High-entropy alloys with high strength

Patent metadata

Field	Value
Publication number	US-11530468-B2
Application number	US-201917251769-A
Country	US
Kind code	B2
Filing date	Jun 11, 2019
Priority date	Jun 12, 2018
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

The disclosure provides high strength high-entropy alloys with compositions (in atomic %) of Fe a Ni b Mn c Al d Cr e C f where 37-43 atomic %, b is 8-14 atomic %, c is 27-33 atomic %, d is 4-10 atomic %, e is 10-14 atomic %, and f is 0-2 atomic %.

First claim

We claim:

1. A high-entropy alloy (HEA) having a formula of Fe a Ni b Mn c Al d Cr e C f wherein a is between 37-43 atomic %, b is between 8-14 atomic %, c is between 27-33 atomic %, d is between 4-10 atomic %, e is between 10-14 atomic %, and f is between 0-2 atomic %, wherein the HEA has a three-phase structure which comprises FeMn-enriched laths and NiAl-rich precipitates inside Cr-concentrated regions.

2. The HEA of claim 1 , wherein f is between 0.5 and 1.1 atomic %.

3. The HEA of claim 1 having the formula Fe 40.2 Ni 11.3 Mn 30 Al 7.5 Cr 11 , wherein the composition is expressed in terms of atomic percentages.

4. The HEA of claim 1 , wherein the HEA has a yield strength of at least 400 MPa at room temperature.

5. The HEA of claim 1 , wherein the HEA has a yield strength of at least 450 MPa at room temperature.

6. The HEA of claim 1 , wherein the HEA has a yield strength of at least 500 MPa at room temperature.

7. The HEA of claim 1 , wherein the HEA has a yield strength of at least 550 MPa at room temperature.

8. The HEA of claim 1 , wherein the HEA has a ductility of at least 20%.

9. The HEA of claim 1 , wherein the HEA has a ductility of at least 22%.

10. A high-entropy alloy (HEA) having a formula of Fe a Ni b Mn c Al d Cr e , wherein a is between 37-43 atomic %, b is between 8-14 atomic %, c is between 27-33 atomic %, d is between 4-10 atomic %, and e is between 10-14 atomic %, wherein the HEA comprises a Cr-rich, b.c.c. and Fe,Mn-rich f.c.c. dendritic-interdendritic microstructure with Ni-rich particles dispersed within the Cr-rich region.

11. A multiphase high-entropy alloy (HEA) FeNiMnAlCr, comprising
Fe in an amount of between 37-43 atomic %;
Ni in an amount of between 8-14 atomic %;
Mn in an amount of between 27-33 atomic %;
Al in an amount of between 4-10 atomic %; and
Cr in an amount of between 10-14 atomic %,
wherein the HEA has a three-phase structure which comprises FeMn-enriched laths and NiAl-rich precipitates inside Cr-concentrated regions.

12. The multiphase HEA of claim 11 , further comprising C in an amount of 0-2 atomic %.

13. The multiphase HEA of claim 11 having the formula Fe 40.2 Ni 11.3 Mn 30 Al 7.5 Cr 11 , wherein the composition is expressed in terms of atomic percentages.

Assignees

• Dartmouth College

Inventors

• Wu Margaret
• Baker Ian

Classifications

• C22C38/40 Primary

  with nickel · CPC title

• C22C38/06

  containing aluminium · CPC title

• C22C30/00 Primary

  Alloys containing less than 50% by weight of each constituent · CPC title

• C22C38/58

  with more than 1.5% by weight of manganese · CPC title

• C22C2202/00

  Physical properties · CPC title