# US 2014/0193666 A1 · Aluminium Composite Material with AlMgSi Core Layer

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- Number: US 2014/0193666 A1
- Document ID: US20140193666A1
- Status: Published application
- Kind: A1
- Application number: 14/206,153
- Filed: 2014-03-12
- Published: 2014-07-10
- Earliest claimed: 2011-09-15
- Assignees: Hydro Aluminium Rolled Products GmbH
- Inventors: Henk-Jan Brinkman; Dietmar Schröder; Thomas Wirtz; Natalie Hörster; Werner Kehl; Olaf Engler
- Web page: https://patentgrep.com/patent/US20140193666A1

## CPC

- B32B 15/016: {all layers being formed of aluminium or aluminium alloys}
- B23K 20/04: by means of a rolling mill
- B23K 20/2336: {both layers being aluminium}
- C22C 21/00: Alloys based on aluminium
- C22C 21/08: with silicon
- C22F 1/04: of aluminium or alloys based thereon
- C22F 1/05: of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
- Y10T 428/12764: Next to Al-base component
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to a strip consisting of an aluminum material for producing components with improved bending behavior and exacting shaping requirements, a method for producing the strip and the use of sheets produced from the strip according to the invention. The strip has a core layer of an AlMgSi alloy and at least one outer aluminum alloy layer arranged on one or both sides, made from a non-hardenable aluminum alloy, wherein the at least one outer aluminum layer has a lower tensile strength in the (T4) state than the AlMgSi layer, wherein the strip has a uniform strain (Ag) in the (T4) state of more than 23% transverse to the rolling direction and, at a thickness of 1.5 mm-1.6 mm, achieves a bending angle of less than 40° in a bending test.

## Claims

### Claim 1

Strip comprising an aluminium material for production of components with high forming requirements, wherein the strip comprises a core layer of an AlMgSi alloy and at least one external aluminium alloy layer arranged on one or both sides and made of a non-hardenable aluminium alloy, wherein the at least one external aluminium alloy layer has a lower tensile strength than the core layer of an AlMgSi alloy in state T4, and wherein in state T4, the strip has a uniform elongation Ag of more than 23% transverse to the rolling direction and with a thickness of 1.5 mm to 1.6 mm, a bend angle of less than 40° is achieved in a bending test transverse to the rolling direction and the at least one external aluminium alloy layer consists of an aluminium alloy type AA8xxx, AA8079 or A1200.

### Claim 2 (depends on 1)

Strip according to claim 1, wherein the strip in state T4 has a uniform elongation Ag of more than 25%.

### Claim 3 (depends on 1)

Strip according to claim 1, wherein the strip in state T4 has a yield point Rp0.2 of 70 to 140 MPa and a tensile strength Rm of 170 to 220 MPa.

### Claim 4 (depends on 1)

Strip according to claim 1, wherein the strip has an elongation at break A80 transverse to the rolling direction of at least 27%, preferably at least 29%.

### Claim 5 (depends on 1)

Strip according to claim 1, wherein the thickness of the external aluminium alloy layers in each case amounts to 5 to 15% of the final thickness of the strip.

### Claim 6 (depends on 1)

Strip according to claim 1, wherein the external aluminium alloy layers have a mean grain size of less than 50 μm, preferably less than 25 μm.

### Claim 7 (depends on 1)

Strip according to claim 1, wherein the core layer consists of an aluminium alloy of alloy type AA6xxx, preferably AA6014, AA6016, AA6060, AA6111 or AA6181.

### Claim 8 (depends on 1)

Use of a sheet produced from a strip according to claim 1 as a component, chassis or structural part or panel in automotive, aircraft or railway vehicle construction, in particular as component, chassis part, external or internal panel in automotive engineering, preferably as a bodywork element.