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Al-zn-cu-mg alloys with high strength and method of fabrication

a technology of aluminum base alloys and high strength, applied in the direction of spars/stringers, transportation and packaging, wings, etc., can solve the problems of difficult mastery and long three-step aging, and achieve the effect of improving mechanical strength

Pending Publication Date: 2020-07-23
CONSTELLIUM ISSOIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about an alloy that includes specific amounts of aluminum, zinc, copper, and magnesium. This alloy can be used to make rolled aluminum products with improved strength, fracture toughness, and resistance to extreme stress and humid environments. The invention also provides a manufacturing process for making these products.

Problems solved by technology

Again, such three step aging is long and difficult to master.

Method used

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  • Al-zn-cu-mg alloys with high strength and method of fabrication

Examples

Experimental program
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example

Example 1

[0100]Four ingots were cast, one of a product according to the invention (D), and three reference examples with the following composition (Table 1):

TABLE 1composition (wt. %) of cast according to the invention and of reference casts.AlloySiFeCuMgZnTiZrA0.0200.0451.691.828.420.0220.10B0.0290.0591.591.876.390.0210.06C0.0460.0631.701.766.450.0330.11D0.0230.0461.892.147.020.0370.10

[0101]The ingots were then scalped and homogenized at 473° C. (alloy A) or 479° C. (alloys B to D). The ingots were hot rolled to a plate of thickness of 120 mm (alloy A), 100 mm (alloy B) or 102 mm (alloys C and D). The plates were solution heat treated with a soak temperature of 473° C. (alloy A) or 479° C. (alloys B to D). The plates were quenched and stretched with a permanent elongation comprised between 2.0 and 2.5%.

[0102]The plates were submitted to a two step aging of 4 hours at 120° C. followed by between 14 and 32 hours at 155° C. for a total equivalent time at 155° C. between 17 and 35 hour...

example 2

[0111]Three ingots were cast, according to the invention with the following composition (Table 5):

TABLE 5composition (wt. %)AlloySiFeCuMgZnTiZrE0.0340.0712.092.057.190.0320.10F0.0290.0622.132.027.120.0320.10G0.0270.0552.112.017.140.0330.10

[0112]The ingots were then scalped and homogenized at 479° C. The ingots were hot rolled to a plate of thickness of 76 mm and 152 mm (alloy E), 102 mm and 200 mm (alloy F) or 127 mm (alloy G). The plates were solution heat treated with a soak temperature of 479° C. The plates were quenched and stretched with a permanent elongation comprised between 2.0 and 2.5%.

[0113]The plates were submitted to a two step aging of 4 hours at 120° C. followed by between 14 and 32 hours at 155° C. for a total equivalent time at 155° C. between 22 and 35 hours.

[0114]All the samples tested were substantially unrecrystallized, with a volume fraction of recrystallized grains lower than 35%.

[0115]The samples were mechanically tested, at quarter-thickness for L and LT dir...

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Abstract

The invention relates to a rolled product made of aluminum alloy with a thickness of at least 50 mm comprising (in weight %): Zn 6.9-7.5; Mg 1.8-2.2; Cu 1.8-2.2, where the sum Cu+Mg is between 3.8 and 4.2; Zr 0.04-0.14; Mn 0-0.1; Ti 0-0.15; V 0-0.1; Fe≤0.15; If≤0.15; impurities ≤0.05 each and ≤0.15 total, balance aluminum. The invention also relates to the method of manufacturing such a product. The products according to the invention are particularly advantageous because they have a very favorable compromise between static mechanical strength, toughness and environmental-assisted cracking performance under conditions of high stress and humid environment.

Description

FIELD OF THE INVENTION[0001]The present invention relates generally to aluminum base alloys and more particularly, Al—Zn—Cu—Mg aluminum base alloys, in particular for aerospace applications.DESCRIPTION OF RELATED ART[0002]Al—Zn—Cu—Mg aluminum base alloys have been used extensively in the aerospace industry for many years. With the evolution of airplane structures and efforts directed towards the goal of reducing both weight and cost, an optimum compromise between properties such as strength, toughness and corrosion resistance is continuously sought. Also, process improvements in casting, rolling and heat treatment can advantageously provide further control in the composition diagram of an alloy.[0003]Thick rolled products made of Al—Zn—Cu—Mg aluminum base alloys are used in particular to produce integrally machined high strength structural parts for the aeronautic industry, for example wing elements such as wing ribs, spars, frames and the like, which are typically machined from thi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C21/10C22F1/053B64C3/18
CPCC22F1/053B64C3/185B64C3/187C22C21/10
Inventor WHELCHEL, RICKYNIZERY, EREMBERTKOSCHEL, DIANAEHRSTROM, JEAN-CHRISTOPHEWARNER, TIMOTHY
Owner CONSTELLIUM ISSOIRE