Aluminum alloy products and a method of preparation

Patent metadata

Field	Value
Publication number	US-11193192-B2
Application number	US-201514924956-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Oct 28, 2014
Publication date	Dec 7, 2021
Grant date	Dec 7, 2021

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 0.40-0.8 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, and Al,
wherein the aluminum alloy sheet has a yield strength of at least 300 MPa and an r/t bendability ratio of 0.8 or less,
wherein the aluminum alloy sheet comprises a plurality of dispersoid particles having an average size from 0.008 μm 2 to 2 μm 2 , and
wherein a number of dispersoid particles per 200 μm 2 is greater than 500 particles.

2. The aluminum alloy sheet of claim 1 , comprising Cu 0.45-0.75 wt. %, Fe 0.1-0.35 wt. %, Mg 0.45-0.8 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, and 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, and 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, and 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, and Al.

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

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

8. The aluminum alloy sheet of claim 1 , wherein the number of dispersoid particles per 200 μm 2 is greater than 1000 particles.

9. The aluminum alloy sheet of claim 1 , wherein the aluminum alloy sheet comprises from 0 wt. % to 0.10 wt. % excess Si for forming Mg 2 Si.

10. An aluminum alloy sheet, comprising Cu 0.45-0.65 wt. %, Fe 0-0.40 wt. %, Mg 0.40-0.8 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, and Al,
wherein the aluminum alloy sheet has a yield strength of at least 300 MPa and an r/t bendability ratio of 0.8 or less,
wherein the aluminum alloy sheet comprises a plurality of dispersoid particles having an average size from 0.008 μm 2 to 2 μm 2 , and
wherein a number of dispersoid particles per 200 μm 2 is greater than 500 particles.

11. The aluminum alloy sheet of claim 10 , wherein the aluminum alloy sheet comprises from 0 wt. % to 0.10 wt. % excess Si for forming Mg 2 Si.

Assignees

• Novelis Inc

Inventors

• Bull Michael
• Kamat Rajeev G

Classifications

• C22F1/05

  of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions · CPC title

• C22C21/14

  with silicon · CPC title

• C22C21/16 Primary

  with magnesium · CPC title

• C22C21/08 Primary

  with silicon · CPC title

• C22F1/047

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