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A high stress corrosion resistance aluminum-copper-lithium alloy material

A lithium alloy, high stress technology, applied in the field of new materials and aerospace alloys, can solve the problems of reducing, restricting development, application and promotion, and achieve the effect of reasonable ratio and increased strength

Active Publication Date: 2022-03-25
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2297-T8 aluminum-copper-lithium alloy thick plate has better stress corrosion resistance than many traditional aluminum alloys due to the reduction of lithium content, but it still cannot meet the growing needs of aerospace, so it greatly limits its use in my country. Development, application and promotion in the field of aerospace

Method used

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  • A high stress corrosion resistance aluminum-copper-lithium alloy material
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  • A high stress corrosion resistance aluminum-copper-lithium alloy material

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preparation example Construction

[0055] Its preparation method comprises the following steps:

[0056] Ingredients: ingredients are made according to the composition of the aluminum alloy wire material;

[0057] Melting the prepared materials, casting them into molds and cooling to obtain ingots;

[0058] The ingot is cold-rolled into a plate, and after the cold rolling, the material is pre-stretched, annealed, solutionized, and aging heat treated to obtain a high-stress corrosion-resistant aluminum-copper-lithium alloy material; wherein,

[0059] The annealing procedures are sequentially 480-500°C / 10-12min, 360-380°C / 60-70min, 160-180°C / 100-120min and 300-320°C / 60-80min.

[0060] In some examples, the solid solution treatment is carried out at 530-550° C. for 60-80 minutes.

[0061] In some examples, the aging treatment is at 170-175° C. for 30-32 hours.

[0062] In some examples, the content ratio of Cu, Li and Zr is M(Cu):M(Li):M(Zr)=(8-11):(3-5):(1-2).

[0063] In some examples, M(Cu):M(Li):M(Zr)=10:5...

Embodiment 1

[0080] 1) Take Cu: 2.8wt.%, Li: 1.4wt.%, Zr: 0.28 wt.%, and the balance is Al according to the weight percentage of the constituent elements;

[0081] 2) The above materials are smelted at a high temperature in a smelting furnace at a temperature of 750°C until they are melted, then the alloy melt is poured into a mold and stirred, and cooled to obtain an ingot;

[0082] 3) The ingot is cold rolled from 6.5mm to 3.0mm, and the plate is pre-stretched after cold rolling, and the deformation is 4.5%;

[0083] 4) Annealing treatment (480°C / 10min)+(360°C / 65min)+(160°C / 100min+300°C / 60min), followed by solid solution 530°C / 60min and artificial peak aging treatment 170°C / 30h .

Embodiment 2

[0085] 1) Take Cu: 2.83wt.%, Li: 1.45wt.%, Zr: 0.30 wt.%, and the balance is Al according to the weight percentage of the constituent elements;

[0086] 2) The above materials are smelted at a high temperature in a smelting furnace at a temperature of 755°C until they are melted, then the alloy melt is poured into a mold and stirred, and cooled to obtain an ingot;

[0087] 3) The ingot is cold rolled from 6.5mm to 3.5mm, and the plate is pre-stretched after cold rolling, and the deformation is 10.0%;

[0088] 4) Annealing treatment (490°C / 11min)+(380°C / 70min)+(170°C / 110min+310°C / 60min), followed by solid solution 550°C / 60min and artificial peak aging treatment 175°C / 31h .

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Abstract

The invention discloses an aluminum-copper-lithium alloy material with high stress corrosion resistance. The present invention designs a reasonable Al-Cu-Li-Zr element composition, combined with the optimized deformation and heat treatment process, the stress corrosion sensitivity factor of the prepared aluminum-copper-lithium alloy can reach 8.9%-13.1%, and the tensile strength can reach 372- 410MPa, suitable for Al-Cu-Li-Zr alloy materials that require high stress corrosion resistance and mechanical properties, such as Al-Cu-Li-Zr alloy materials for aerospace vehicles.

Description

technical field [0001] The invention relates to a new material, in particular to an alloy for aerospace, in particular to an aluminum-copper-lithium alloy material with high stress corrosion resistance. Background technique [0002] Aluminum-copper-lithium alloys are widely used in the aerospace industry due to their high specific strength, specific stiffness and greater weight reduction effect [1,2] For example, 2196 aluminum-copper-lithium alloy is used in A380 airliner; 2099 and 2199 aluminum-copper-lithium alloy are used in Boeing787 Dreamliner; domestic C919 large commercial airliner, the fuselage section is also made of aluminum-copper-lithium alloy [3] . However, lithium is a very active chemical element, which can spontaneously ignite when exposed to air. Therefore, the corrosion performance of aluminum-lithium alloy structural parts added with lithium has attracted much attention. [0003] The unpredictable cracking or fracture phenomenon of metal in a specific co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/12B21C37/02C22C1/02C22F1/057
CPCC22C21/12C22C1/026B21C37/02C22F1/057
Inventor 张嘉艺齐亮邓同生
Owner JIANGXI UNIV OF SCI & TECH
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