Automobile body part
AssigneeNovelis Inc.
InventorsCorrado BASSI, Juergen Timm
Life of this patent
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Abstract
In a car body or component thereof with at least one first component of sheet metal of a first aluminum alloy and at least one second component of sheet metal of a second aluminum alloy, the first and second aluminum alloys are of type AlMgSi and in the sheet metal of the second aluminum alloy a substantial part of the elements Mg and Si, which are required to achieve artificial ageing in solid solution, is present in the form of separate Mg2Si and/or Si particles in order to avoid artificial ageing. By reduction of the hardening capacity of the second component during artificial ageing of the body as part of the paint baking cycle, the car body has an improved impact protection for pedestrians in comparison with solutions according to the prior art.
Claims6
A method for the production of car body sheet, the method comprising:
- (a) casting an ingot of aluminum alloy consisting essentially of the following alloy elements:
- 0.30 to 0.50 weight percent silicon;
- 0.30 to 0.50 weight percent magnesium;
- max. 0.20 weight percent copper:
- 0.05 to 0.20 weight percent iron;
- max. 0.10 weight percent manganese;
- max. 0.15 weight percent vanadium;
- and
- aluminum as the remainder with production-related contaminants;
- (b) hot rolling, cold rolling, solution annealing, and coiling a final sheet product, wherein heat treatment conditions during such processing steps precipitate Mg and Si in a form wherein Mg and Si are no longer substantially available for subsequent artificial aging.
Dependencies are inferred from the claim text.