Aluminum-alloy clad material and method of manufacturing the same

• US 10,640,852 B2
• Filed: 03/28/2018
• Issued: 05/05/2020
• Est. Priority Date: 03/30/2017
• Status: Active Grant

• Current Assignee: UACJ Corporation
• Original Assignee: UACJ Corporation
• Inventors: Hasegawa, Akifumi, Tanaka, Hiroki
• Primary Examiner(s): Schleis, Daniel J.
• Application Number:
  US15/938,827
• Publication Number:
  US 20180282843A1
• Time in Patent Office: 769 Days
• Field of Search: None
• CPC Class Codes: B32B 15/016 all layers being formed of aluminium or aluminium alloys
• CPC Class Codes: C22C 21/00 Alloys based on aluminium
• CPC Class Codes: C22C 21/14 with silicon
• CPC Class Codes: C22C 21/16 with magnesium
• CPC Class Codes: C22C 21/18 with zinc
• CPC Class Codes: C22F 1/04 of aluminium or alloys based thereon
• CPC Class Codes: Y10T 428/12764 Next to Al-base component

Abstract

An aluminum-alloy clad material includes a skin layer clad to and covering at least one surface of a core layer. The core layer is composed of an aluminum alloy containing Cu: 3.8-4.9 mass %, Mg: 1.2-1.8 mass % and Mn: 0.3-0.9 mass %. The core layer has an area number density of microvoids that have a circle-equivalent diameter of 0.5 μm or greater that is 100/mm² or less. The skin layer has an Al purity of 99.5 mass % or greater. A method of manufacturing a wrought material from such an aluminum-alloy clad material includes heating the wrought material to the solution heat treatment temperature of the core layer at a temperature-rise rate of 50° C.-200° C./h.

Claims

1. An aluminum-alloy clad material comprising:

a skin layer clad to and covering at least one surface of a core layer,

wherein the core layer is composed of an aluminum alloy containing Cu;

3.8-4.9 mass %, Mg;

1.2-1.8 mass % and Mn;

0.3-0.9 mass %,

the core layer has an area number density of microvoids that have a circle-equivalent diameter of 0.5 μ

m or greater that is 100/mm² or less, and

the skin layer has an Al purity of 99.5 mass % or greater.

2. The aluminum-alloy clad material according to claim 1, wherein the core layer further contains Si:

0.020-0.20 mass % and Fe;

0.020-0.20 mass %.

3. The aluminum-alloy clad material according to claim 2, wherein the core layer contains Mn:

0.42-0.57 mass %.

4. The aluminum-alloy clad material according to claim 3, wherein the core layer further contains Cr:

0.02-0.06 mass %.

5. The aluminum-alloy clad material according to claim 4, wherein the core layer further contains Zn:

0.04-0.20 mass %.

6. The aluminum-alloy clad material according to claim 5, wherein the core layer further contains Ti:

0.01-0.15 mass %.

7. The aluminum-alloy clad material according to claim 1, wherein the core layer consists of Cu:

3.8-4.9 mass %, Mg;

1.2-1.8 mass %, Fe;

0.020-0.20 mass %, Si;

0.020-0.20 mass %, Mn;

0.42-0.57 mass %, Cr;

0.02-0.06 mass %, Zn;

0.04-0.20 mass %, and Ti;

0.01-0.15 mass %, the remainder being Al and unavoidable impurities.

8. The aluminum-alloy clad material according to claim 7, wherein the area number density of microvoids that have a circle-equivalent diameter of 0.5 μ

m or greater that is 65/mm² or less.

9. The aluminum-alloy clad material according to claim 1, produced by a process comprising:

preparing an ingot of the core layer;

preparing an ingot of the skin layer;

clad bonding the ingot of the core layer to the ingot of the skin layer to form a laminated material;

subjecting the laminated material to a homogenization treatment by heating the laminated material at a temperature of 495°

C.−

500°

C. for 1 h or more;

hot working the laminated material to form a wrought material; and

subjecting the wrought material to a solution heat treatment by heating the wrought material to a solution heat treatment temperature of the core material or higher with the proviso that, after the wrought material reaches 100°

C. until the wrought material reaches the solution heat treatment temperature of the core material, the wrought material is heated at a temperature-rise rate of 50°

C.−

200°

C./h, whereby the aluminum-alloy clad material according to claim 1 is formed.

10. The aluminum-alloy clad material according to claim 9, wherein prior to performing the solution heat treatment, the ingot of the core layer contains less than 0.2 ml of hydrogen per 100 g of the core layer.

11. The aluminum-alloy clad material according to claim 10, wherein the solution heat treatment temperature is 480°

C.−

490°

C.

12. The aluminum-alloy clad material according to claim 11, wherein the solution heat treatment time is 30-120 minutes.

13. The aluminum-alloy clad material according to claim 12, wherein the temperature-rise rate during the solution heat treatment is 130°

C.−

185°

C./h.

14. The aluminum-alloy clad material according to claim 13, wherein prior to performing the solution heat treatment, the ingot of the core layer contains 0.09-0.16 ml of hydrogen per 100 g of the core layer.

15. The aluminum-alloy clad material according to claim 14, wherein the core layer further contains Fe:

0.020-0.20 mass % and Si;

0.020-0.20 mass %.

16. The aluminum-alloy clad material according to claim 15, wherein the core layer contains Mn:

0.42-0.57 mass %, and further contains Cr;

0.02-0.06 mass %, Zn;

0.04-0.20 mass % and Ti;

0.01-0.15 mass %.

17. The aluminum-alloy clad material according to claim 14, wherein the core layer consists of Cu:

3.8-4.9 mass %, Mg;

1.2-1.8 mass %, Fe;

0.020-0.20 mass %, Si;

0.020-0.20 mass %, Mn;

0.42-0.57 mass %, Cr;

0.02-0.06 mass %, Zn;

0.04-0.20 mass %, and Ti;

0.01-0.15 mass %, the remainder being Al and unavoidable impurities.

18. An aluminum-alloy clad material comprising:

a skin layer clad to and covering at least one surface of a core layer,

wherein the core layer is composed of an aluminum alloy containing Cu;

3.8-4.9 mass % and Mg;

1.2-1.8 mass %,

the core layer has an area number density of microvoids that have a circle-equivalent diameter of 0.5 μ

m or greater that is 100/mm² or less, and

the skin layer has an Al purity of 99.5 mass % or greater.

19. The aluminum-alloy clad material according to claim 18, wherein the core layer further contains Mn:

0.3-0.9 mass %, Cr;

0.1 mass % or less and Zn;

0.3 mass % or less.

20. The aluminum-alloy clad material according to claim 18, produced by a process comprising:

preparing an ingot of the core layer;

preparing an ingot of the skin layer;

clad bonding the ingot of the core layer to the ingot of the skin layer to form a laminated material;

subjecting the laminated material to a homogenization treatment by heating the laminated material at a temperature of 495°

C.−

500°

C. for 1 h or more;

hot working the laminated material to form a wrought material; and

subjecting the wrought material to a solution heat treatment by heating the wrought material to a solution heat treatment temperature of the core material or higher with the proviso that, after the wrought material reaches 100°

C. until the wrought material reaches the solution heat treatment temperature of the core material, the wrought material is heated at a temperature-rise rate of 50°

C.−

200°

C./h, whereby the aluminum-alloy clad material according to claim 18 is formed.