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Aluminum alloy that is not sensitive to quenching, as well as method for the production of a semi-finished product therefrom

a technology of aluminum alloy and quenching, applied in the field of aluminum alloy, can solve the problems of achieving uniform high degree of quenching with great effort and expense, and achieve the effect of reducing inherent stresses

Inactive Publication Date: 2006-07-20
OTTO FUCHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The invention relates to a high-strength aluminum alloy that is not sensitive to quenching, having the same or better strength properties as the alloys AA 7010 and AA 7050 which, at the same time, has lower inherent tensions due to quenching after cold forming, and from which semi-finished products having a medium thickness can be produced having great strength and fracture resistance, without the need for a cold forming step to reduce inherent tensions induced by quenching.

Problems solved by technology

With geometrically complicated forged pieces, on the other hand, it is only possible to achieve a uniformly high degree of upsetting with great effort and expense, if it is even possible at all.

Method used

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  • Aluminum alloy that is not sensitive to quenching, as well as method for the production of a semi-finished product therefrom
  • Aluminum alloy that is not sensitive to quenching, as well as method for the production of a semi-finished product therefrom
  • Aluminum alloy that is not sensitive to quenching, as well as method for the production of a semi-finished product therefrom

Examples

Experimental program
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Effect test

example 1

[0038] After the casting skin of the blocks produced in this manner had been lathed off, the homogenized blocks were pre-heated to 370° C. and formed multiple times to produce free-form forged pieces having a thickness of 250 mm and to a width of 500 mm.

[0039] Subsequently, the free-form forged pieces of alloy Z1 and Z2 were solution heat treated at 485° C. for at least 4 hours, quenched in water at room temperature, and subsequently artificially aged between 100° C. and 160° C., wherein the artificial aging was carried out in two stages. In the first stage, the semi-finished product was heated to more than 100° C. and held at this temperature for more than eight hours. The second stage, which was carried out immediately after the first stage, took place at a temperature of more than 130° C. for more than five hours.

[0040] Drawing samples were taken from the artificially aged free-form forged pieces, on which the strength properties at room temperature were determined in the sampl...

example 2

[0046] In another series of experiments, free-form forged pieces having a thickness of 150 mm and a width of 500 mm were produced from alloy Z1 and, after solution heat treatment, were quenched in water or a water / glycol mixture with approximately 20% and approximately 40%, respectively, and warm settled as described above. One forged piece was additionally cold upset after being quenched in water. The influence of the various cooling media was determined on drawn samples that were taken from the forged pieces in the directions “long” (L), “long-transverse” (LT), and “short-transverse” (ST). The average strength properties of the alloy for a thickness of 150 mm for various cooling treatments are shown as follows:

QuenchingRp0.2RmA5MediumStress Direction(MPa)(MPa)(%)Water(RT)L55157310.3LT5155447.5ST5055498.0Water (RT) +L49153712.8Cold upsettingLT4655208.7ST4305138.5Water / GlycolL54556612.5(16-20%)LT5205477.2ST5125488.3Water / GlycolL50352912.2(38-40%)LT4935255.0ST4875265.6

[0047] The re...

example 3

[0050] To determine the strength properties, the alloy Z1 was also cast in another example, analogous to the first example, and blocks for extrusion were produced.

[0051] After the casting skin had been lathed off, the homogenized blocks were pre-heated to over 370° C. and pressed into extrusion profiles having a rectangular cross-section, with a thickness of 40 mm and a width of 100 mm.

[0052] Subsequently, the profiles were solution heat treated for at least 4 hours at 485° C., quenched in water at room temperature, and subsequently artificially aged between 100° C. and 160° C., in two stages (first stage: >100° C., >8 h; second stage: >130° C., >5 h).

[0053] Drawn samples were taken from the artificially aged extrusion profiles, on which the strength properties were determined at room temperature, in the sample positions “long” (L), “long-transverse” (LT), and “short-transverse” (ST). The average strength properties of the alloy Z1 for an extruded rectangular profile (40×100 mm) ...

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Abstract

An aluminum alloy that is not sensitive to quenching, for the production of high-strength forged pieces that are low in inherent tension, and high-strength extruded and rolled products, consisting of: 7.0-10.5 wt. % zinc, 1.0-2.5 wt. % magnesium, 0.1-1.15 wt. % copper, 0.06-0.25 wt. % zirconium, 0.02-0.15 wt. % titanium, at most 0.5 wt. % manganese, at most 0.6 wt. % silver, at most 0.10 wt. % silicon, at most 0.10 wt. % iron, at most 0.04 wt. % chrome, and at least one element selected from the group consisting of: hafnium, scandium, strontium and / or vanadium with a summary content of at most 1.0 wt. %. The alloy can also contain contaminants at proportions of at most 0.05 wt. % per element and a total proportion of at most 0.15 wt. %, wherein the remaining component includes aluminum. The sum of the alloy elements zinc and magnesium and copper is at least 9 wt. %. Furthermore, there can also be a method for the production of a high-strength semi-finished product low in inherent tension from this alloy.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application hereby claims priority from German application Serial no. 102005002390.8 filed on Jan. 19, 2005 the disclosure of which is hereby incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] The invention relates to an aluminum alloy that is not sensitive to quenching, and which is used for the production of high-strength forged pieces low in inherent tension, and high-strength extruded and rolled products. Furthermore, the invention relates to a method for the production of a semi-finished product from such an aluminum alloy. [0003] High-strength aluminum alloys are needed for the aeronautics and space industry, in particular, bearing hull, wing, and chassis parts which demonstrate high strength both under static stress and under dynamic stress. The required strength properties can be achieved, in the case of the aforementioned semi-finished products, by using alloys from the 7000 group (7xxx alloys), in accord...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C21/10
CPCC22C1/06Y10T428/12C22F1/053C22C21/10C22F1/002
Inventor FISCHER, GERNOTTERLINDE, GREGORHILPERT, MATTHIAS
Owner OTTO FUCHS
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