is a soft magnetic article for power transformer applications.

26. The object of claim 25 , wherein the soft magnetic article is selected from the group consisting of a transformer core, switch, choke and inverter.

Assignees

• California Inst Of Techn

Inventors

• Demetriou Marios D
• Johnson William L

Classifications

• C22C45/008 Primary

  with Fe, Co or Ni as the major constituent (C22C45/02, C22C45/04 take precedence) · CPC title

• C22C33/003

  making amorphous alloys · CPC title

• C22C45/02 Primary

  with iron as the major constituent · CPC title

• Y10T24/3632

  Link · CPC title