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Ultrahigh-strength aluminum-lithium alloy and preparation method thereof

An aluminum-lithium alloy and ultra-high-strength technology, which is applied in the field of ultra-high-strength aluminum-lithium alloy and its preparation, can solve the problems of not involving elastic modulus, low fracture toughness of the alloy, low zinc content, etc., and achieves superior room temperature tensile strength, excellent Comprehensive properties, the effect of high room temperature tensile strength

Inactive Publication Date: 2019-11-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (Patent No. 201380023370.0) discloses a new 2xxx aluminum-lithium alloy comprising 3.5-4.4wt.% Cu, 0.45-0.75wt.% Mg, 0.45-0.75wt.% Zn, 0.65-1.15wt. %Li, the alloy is an aluminum-lithium alloy with low zinc content, the Zn / Mg mass fraction ratio is between 0.60-1.67, and the alloy requires that the magnesium content is less than 1%, but the fracture toughness of the alloy is low
Chinese patent (patent number 201810444457.X) discloses a high-strength and toughness extruded aluminum-lithium alloy with high Zn content and its preparation method. The components in the alloy are: Zn 4.1-5.5%, Cu 2-4.5%, Mg 2-3%, Li 1-2%, Zr0.1-0.5%, but the magnesium content in the alloy exceeds 2%, which will cause T 1 A large amount of phase precipitates at the grain boundary, which reduces the strength of the grain boundary, thereby reducing the fracture toughness of the alloy
It can meet the current demand, but its highest strength is only 663MPa; and it does not involve the optimization of key parameters such as elastic modulus

Method used

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  • Ultrahigh-strength aluminum-lithium alloy and preparation method thereof
  • Ultrahigh-strength aluminum-lithium alloy and preparation method thereof
  • Ultrahigh-strength aluminum-lithium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] The composition and weight percentage of the alloy are 0.8%Li-4.3%Cu-0.3%Mg-0.1%Zr-0.1%Mn-0.81%Zn-0.1%Ag-0.09Sc, and the mass fraction ratio of Cu / Li is 5.4. The preparation method is as follows: in the atmospheric environment, put pure aluminum, aluminum-copper master alloy, aluminum-zirconium master alloy, pure zinc, pure magnesium, pure silver into the melting furnace to melt, and sprinkle the covering agent on the surface; then pure Lithium is pressed into the above-mentioned molten alloy melt, refined by argon degassing and slag removal, and statically cast to form. The ingot is subjected to multi-stage homogenization annealing treatment. The annealing process is: 400°C for 5 hours, then heated to 450°C for 10 hours, and then heated to 490°C for 24 hours. The annealed samples were extruded into sheets at 430°C with an extrusion ratio of 5. The hot-extruded plate alloy is subjected to solution and quenching treatment by gradually increasing the temperature. The sol...

Embodiment 2

[0036] The composition and weight percentage of the alloy are 1.2%Li-5.2%Cu-0.6%Mg-0.2%Zr-0.2%Mn-0.5%Zn-0.5%Ag-0.1Sc, and the mass fraction ratio of Cu / Li is 4.3. The preparation method is as follows: in the atmospheric environment, put pure aluminum, aluminum-copper master alloy, aluminum-zirconium master alloy, pure zinc, pure magnesium, pure silver into the melting furnace to melt, and sprinkle the covering agent on the surface; then pure Lithium is pressed into the above-mentioned molten alloy melt, refined by argon degassing and slag removal, and statically cast to form. The ingot is subjected to multi-stage homogenization annealing treatment. The annealing process is: 420°C for 1h, then heated to 480°C for 5h, and then heated to 510°C for 12h. The annealed samples were extruded into sheets at 460°C with an extrusion ratio of 20. The hot-extruded plate alloy is subjected to solution and quenching treatment by gradually increasing the temperature. The solution process is:...

Embodiment 3

[0038] The composition and weight percentage of the alloy are 1.0%Li-4.5%Cu-0.7%Mg-0.2%Zr-0.2%Mn-1.5%Zn-0.5%Ag-0.3Sc, and the mass fraction ratio of Cu / Li is 4.5. The preparation method is as follows: under vacuum, put pure aluminum, aluminum-copper master alloy, aluminum-zirconium master alloy, pure zinc, pure magnesium, and pure silver into a melting furnace to melt in sequence, and then stand and cast to shape. The ingot is subjected to multi-stage homogenization annealing treatment. The annealing process is: 380°C for 5h, then heated to 460°C for 7.5h, and then heated to 500°C for 24h. The annealed samples were extruded into sheets at 440°C with an extrusion ratio of 12.5. The hot-extruded plate alloy is subjected to solution and quenching treatment by gradually increasing the temperature. The solution process is: heating to 425°C for 2 hours, then heating to 480°C for 1 hour, and then heating to 530°C for 1 hour. After the solid solution treatment, the water was cooled t...

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Abstract

The invention relates to an ultrahigh-strength aluminum-lithium alloy and a preparation method thereof. The alloy comprises the following components of, by mass, 4.3%-5.2% of Cu, 0.8%-1.2% of Li, 0.3%-0.7% of Mg, 0.1%-0.5% of Ag, 0.81%-1.5% of Zn, 0.1%-0.2% of Mn, 0.1%-0.2% of Zr, 0.09%-0.3% of Sc and the balance Al, wherein the mass percentage ratio of Cu / Li is 4.3 to 6.5. The preparation methodcomprises the following steps that the components are weighed according to the designed aluminum alloy component ratio, atmospheric smelting or vacuum smelting is adopted to cast a molded cast ingot,and then multi-stage homogenization treatment, hot extrusion deformation, step-by-step heating and solid solution, cold rolling deformation and aging treatment are carried out. According to the ultrahigh-strength aluminum-lithium alloy and the preparation method thereof, a product which has the performances more superior than that of an existing aluminum-lithium alloy is prepared, and the producthas the characteristics of being high in yield strength, high in hardness, high in elasticity modulus, capable of being strengthened through heat treatment and the like.

Description

technical field [0001] The invention relates to an ultrahigh-strength aluminum-lithium alloy and a preparation method thereof, belonging to the technical field of metal material preparation. Background technique [0002] Adding 1wt% Li to the aluminum alloy can reduce the density of the alloy by 3%, while the modulus of elasticity can be increased by 6%, and it has a good solid solution strengthening effect. Therefore, aluminum-lithium alloys have the advantages of low density, high specific strength and specific stiffness, fatigue resistance and corrosion resistance. Replacing conventional aluminum alloys with aluminum-lithium alloys can reduce the structural mass by 10% to 15%, and increase the rigidity by 15% to 20%. It is an ideal aerospace structural material. With the development of my country's aerospace industry, new low-density aluminum alloys have been continuously developed, but the existing aluminum-lithium alloy production has problems such as difficulty, high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/18C22C1/03C22C21/16C22F1/057
CPCC22C1/026C22C1/03C22C21/16C22C21/18C22F1/057
Inventor 肖代红刘文胜吴名冬陈炜斌
Owner CENT SOUTH UNIV
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