Sintered nanocrystalline alloys

Patent metadata

Field	Value
Publication number	US-10407757-B2
Application number	US-201414214282-A
Country	US
Kind code	B2
Filing date	Mar 14, 2014
Priority date	Mar 14, 2013
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

Provided in one embodiment is a method, comprising: sintering a plurality of nanocrystalline particulates to form a nanocrystalline alloy, wherein at least some of the nanocrystalline particulates may include a non-equilibrium phase comprising a first metal material and a second metal material, and the first metal material may be soluble in the second metal material. The sintered nanocrystalline alloy may comprise a bulk nanocrystalline alloy.

First claim

What is claimed:

1. A sintered nanocrystalline alloy comprising W and Cr, wherein the W is present in an amount of at least about 60 at %, the Cr is present in an amount greater than or equal to 0.3 at %, the nanocrystalline alloy has a relative density of at least about 90%, and the nanocrystalline alloy comprises grains having a largest dimension smaller than about 1000 nm.

2. The alloy of claim 1 , wherein the nanocrystalline alloy comprises the W and the Cr in a solid solution.

3. The alloy of claim 2 , wherein the nanocrystalline alloy further comprises Ti.

4. The alloy of claim 1 , wherein the nanocrystalline alloy is substantially thermodynamically stable at a temperature that is greater than or equal to about 1,000° C.

5. The alloy of claim 1 , wherein the nanocrystalline alloy has a relative density of at least about 98%.

6. The alloy of claim 1 , wherein the nanocrystalline alloy further comprises at least one of Pd, Pt, Ni, Co, Fe, Ti, V, and Sc.

7. The alloy of claim 1 , wherein the nanocrystalline alloy has an average grain size of less than about 100 nm.

8. The alloy of claim 1 , wherein the Cr is present in an amount greater than or equal to 1 at %.

9. The alloy of claim 1 , wherein the Cr is present in an amount greater than or equal to 5 at %.

10. The alloy of claim 2 , wherein the Cr is present in an amount greater than or equal to 10 at %.

11. The alloy of claim 1 , wherein the Cr is present in an amount greater than or equal to 15 at %.

12. The alloy of claim 1 , wherein the Cr is present in an amount of 0.3 at % to 40 at %.

13. The alloy of claim 1 , wherein the Cr is present in an amount of 1 at % to 30 at %.

14. The alloy of claim 1 , wherein the W is present in an amount of at least about 70 at %.

15. The alloy of claim 1 , wherein the W is present in an amount of at least about 60 at % and less than or equal to about 95 at %.

16. The alloy of claim 1 , wherein the W is present in an amount of at least about 70 at % and less than or equal to about 95 at %.

17. A bulk nanocrystalline alloy, comprising:
a first metal material that includes W; and
a second metal material that includes Cr,
wherein the bulk nanocrystalline alloy has an average grain size of less than about 100 nm, the W is present in an amount of at least about 60 at %, and the Cr is present in an amount greater than or equal to 0.3 at %.

18. The bulk nanocrystalline alloy of claim 17 , wherein the bulk nanocrystalline alloy has a relative density of at least about 90%.

19. The bulk nanocrystalline alloy of claim 18 , wherein the bulk nanocrystalline alloy has a relative density of at least about 95%.

20. The bulk nanocrystalline alloy of claim 19 , wherein the bulk nanocrystalline alloy has a relative density of at least about 98%.

21. The bulk nanocrystalline alloy of claim 17 , wherein the bulk nanocrystalline alloy is substantially thermodynamically stable at a temperature of about 1,000° C.

22. The bulk nanocrystalline alloy of claim 17 , wherein the W and the Cr are in a solid solution.

23. The bulk nanocrystalline alloy of claim 17 , wherein the Cr is present in an amount greater than or equal to 1 at %.

24. The bulk nanocrystalline alloy of claim 17 , wherein the Cr is present in an amount greater than or equal to 5 at %.

25. The bulk nanocrystalline alloy of claim 17 , wherein the Cr is present in an amount greater than or equal to 10 at %.

26. The bulk nanocrystalline alloy of claim 17 , wherein the Cr is present in an amount greater than or equal to 15 at %.

27. The bulk nanocrystalline alloy of claim 17 , wherein the Cr is present in an amount of 0.3 at % to 40 at %.

28. The bulk nanocrystalline alloy of claim 17 , wherein the Cr is present in an amount of 1 at % to 30 at %.

29. The bulk nanocrystalline alloy of claim 17 , wherein the W is present in an amount of at least about 70 at %.

30. The bulk nanocrystalline alloy of claim 17 , wherein the W is present in an amount of at least about 60 at % and less than or equal to about 95 at %.

31. The bulk nanocrystalline alloy of claim 17 , wherein the W is present in an amount of at least about 70 at % and less than or equal to about 95 at %.

Assignees

• Massachusetts Inst Technology

Inventors

• Schuh Christopher A
• Park Mansoo

Classifications

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• C22C27/06

  Alloys based on chromium · CPC title

• C22C27/04 Primary

  Alloys based on tungsten or molybdenum · CPC title

• B22F3/10 Primary

  Sintering only · CPC title

• C22C2200/04

  Nanocrystalline · CPC title