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Thin sheets made of an aluminium-magnesium-scandium alloy for aerospace applications

An aluminum alloy, aluminum-based technology, applied in the field of forging products

Active Publication Date: 2019-06-04
CONSTELLIUM ISSOIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the product must be obtainable according to a reliable and cost-effective production process that can be easily adapted to conventional production lines

Method used

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  • Thin sheets made of an aluminium-magnesium-scandium alloy for aerospace applications
  • Thin sheets made of an aluminium-magnesium-scandium alloy for aerospace applications
  • Thin sheets made of an aluminium-magnesium-scandium alloy for aerospace applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] A number of slabs with a thickness of 400 mm were cast, the composition of which is shown in Table 1.

[0085]

Si

Fe

Cr

mn

Mg

Zn

Ti

Zr

sc

A

0.02

0.05

＜0.01

0.62

4.05

0.28

0.023

0.10

0.19

B

0.02

0.04

＜0.01

0.59

3.99

0.29

0.038

0.10

0.19

[0086] Table 1 : Composition in % by weight (analyzed by spark source optical emission spectroscopy, S-OES).

[0087] Slabs made of alloy A were homogenized at 445°C for 5 hours, while slabs made of alloy B were homogenized at 515°C for 15 hours. The slabs thus homogenized were directly subjected to hot rolling after homogenization with the hot rolling start temperature of slab A being 415°C and the hot rolling starting temperature of slab B being 480°C to obtain a 4 mm thick plate.

[0088] The static mechanical tensile properties of the plates made of Alloy A remained high both in the hot-rolled condition (LAC) and in the...

Embodiment 2

[0101] This example studies the effect of homogenization conditions before heat deformation on mechanical properties. Blocks made of alloy A with dimensions 250×180×120 mm were hot rolled under different conditions until a thickness of 8 mm or 12 mm was obtained. The conditions are shown in Table 5.

[0102]

[0103] Table 5: Transformation conditions for different blocks made from Alloy A

[0104] Mechanical properties are measured on rolled or treated plates. The results are shown in Table 6.

[0105]

[0106]

[0107] Table 6: Static mechanical properties obtained for different plates in as-rolled condition (LAC) and in annealed condition (4 hours at 325°C).

[0108] The products (CD3, CF1, CF2, CF3) obtained by the method of the invention have favorable mechanical properties, in particular an Rp0.2 in the L direction of at least 260 MPa after LAC and after annealing at 325° C. for 4 hours.

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Abstract

The invention relates to a method for producing a hot-worked product made of an aluminium alloy composed, in wt%, of Mg: 3.8-4.2; Mn: 0.3-0.8 and preferably 0.5-0.7, Sc: 0.1-0.3; Zn: 0.1-0.4; Ti: 0.01-0.05; Zr: 0.07-0.15; Cr: <0.01; Fe: <0.15; and Si: <0.1; wherein the homogenisation is carried out at a temperature of between 370 DEG C and 450 DEG C, for between 2 and 50 hours, such that the equivalent time at 400 DEG C is between 5 and 100 hours, and the hot deformation is carried out at an initial temperature of between 350 DEG C and 450 DEG C. The invention also relates to hot-worked products obtained by the method according to the invention, in particular sheets with a thickness of less than 12 mm. The products according to the invention are advantageous as they offer a better compromise in terms of mechanical strength, toughness and hot-formability.

Description

technical field [0001] This invention relates to a method of preparing wrought products made of aluminum-magnesium alloys, also known as Aluminum Association 5XXX series aluminum alloys, and more particularly to Sexual Al-Mg alloy products containing Sc. The invention also relates to the product obtainable by said method, and to the use of said product for means of transport, in particular aeronautical and space construction. Background technique [0002] Wrought products made of aluminum alloys were developed in particular to prepare structural elements for the transport industry, especially for the aeronautical and space industries. In these industries, product properties must be continuously improved and new alloys developed to provide, inter alia, high mechanical strength, low density, high toughness, excellent corrosion resistance and very good formability. In particular, forming can be performed under heating, for example by creep forming, and the mechanical properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22F1/047
CPCC22C21/06C22F1/047
Inventor B·贝斯J-C·埃斯特罗姆G·普热
Owner CONSTELLIUM ISSOIRE