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Aluminum-Copper-Lithium Alloy With Improved Mechanical Strength and Toughness

a technology of copper-lithium alloy and mechanical strength, applied in the field of aluminum-copper-lithium alloy products, can solve the problems of quench sensitive products, reduced yield strength, and reduced strength

Active Publication Date: 2011-09-01
CONSTELLIUM ISSOIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is about a method to make an aluminum-based product with specific properties. The method involves creating a liquid metal bath with specific amounts of copper, lithium, magnesium, zirconium, silver, manganese, iron, silicon, chromium, scandium, and other elements. The liquid metal is then cast into an unwrought shape and homogenized at a high temperature. The shape is then hot and cold worked into an extruded, rolled, or forged product. The product is solution heat treated, stretched, and aged to achieve the desired properties. The invention also includes a structural element made from the described method. The technical effects of the invention include improved strength and ductility of aluminum-based products."

Problems solved by technology

It is said that a product is quench sensitive if these static mechanical properties, such as the yield strength, decrease when the quenching rate decreases.

Method used

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  • Aluminum-Copper-Lithium Alloy With Improved Mechanical Strength and Toughness
  • Aluminum-Copper-Lithium Alloy With Improved Mechanical Strength and Toughness
  • Aluminum-Copper-Lithium Alloy With Improved Mechanical Strength and Toughness

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0096] In this example, a plurality of slabs with dimensions 2000×380×120 mm of which the composition is provided in table 1 were cast.

TABLE 1Composition in weight % and density ofAl—Cu—Li alloys cast in plate form. (Ref: reference;Inv: invention).DensitySiFeCuMnMgZnAgLiZr(g / cm3)10.0120.0223.540.380.32—0.240.890.102,706(Ref)20.0120.0233.530.380.32——0.910.102,699(Ref)30.0120.0323.530.380.67—0.250.930.102,698(Inv)40.0110.0223.5 0.380.67——0.940.102,692(Inv)50.0780.0883.520.380.34—0.250.910.102,705(Ref)60.0150.0293.500.390.310.390.240.950.102,707(Ref)

Ti: target 0.02% by weight for alloys 1 to 6

[0097] The slabs were homogenized at around 500° C. for around 12 hours, then cut and scalped so as to obtain parts with dimensions of 400×335×90 mm. The parts were hot rolled to obtain plates with a thickness of 20 mm. The plates were solution treated at 505+ / −2° C. for 1 h, quenched with water at 75° C. so as to obtain a cooling rate of around 18° C. / s and thus simulate the properties obtaine...

example 2

Reference

[0101] In this example, a plurality of slabs with a thickness of 406 mm of which the composition is provided in table 3 were cast.

TABLE 3Composition in weight % and density ofAl—Cu—Li alloys cast in plate form.DensityAlloySiFeCuMnMgZnAgLiZr(g / cm3) 820500.030.063.510.410.3 0.020.370.840.092,713(Ref)211183 921950.030.044.2 0.4 0.351.060.112,700(Ref)1764721021950.030.053.870.020.310.010.351.060.112,695(Ref)271257

[0102] The slabs were homogenized, then scalped. After homogenization, the slabs were hot rolled in order to obtain plates with a thickness of 50 mm. The plates were solution treated, quenched with cold water and stretched with a permanent elongation of between 3.5% and 4.5%

[0103] The plates were then subjected to aging for between 10 h and 50 h at 155° C. Samples were obtained at half-thickness in order to measure the static mechanical tensile properties as well as the toughness KQ. The test pieces used to measure the toughness had a width W=80 mm and a thickness ...

example 3

[0105] In this example, a plurality of slabs with dimensions 2000×380×120 mm of which the composition is provided in table 5 were cast.

TABLE 5Composition in weight % and density ofAl—Cu—Li alloys cast in plate form. (Ref: reference;Inv: invention).DensitySiFeCuMnMgZnAgLiTiZr(g / cm3)110,0350,0593,560,350,32—0,250,900,030,112,706(Ref)120,0350,0583,660,350,68—0,250,890,020,122,702(Inv)130,0360,0593,570,341,16—0,250,860,020,122,697(Ref)

[0106] The slabs were homogenized fat around 500° C. for around 12 hours, then cut and scalped so as to obtain parts with dimensions of 400×335×90 mm. The parts were hot rolled to obtain plates with a thickness of 20 mm. The plates were solution treated at 505+ / −2° C. for 1 h, and quenched with cold water. The plates were then stretched with a permanent elongation of 3.5%.

[0107] The plates were subjected to artificial aging for between 18 h and 72 h at 155° C. Samples were taken at half-thickness in order to measure the static mechanical tensile propert...

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Abstract

The invention relates to a wrought product such as an extruded, rolled and / or forged aluminum alloy-based product comprising, in weight %: Cu: 3.0-3.9; Li: 0.8-1.3; Mg; 0.6-1.0; Zr: 0.05-0.18; Ag: 0.0-0.05; Mn: 0.0-0.5; Fe+Si≦0.20; Zn≦0.15; at least one element from among: Ti: 0.01-0.15; Sc: 0.05-0.3; Cr: 0.05-0.3; Hf: 0.05-0.5; other elements ≦0.05 each and ≦0.15 total, remainders aluminum. The invention also relates to the process for producing said product. The products according to the invention are particularly useful in the production of thick aluminum products intended for producing structural elements in the aeronautical industry.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to U.S. Provisional Application 61 / 220,249 filed Jun. 25, 2009 and FR 09 / 03096 filed Jun. 25, 2009, the contents of which are incorporated herein by reference in their entireties.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to aluminum-copper-lithium alloy products, and more specifically, such products and processes for production and use thereof, in particular in the field of aeronautical and aerospace construction. [0004] 2. Description of Related Art [0005] Products, in particular thick rolled, forged or extruded aluminum alloy products, are developed in order to produce, by cutting, surface milling or machining from the solids, high-strength parts intended in particular for the aeronautical industry, the aerospace industry or mechanical construction. [0006] Aluminum alloys comprising lithium are very beneficial in this regard because lithium can reduce the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/057C22C21/14
CPCC22C21/00C22F1/057C22F1/04C22C21/16
Inventor WARNER, TIMOTHYSIGLI, CHRISTOPHEGASQUERES, CEDRICDANIELOU, ARMELLE
Owner CONSTELLIUM ISSOIRE
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