Sintered nanocrystalline alloys

Patent metadata

Field	Value
Publication number	US-11634797-B2
Application number	US-201916537996-A
Country	US
Kind code	B2
Filing date	Aug 12, 2019
Priority date	Mar 14, 2013
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

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 is:

1. A sintered nanocrystalline alloy, comprising:
metallic tungsten (W) present in an amount of at least about 60 at %; and
at least one of the following elements present in an amount greater than or equal to 1 at %: Pd, Pt, and V;
wherein the nanocrystalline alloy has a relative density of at least about 90%, and the nanocrystalline alloy has a grain size of smaller than 1000 nm.

2. The sintered nanocrystalline 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 %.

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

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

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

6. The sintered nanocrystalline alloy of claim 1 , wherein the sintered nanocrystalline alloy comprises Pd in an amount greater than or equal to 1 at %.

7. The sintered nanocrystalline alloy of claim 1 , wherein the sintered nanocrystalline alloy comprises Pt in an amount greater than or equal to 1 at %.

8. The sintered nanocrystalline alloy of claim 1 , wherein the sintered nanocrystalline alloy comprises V in an amount greater than or equal to 1 at %.

9. The sintered nanocrystalline alloy of claim 1 , wherein the sintered nanocrystalline alloy further comprises Sc in an amount greater than or equal to 1 at %.

10. The sintered nanocrystalline alloy of claim 1 , wherein at least one of Pd, Pt, and V is present in an amount greater than or equal to 5 at %.

11. A bulk nanocrystalline alloy, comprising:
metallic tungsten (W) present in an amount of at least about 60 at %; and
at least one of the following elements present in an amount greater than or equal to 1 at %: Pd, Pt, and V;
wherein the bulk nanocrystalline alloy has a grain size of smaller than 1000 nm.

12. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy has a relative density of at least about 90%.

13. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy has a relative density of at least about 95%.

14. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy has a relative density of at least about 98%.

15. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy is substantially thermodynamically stable at a temperature that is greater than or equal to about 1,000° C.

16. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy has an average grain size of less than about 100 nm.

17. The bulk nanocrystalline alloy of claim 11 , wherein the W is present in an amount of at least about 60 at % and less than or equal to about 95 at %.

18. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy comprises Pd in an amount greater than or equal to 1 at %.

19. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy comprises Pt in an amount greater than or equal to 1 at %.

20. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy comprises V in an amount greater than or equal to 1 at %.

21. The bulk nanocrystalline alloy of claim 11 , wherein the bulk nanocrystalline alloy further comprises Sc in an amount greater than or equal to 1 at %.

22. The bulk nanocrystalline alloy of claim 11 , wherein at least one of Pd, Pt, and V is present in an amount greater than or equal to 5 at %.

23. A sintered nanocrystalline alloy, comprising:
metallic tungsten (W) present in an amount of at least about 60 at %; and
Sc present in an amount greater than or equal to 5 at %;
wherein the nanocrystalline alloy has a relative density of at least about 90%, and the nanocrystalline alloy has a grain size of smaller than 1000 nm.

24. A bulk nanocrystalline alloy, comprising:
metallic tungsten (W) present in an amount of at least about 60 at %; and
Sc present in an amount greater than or equal to 5 at %;
wherein the bulk nanocrystalline alloy has a grain size of smaller than 1000 nm.

Assignees

• Massachusetts Inst Technology

Inventors

• Schuh Christopher A
• Park Mansoo

Classifications

• C22C1/045

  Alloys based on refractory metals · CPC title

• B22F1/07

  Metallic powder characterised by particles having a nanoscale microstructure (nanosized particles B22F1/054) · CPC title

• C22C27/04 Primary

  Alloys based on tungsten or molybdenum · CPC title

• B22F3/10 Primary

  Sintering only · CPC title

• B22F3/1035

  Liquid phase sintering · CPC title