Age-hardenable and highly formable aluminum alloys and methods of making the same

Patent metadata

Field	Value
Publication number	US-11203801-B2
Application number	US-202016815996-A
Country	US
Kind code	B2
Filing date	Mar 11, 2020
Priority date	Mar 13, 2019
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

Provided herein are new aluminum alloy products and methods of making these alloys. The aluminum alloy products are age-hardenable, display high strength and formability, and allow for the use of recycled scrap. The aluminum alloys can serve as the core in a clad aluminum alloy product. The alloy products can be used in a variety of applications, including automotive, transportation, and electronics applications.

First claim

What is claimed is:

1. A clad aluminum alloy product, comprising:
a core layer having a first side and a second side; and
a first clad layer in contact with the first side of the core layer;
wherein the core layer comprises a heat-treated aluminum alloy including:
from 0.5 wt. % to 1.6 wt. % Mg;
from 0.2 wt. % to 0.5 wt. % Si;
up to 0.5 wt. % Fe;
up to 0.5 wt. % Cu;
up to 0.5 wt. % Mn;
from 0.01 wt. % to 0.3 wt. % Ti; and
balance Al, wherein a combined concentration of Fe, Mn, and Cu is at least 0.7 wt. %;
wherein the first clad layer comprises an 1xxx series aluminum alloy, 2xxx series aluminum alloy, a 3xxx series aluminum alloy, a 5xxx series aluminum alloy, a 7xxx series aluminum alloy, or an 8xxx series aluminum alloy;
wherein the core layer has an r value in all directions; and
wherein the aluminum alloy of the core layer is in T8x temper.

2. The clad aluminum alloy product of claim 1 , wherein in the aluminum alloy of the core layer:
the amount of Mg is from 0.6 wt. % to 1.5 wt. %;
the amount of Si is from 0.3 wt. % to 0.45 wt. %;
the amount of Cu is up to 0.4 wt. %;
the amount of Mn is up to 0.4 wt. %;
the amount of Cr is up to 0.25 wt. %;
the amount of Ti is from 0.01 wt. % to 0.15 wt. %;
the amount of Zn is up to 0.4 wt. %; and
the amount of impurities is up to 0.20 wt. %.

3. The clad aluminum alloy product of claim 1 , wherein in the aluminum alloy of the core layer the Mg and Si are present in a ratio of from 5:1 to 2:1 of Mg to Si by weight.

4. The clad aluminum alloy product of claim 1 , wherein in the aluminum alloy of the core layer, the Mg and Si are present in a ratio of from 4:1 to 2:1 of Mg to Si by weight.

5. The clad aluminum alloy product of claim 1 , wherein in the aluminum alloy of the core layer:
the amount of Mg is from 0.7 wt. % to 1.5 wt. %;
the amount of Si is from 0.25 wt. % to 0.45 wt. %;
the amount of Fe is from 0.01 wt. % to 0.5 wt. %;
the amount of Cu is from 0.01 wt. % to 0.5 wt. %;
the amount of Mn is from 0.01 wt. % to 0.5 wt. %;
the amount of Cr is from 0.005 wt. % to 0.3 wt. %;
the amount of Ti is from 0.01 wt. % to 0.25 wt. %;
the amount of Zn is up to 0.4 wt. %; and
the amount of impurities is up to 0.20 wt. %.

6. The clad aluminum alloy product of claim 1 , wherein the aluminum alloy of the core layer has a yield strength (Rp0.2) of from 160 MPa to 230 MPa when tested according to ISO 6892-1 (2016).

7. The clad aluminum alloy product of claim 1 , wherein the aluminum alloy of the core layer has a bake hardening value from 70 MPa to 140 MPa.

8. The clad aluminum alloy product of claim 1 , wherein the aluminum alloy of the core layer comprises at least 40 wt. % recycled content.

9. The clad aluminum alloy product of claim 1 , wherein the aluminum alloy of the core layer comprises at least 40 wt. % UBC.

10. The clad aluminum alloy product of claim 1 , wherein the combined concentration of Fe, Mn and Cu in the aluminum alloy of the core layer is at least 0.8 wt. %.

11. The clad aluminum alloy product of claim 1 , wherein the first clad layer has a thickness of from 0.05 mm to 0.80 mm.

12. The clad aluminum alloy product of claim 1 , wherein the core layer has a thickness of from 0.7 to 2.3 mm.

13. The clad aluminum alloy product of claim 1 , further comprising a second clad layer in contact with the second side of the core layer.

14. The clad aluminum alloy product of claim 1 , wherein the clad aluminum alloy product has a yield strength of at least 150.

15. The clad aluminum alloy product of claim 1 , wherein the clad aluminum alloy product is a sheet, a plate, an electronic device housing, an automotive structural part, an aerospace structural part, an aerospace non-structural part, a marine structural part, or a marine non-structural part.

16. The clad aluminum alloy product of claim 1 , wherein the core layer has an r value in all directions of at least 0.45 as measured by ISO 10113 (2006).

Assignees

• Novelis Inc

Inventors

• Mariaux Aurèle
• Despois Aude Celine
• Felberbaum Milan
• Florey Guillaume

Classifications

• C22C21/08 Primary

  with silicon · CPC title

• B32B15/016

  all layers being formed of aluminium or aluminium alloys · CPC title

• C22F1/047

  of alloys with magnesium as the next major constituent · CPC title

• Y10T428/12764

  Next to Al-base component · CPC title