Al-Cu ALLOY WITH HIGH TOUGHNESS

Inactive Publication Date: 2008-03-13
ALERIS ALUMINUM KOBLENZ GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] It is a preferred object of the present invention to provide a high damage tolerant AA2xxx-type alloy rolled product h

Problems solved by technology

However, it is believed that such low magnesium levels have a negative influence with regard to the alloy's resistance to corrosion, its response to natural aging and its strength level.
However, such alloy has the disadvantage that it is quite ex

Method used

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Examples

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Example

EXAMPLE

[0056] On an industrial scale 7 different aluminum alloys have been cast into ingots having the following chemical composition as set out in TABLE 1. TABLE 1Chemical composition of the DC-cast aluminum alloys,in weight %, Si about 0.05%, Fe about 0.06%,balance aluminum and inevitable impurities.AlloyCuMnMgZrCrAA20244.40.591.5100AA25244.30.511.390014.70.511.050024.60.441.200.09034.80.511.020044.90.501.2000 5*4.20.461.1500 6*4.20.311.1500.1074.00.301.130.100

*hot deformation at different temperatures

[0057] The alloys have been processed to a 2.0 mm sheet in the T351 temper. The cast ingots were homogenized at about 490° C., and then hot rolled at 410° C. Alloys No. 5 and 6 hot deformed at about 460° C.

[0058] Thereafter, the plates were further cold rolled, solution heat treated and stretched by about 1%. All alloys have been tested at least after 10 days of natural aging. All alloys were tested in comparison with two reference alloys. As shown in Table 1 AA2024 and AA2524 al...

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PUM

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Abstract

Disclosed is an Al—Cu alloy of the AA2000-series alloys with high toughness and an improved strength, including the following composition (in weight percent) Cu 4.5-5.5, Mg 0.5-1.6, Mn≦0.80, Zr≦0.18, Cr≦0.18, Si≦0.15, Fe≦0.15, the balance essentially aluminum and incidental elements and impurities, and wherein the amount (in weight %) of magnesium is either: (a) in a range of 1.0 to 1.6%, or alternatively (b) in a range of 0.50 to 1.2% when the amount of dispersoid forming elements such as Cr, Zr or Mn is controlled and (in weight %) in a range of 0.10 to 0.70%.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an aluminum-copper alloy having improved combinations of toughness and strength while maintaining good resistance to fatigue crack growth, a method for producing an aluminum-copper alloy with high toughness and an improved strength and to a rolled, forged or extruded aluminum-copper alloy sheet or plate product with high toughness and an improved strength for aeronautical applications. More specifically, the present invention relates to a high damage tolerant (“HDT”) aluminum-copper alloy designated by the Aluminum Association (“AA”)2xxx-series for structural aeronautical applications with improved properties such as fatigue crack growth resistance, strength and fracture toughness. The alloy according to the invention is preferably useful for aeronautical plate applications. More specifically, the invention relates to a rolled, forged or extruded alloy product suitable to be used as fuselage skin or lower wing skin of an...

Claims

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Application Information

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IPC IPC(8): C22F1/04C22C21/12C22C21/16C22F1/057
CPCC22F1/057C22C21/16
InventorBENEDICTUS, RINZEKEIDEL, CHRISTIANHEINZ, ALFREDHASZLER, ALFREDHARGARTER, HINRICH
OwnerALERIS ALUMINUM KOBLENZ GMBH