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A kind of preparation method of 5a90 aluminum-lithium alloy ultra-fine grain plate material

An aluminum-lithium alloy and ultra-fine-grained technology, which is applied in the field of preparation of 5A90 aluminum-lithium alloy ultra-fine-grained plates, can solve problems such as difficulty in deformation, inability to realize industrialized superplastic fine-grained plate preparation, and poor plasticity of the alloy, and achieve improved The effect of atomic diffusion rate, reduction of energy consumption and production cost, and shortening of process flow

Active Publication Date: 2022-03-08
郑州轻研合金科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of Li and Mg in the 5A90 aluminum-lithium alloy, the alloy has poor plasticity and is difficult to deform. The preparation of industrialized superplastic fine-grained plates cannot be achieved by ordinary deformation heat treatment methods.

Method used

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  • A kind of preparation method of 5a90 aluminum-lithium alloy ultra-fine grain plate material
  • A kind of preparation method of 5a90 aluminum-lithium alloy ultra-fine grain plate material
  • A kind of preparation method of 5a90 aluminum-lithium alloy ultra-fine grain plate material

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Embodiment 1

[0041] A preparation method of a 5A90 aluminum-lithium alloy ultra-fine-grained plate, the specific steps are as follows:

[0042] (1) Forging: The 5A90 aluminum-lithium alloy ingot is kept at 460°C for 7 hours and then forged at the same temperature to obtain an aluminum-lithium alloy plate-shaped forging with a thickness of 140mm (such as figure 1 shown);

[0043] (2) Hot rolling: Mill the aluminum-lithium alloy plate-shaped forging obtained in step (1), and then heat it at 460°C for 5 hours, then hot-roll it at the same temperature. Tempering is carried out when the thickness is 80mm, 50mm, and 25mm, each tempering time is 1.5h, the tempering temperature is 450°C, the deformation of a single tempering pass is 15%, and finally rolled to a thickness of 10mm;

[0044] (3) Solution heat treatment: The 10mm-thick plate obtained in step (2) is subjected to solution heat treatment, the solution temperature is 455°C, the time is 70min, and water quenching is performed at 45°C;

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Embodiment 2

[0054] A preparation method of a 5A90 aluminum-lithium alloy ultra-fine-grained plate, the specific steps are as follows:

[0055] (1) Forging: The 5A90 aluminum-lithium alloy ingot was kept at 460°C for 7 hours and then forged at the same temperature to obtain an aluminum-lithium alloy plate-shaped forging with a thickness of 140mm;

[0056] (2) Hot rolling: Mill the aluminum-lithium alloy plate-shaped forging obtained in step (1), and then heat it at 460°C for 5 hours, then hot-roll it at the same temperature. Tempering is carried out when the thickness is 80mm, 50mm, and 25mm, each tempering time is 1.5h, the tempering temperature is 450°C, the deformation of a single tempering pass is 15%, and finally rolled to a thickness of 10mm;

[0057] (3) Solution heat treatment: The 10mm-thick plate obtained in step (2) is subjected to solution heat treatment, the solution temperature is 460°C, the time is 90min, and water quenching is performed at 45°C;

[0058] (4) Pre-aging heat...

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Abstract

The invention belongs to the technical field of thermal processing of nonferrous metal materials, and in particular relates to a preparation method of a 5A90 aluminum-lithium alloy ultrafine-grain plate. The present invention adopts the method of combining forging, hot rolling, solution heat treatment, pre-aging heat treatment, overaging heat treatment, isothermal rolling, static recrystallization annealing and other processes to prepare 5A90 aluminum-lithium alloy ultrafine-grained plate, in order to apply it to For the industrial processing and manufacturing of various spacecraft and various military and civil aircraft, the method of the invention combines isothermal rolling with a two-stage aging process, which is beneficial to shortening the process flow, reducing energy consumption and production costs. It is of great significance to the production of 5A90 aluminum-lithium alloy ultrafine crystal plate.

Description

technical field [0001] The invention belongs to the technical field of thermal processing of nonferrous metal materials, and in particular relates to a preparation method of a 5A90 aluminum-lithium alloy ultrafine-grain plate. Background technique [0002] 5A90 aluminum-lithium alloy, as a lightweight, high-strength metal structural material, has the advantages of low density, high strength, corrosion resistance, and easy molding. For every 1% lithium added to the alloy, the density decreased by 3% and the modulus of elasticity increased by 6%. The use of aluminum-lithium alloys instead of conventional high-strength aluminum alloys can reduce the weight of the structure by 5% to 15%, and increase the stiffness by 15% to 20%. It has very broad application prospects in the fields of aviation and aerospace. [0003] The use of 5A90 Al-Li alloy ultra-fine-grained plates combined with high-temperature creep forming technology (superplastic forming) to prepare Al-Li alloy thin-wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/047C22C21/06C21D8/02C21D1/78
CPCC22F1/047C22C21/06C21D8/0226C21D8/0263C21D8/0273C21D1/78
Inventor 马凯杰肖阳张承志刘志鹏刘振杰祁登科王松森王飞超
Owner 郑州轻研合金科技有限公司
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