Aluminum alloy products and a method of preparation

Patent metadata

Field	Value
Publication number	US-2016115575-A1
Application number	US-201514924956-A
Country	US
Kind code	A1
Filing date	Oct 28, 2015
Priority date	Oct 28, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

The present invention relates to aluminum alloy products that can be riveted and possess excellent ductility and toughness properties. The present invention also relates to a method of producing the aluminum alloy products. In particular, these products have application in the automotive industry.

First claim

What is claimed is:

1 . An aluminum alloy sheet, comprising Cu 0.40-0.80 wt. %, Fe 0-0.40 wt. %, Mg 0.40-0.90 wt. %, Mn 0-0.40 wt. %, Si 0.40-0.7 wt. %, Cr 0-0.2 wt. %, Zn 0-0.1 wt. % and Ti 0-0.20 wt. % with trace element impurities 0.10 wt. % maximum, remainder Al.

2 . The aluminum alloy sheet of claim 1 , comprising Cu 0.45-0.75 wt. %, Fe 0.1-0.35 wt. %, Mg 0.45-0.85 wt. %, Mn 0.1-0.35 wt. %, Si 0.45-0.65 wt. %, Cr 0.02-0.18 wt. %, Zn 0-0.1 wt. % and Ti 0.05-0.15 wt. % with trace element impurities 0.10 wt. % maximum, remainder Al.

3 . The aluminum alloy sheet of claim 1 , comprising Cu 0.45-0.65 wt. %, Fe 0.1-0.3 wt. %, Mg 0.5-0.8 wt. %, Mn 0.15-0.35 wt. %, Si 0.45-0.65 wt. %, Cr 0.02-0.14 wt. %, Zn 0.0-0.1 wt. % and Ti 0.05-0.12 wt. % with trace element impurities 0.10 wt. % maximum, remainder Al.

4 . The aluminum alloy sheet of claim 1 , comprising Cu 0.51-0.59 wt. %, Fe 0.22-0.26 wt. %, Mg 0.66-0.74 wt. %, Mn 0.18-0.22 wt. %, Si 0.57-0.63 wt. %, Cr 0.06-0.1 wt. %, Zn 0.0-0.1 wt. % and Ti 0-0.08 wt. % with trace element impurities 0.10 wt. % maximum, remainder Al.

5 . The aluminum alloy sheet of claim 1 , comprising Cu 0.51-0.59 wt. %, Fe 0.22-0.26 wt. %, Mg 0.66-0.74 wt. %, Mn 0.18-0.22 wt. %, Si 0.55-0.6 wt. %, Cr 0.06-0.1 wt. %, Zn 0.0-0.1 wt. % and Ti 0-0.08 wt. % with trace element impurities 0.10 wt. % maximum, remainder Al.

6 . The aluminum alloy sheet of claim 1 , having a strength of at least 250 MPa.

7 . The aluminum alloy sheet of claim 1 , having a strength of at least 260 MPa.

8 . The aluminum alloy sheet of claim 1 , having a strength of at least 290 MPa.

9 . The aluminum alloy sheet of claim 1 , having sufficient ductility or toughness to meet an r/t bendability of 0.8 or less.

10 . The aluminum alloy sheet of claim 1 , having sufficient ductility or toughness to meet an r/t bendability of 0.4 or less.

11 . The aluminum alloy sheet of claim 1 , having sufficient ductility or toughness to meet an r/t bendability of 0.8 or less and having a strength of least 260 MPa.

12 . The aluminum alloy sheet of claim 1 , having sufficient ductility or toughness to meet an r/t bendability of 0.8 or less and having a strength of least 290 MPa.

13 . The aluminum alloy sheet of claim 1 , having sufficient ductility or toughness to meet an r/t bendability of 0.4 or less and having a strength of least 260 MPa.

14 . The aluminum alloy sheet of claim 1 , having sufficient ductility or toughness to meet an r/t bendability of 0.4 or less and having a strength of least 290 MPa.

15 . The aluminum alloy sheet of claim 1 , wherein the alloy sheet comprises a plurality of dispersoids.

16 . An automotive body part comprising the aluminum alloy of claim 1 .

17 . A method of producing a metal sheet, comprising:
direct chill casting an aluminum alloy to form an ingot, wherein the aluminum alloy comprises Cu 0.40-0.80 wt. %, Fe 0-0.40 wt. %, Mg 0.40-0.90 wt. %, Mn 0-0.40 wt. %, Si 0.40-0.7 wt. %, Cr 0-0.2 wt. %, Zn 0-0.1 wt. % and Ti 0-0.20 wt. % with trace element impurities 0.10 wt. % maximum, remainder Al; homogenizing the ingot; hot rolling the ingot to produce a hot band; and cold rolling the hot band to a sheet having a final gauge thickness.

18 . The method of claim 17 , further comprising subjecting the sheet to a solution heat treatment at a temperature of from about 450° C. to about 575° C.

19 . The method of claim 18 , further comprising subjecting the sheet to an artificial aging process.

20 . An aluminum sheet made according to the method of claim 17 .

Assignees

• Novelis Inc

Inventors

• Bull Michael
• Kamat Rajeev G

Classifications

• C22C21/16 Primary

  with magnesium · CPC title

• C22F1/057

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

• C22C21/14

  with silicon · CPC title

• C22C21/08 Primary

  with silicon · CPC title

• B22D15/00

  Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor · CPC title