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High-strength damage-resistant aluminum-lithium alloy and preparation method and application thereof

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 low yield strength, low density, high density, etc., and achieve high room temperature strength, low density, low fatigue crack The effect of the expansion rate

Active Publication Date: 2021-08-06
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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  • High-strength damage-resistant aluminum-lithium alloy and preparation method and application thereof

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preparation example Construction

[0040] In some embodiments, the method for preparing a high-strength and damage-resistant aluminum-lithium alloy sheet includes the following steps: melting 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 plates, and then solution quenching, pre-deformation, and aging treatment to obtain the final thin plates.

[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 )°C×(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 three-stage annealing with increasing temperature in sequence is to gradually dissolve non-equilibrium solidified phases with different melting points in the ingot during the heating process, thereby reducing the occurrence of over...

Embodiment 1

[0049] The composition and weight percentage of the alloy 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 Ratio 2.9, impurity Fe 0.08%, Si 0.08%, balance Al. 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 melting is melted and casted in a vacuum melting furnace. The ingot was annealed in three stages at 300°C×8h+450°C×4h+480°C×30h. The surface of the annealed ingot is machined to the slab. The slab is kept at 430°C for 4 hours, after hot rolling (the deformation does not exceed 30%), it is placed in a furnace at 430°C for 1 hour, and hot rolling is continued. After multiple passes of hot rolling, it becomes a 6mm plate. ℃ annealing for 5h, and then cold rolled into a 2mm thin plate. The thin plate is solidified at 530°C for 2h, water quenched to room temperature, pre-deformed by 3%, and then ...

Embodiment 2

[0051] The composition and weight percentage of the alloy 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 Ratio 3.5, impurity Fe 0.05%, Si 0.05%, balance Al. 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 melting is melted and casted in a vacuum melting furnace. The ingot was annealed three-stage at 350°C×5h+430°C×6h+500°C×24h. The surface of the annealed ingot is machined to the slab. The slab is kept at 450°C for 5 hours, after hot rolling (the deformation does not exceed 30%), it is placed in a furnace at 450°C for 1 hour, and hot rolling is continued until it is rolled into a 6mm plate after multiple passes of hot rolling. The hot-rolled sheet was annealed at 400°C for 3h, and then cold-rolled into a 2mm thin sheet. The thin plate was solidified at 510°C for 3h, water quenched to room ...

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Abstract

The invention discloses a high-strength damage-resistant aluminum lithium alloy and a preparation method and application thereof. The preparation method comprises the following steps of obtaining raw materials comprising the following elements in percentage, by mass, 0.7-1.2% of Li, 3.5-4.0% of Cu, 0.1-0.5% of Zn, 0.5-1.0% of Mg, 0.2-0.5% of Ag, 0.1-0.3% of Mn, 0.1-0.2% of Zr, less than or equal to 0.08% of Fe, less than or equal to 0.08% of Si and the balance of Al, the total amount of Cu and Li is 4.0-5.5%, and the mass ratio of Cu to Li is 2.9-5.0; and the high-strength damage-resistant aluminum-lithium alloy is obtained by smelting and casting raw materials into a cast ingot, annealing, hot rolling, intermediate annealing and cold rolling the cast ingot into a plate, and then carrying out solid solution quenching, pre-deformation and aging treatment to obtain the high-strength damage-resistant aluminum-lithium alloy. The prepared aluminum-lithium alloy and the thin plate thereof have the comprehensive mechanical properties of low density, high room temperature strength, low fatigue crack propagation rate, exfoliation corrosion resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation and processing of aluminum alloy materials, and in particular 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 factor. 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 reduce the weight of the structure by 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 way to reduce the structural...

Claims

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Application Information

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Patent Type & Authority Applications(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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