Rapid aging of high strength 7xxx aluminum alloys and methods of making the same

Patent metadata

Field	Value
Publication number	US-2018202031-A1
Application number	US-201815872126-A
Country	US
Kind code	A1
Filing date	Jan 16, 2018
Priority date	Jan 17, 2017
Publication date	Jul 19, 2018
Grant date	—

Abstract

Disclosed herein are methods of processing 7 xxx aluminum alloys using a rapid pre-aging step, along with alloys prepared according to the methods. The aluminum alloy products described herein have high strength when subjected to a rapid pre-aging step, as described above, and subsequent thermal treatment, such as paint baking or coating. The alloys prepared and processed according to the methods described herein can be used, for example, in automotive, transportation, electronics, and industrial applications.

First claim

What is claimed is:

1 . A method of processing an aluminum alloy metal product, comprising:
solutionizing a sheet, a plate, or a shate at a temperature of at least about 460° C.; quenching and deforming the sheet, the plate, or the shate to produce an aluminum alloy article; and pre-aging the aluminum alloy article by heating the aluminum alloy article to a temperature of from about 100° C. to about 225° C. for a period of time less than about 2 hours.

2 . The method of claim 1 , wherein the quenching is performed before the deforming in the quenching and deforming step.

3 . The method of claim 1 , wherein the deforming is performed before the quenching in the quenching and deforming step.

4 . The method of claim 1 , wherein the quenching and deforming are performed simultaneously in the quenching and deforming step.

5 . The method of claim 1 , wherein the temperature in the pre-aging step is from about 100° C. to about 125° C.

6 . The method of claim 1 , wherein the period of time in the pre-aging step is about 60 minutes or less.

7 . The method of claim 1 , wherein the period of time in the pre-aging step is from about 10 minutes to about 45 minutes.

8 . The method of claim 1 , further comprising thermally treating the aluminum alloy article after the pre-aging step.

9 . The method of claim 8 , wherein the thermally treating step comprises paint baking.

10 . The method of claim 9 , wherein the paint baking is performed by heating the aluminum alloy article to a temperature of from about 100° C. to about 225° C. for a period of time up to about 2 hours.

11 . The method of claim 1 , wherein the aluminum alloy metal product comprises a 7xxx series aluminum alloy metal product.

12 . The method of claim 1 , wherein the aluminum alloy metal product is prepared from a monolithic alloy.

13 . The method of claim 1 , wherein the aluminum alloy metal product is prepared from a clad aluminum alloy product having a core layer and at least one clad layer.

14 . A product prepared according to a method comprising:
solutionizing a sheet, a plate, or a shate at a temperature of at least about 460° C.; quenching and deforming the sheet, the plate, or the shate to produce an aluminum alloy article; and pre-aging the aluminum alloy article by heating the aluminum alloy article to a temperature of from about 100° C. to about 225° C. for a period of time less than about 2 hours.

15 . The product of claim 14 , wherein the product has a yield strength of at least about 460 MPa.

16 . The product of claim 14 , wherein the product has a yield strength of at least about 480 MPa.

17 . The product of claim 14 , wherein the product is an automotive body part.

18 . The automotive body part of claim 17 , wherein the automotive body part is a bumper, a side beam, a roof beam, a cross beam, a pillar reinforcement, an inner panel, an outer panel, a side panel, an inner hood, an outer hood, or a trunk lid panel.

19 . The product of claim 14 , wherein the product is an aerospace body.

20 . The product of claim 14 , wherein the product is an electronic device housing.

Assignees

• Novelis Inc

Inventors

• Wu Cedric
• Kulkarni Rahul Vilas
• Kamat Rajeev G
• Mohanty Rashmi Ranjan
• Talla Rajasekhar

Classifications

• B32B15/01

  all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} · CPC title

• C22F1/002

  by rapid cooling or quenching; cooling agents used therefor · CPC title

• C22F1/053 Primary

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

• C22C21/10

  with zinc as the next major constituent · CPC title