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A kind of high-strength damage-resistant aluminum-lithium alloy and its preparation method and application

An aluminum-lithium alloy and damage-resistant technology, applied in the field of high-strength damage-resistant aluminum-lithium alloy and its preparation, can solve the problems of high density, low density, low yield strength, etc., and achieve low density, high room temperature strength, low fatigue crack The effect of the expansion rate

Active Publication Date: 2022-07-08
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although 1420 Al-Li alloy has a low density (density 2.52g / cm 3 ) and good welding performance, but its yield strength is lower than 400MPa
Although the yield strength of 2060 aluminum-lithium alloy can reach more than 420MPa, its density is greater than 2.71g / cm 3 , at R=0.1, ΔK=30MPa·m 1 / 2 When the fatigue crack growth rate da / dN is greater than 1.8×10 - 3 mm / cycle

Method used

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  • A kind of high-strength damage-resistant aluminum-lithium alloy and its preparation method and application

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preparation example Construction

[0040] In some embodiments, a method for preparing a high-strength, damage-resistant aluminum-lithium alloy sheet includes the following steps: smelting and casting into an ingot according to the designed ratio of aluminum-lithium alloy elements, and then annealing the ingot, hot rolling, Intermediate annealing, cold rolling into sheets, and then through solution quenching, pre-deformation, and aging treatment to obtain the final sheet.

[0041] Preferably, the cast aluminum-lithium alloy ingot is subjected to three-stage annealing treatment, and the annealing process is (300~400)°C×(2~8)h+(400~460)°C×(2~10)h+(480~500 )℃×(20~30)h. More preferably, the annealing process is (350~380)°C×(3~5)h+(430~450)°C×(4~6)h+(490~500)°C×(20~24)h. The purpose of the three-stage annealing with successively increasing temperatures is to gradually dissolve the non-equilibrium solidified phases of different melting points in the ingot during the heating process, thereby reducing the occurrence of...

Embodiment 1

[0049] The composition of the alloy and its weight percentage are 3.5%Cu-1.2%Li-0.5%Mg-0.3%Ag-0.1%Zn-0.1%Zr-0.3%Mn, the total amount of Cu and Li is 4.7%, the mass of Cu and Li The ratio is 2.9, the impurities are Fe 0.08%, Si 0.08%, and the balance is Al. The raw materials are added in the form of pure aluminum, pure lithium, pure magnesium, pure silver, pure zinc, Al-10Mn, Al-4Zr alloy, Al-50Cu alloy, etc. Alloy smelting is carried out in a vacuum melting furnace for melting and casting. The ingot undergoes three-stage annealing at 300℃×8h+450℃×4h+480℃×30h. The surface of the annealed ingot is machined into a slab. The slab is kept at 430°C for 4 hours, and after hot rolling (the deformation does not exceed 30%), it is placed in a 430°C furnace for 1 hour, and the hot rolling is continued. Annealed at ℃ for 5h, and then cold rolled into a 2mm sheet. The thin plate was solid-dissolved at 530°C for 2 hours, water quenched to room temperature, pre-deformed by 3%, and then a...

Embodiment 2

[0051] The composition of the alloy and its weight percentage are 3.9%Cu-1.1%Li-0.76%Mg-0.3%Ag-0.34%Zn-0.1%Zr-0.27%Mn, the total amount of Cu and Li is 5.0%, the mass of Cu and Li The ratio is 3.5, the impurities are Fe 0.05%, Si 0.05%, and the balance is Al. The raw materials are added in the form of pure aluminum, pure lithium, pure magnesium, pure silver, pure zinc, Al-10Mn, Al-4Zr alloy, Al-50Cu alloy, etc. Alloy smelting is carried out in a vacuum melting furnace for melting and casting. The ingot undergoes three-stage annealing at 350℃×5h+430℃×6h+500℃×24h. The surface of the annealed ingot is machined into a slab. The slab is kept at 450°C for 5h, and after hot rolling (deformation does not exceed 30%), it is placed in a furnace at 450°C for 1h, and hot rolling is continued. The hot-rolled sheet was annealed at 400°C for 3h, and then cold-rolled into a 2mm sheet. The thin plate was solid-dissolved at 510°C for 3 hours, quenched with water to room temperature, pre-def...

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Abstract

The invention discloses a high-strength damage-resistant aluminum-lithium alloy and a preparation method and application thereof, comprising the following steps: obtaining raw materials containing the following elements in mass percentage: Li: 0.7-1.2%, Cu: 3.5-3.5% 4.0%, Zn: 0.1-0.5%, Mg: 0.5-1.0%, Ag: 0.2-0.5%, Mn: 0.1-0.3%, Zr: 0.1-0.2%, Fe≤0.08%, Si≤0.08%, balance It is Al, in which the total amount of Cu and Li is 4.0-5.5%, and the mass ratio of Cu and Li is 2.9-5.0; , and then go through solution quenching, pre-deformation and aging treatment to obtain the high-strength damage-resistant aluminum-lithium alloy. The aluminum-lithium alloy and its thin plate prepared by the invention have comprehensive mechanical properties such as low density, high room temperature strength, low fatigue crack growth rate, and resistance to exfoliation corrosion.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy material preparation and processing, and particularly relates to a high-strength damage-resistant aluminum-lithium alloy and a preparation method and application thereof. Background technique [0002] Advanced light metal materials with high specific strength, high specific stiffness and low fatigue crack growth rate are one of the main measures to reduce the weight of aircraft structures and reduce the structural weight coefficient. Experience shows that reducing the material density by 10% can generally reduce the weight of the aircraft structure by 10%; while increasing the mechanical properties of the material (such as strength) by 10% can only achieve a structural weight reduction of about 1% to 3%. Therefore, the development of light alloy materials with high specific strength, high specific stiffness and low fatigue crack growth rate is the most effective method to reduce the structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C21/14C22C21/16C22C21/18C22F1/057B21C37/02
CPCC22C1/026C22C21/14C22C21/16C22C21/18C22F1/057B21C37/02Y02E60/10
Inventor 肖代红刘文胜吴名冬黄兰萍
Owner CENT SOUTH UNIV
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