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Preparation method of Al-Cu-Li-X series aluminum lithium alloy sheet

An al-cu-li-x, aluminum-lithium alloy technology, which is applied in the field of aluminum-lithium alloy sheet preparation technology, can solve the problems of sheet dimensional accuracy, the surface quality of the sheet cannot meet the requirements of use, etc., and achieves forming performance and damage tolerance. The effect of improved performance, high dimensional accuracy, high efficiency

Active Publication Date: 2014-01-29
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Application Information

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Problems solved by technology

At present, aluminum-lithium alloy sheets are mostly prepared by sheet rolling abroad, but in China, due to the lack of high-precision sheet rolling mills and single sheet pre-stretching machines, the dimensional accuracy of sheets prepared by sheet rolling methods, The plate shape and surface quality are difficult to meet the requirements of use

Method used

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  • Preparation method of Al-Cu-Li-X series aluminum lithium alloy sheet
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  • Preparation method of Al-Cu-Li-X series aluminum lithium alloy sheet

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Embodiment

[0026] To produce qualified Al-Cu-Li-X series aluminum-lithium alloy ingots, the chemical composition and weight percentage of the alloy are: Cu2.0~3.0%, Li1.8~2.6%. Zr0.04~0.20%, Mg0.20%~1.20%, Ag0.1~0.9%, Si≤0.10%, Fe≤0.10%, Ti≤0.12%, other impurities individually≤0.05%, total ≤0.15%, The balance is Al, see attached figure 1 As shown, the process of using this alloy to process thin plates is as follows:

[0027] ⑴Hot rolling, hot-rolling the homogenized slabs at a temperature of 480~500℃;

[0028] ⑵Hot finish rolling, hot finish rolling the hot-rolled plate to a thickness of 4.0mm~8.0mm, the hot finish rolling temperature is 280℃~380℃, and then coiled into coils for preparation before cold rolling;

[0029] ⑶ High temperature annealing treatment for the hot finish rolling plate, the annealing temperature is 421℃~490℃, the holding time is 0.5~4.0h, after the furnace is cooled to about 200℃, take out air cooling, and the cooling rate with the furnace is less than 28℃ / h;

[0030] ⑷ C...

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Abstract

The invention discloses a preparation method of an Al-Cu-Li-X series aluminum lithium alloy sheet. The sheet prepared by the method is 0.8mm-8.0mm in thickness. The method comprises the following steps: cogging and hot-rolling homogenized slab ingots to a specified thickness and coiling; carrying out annealing treatment, uncoiling and carrying out band-type cold-rolling; carrying out intermediate annealing according to deformation during cold-rolling, thus obtaining the sheets with uniform thicknesses. The sheets can be in different states after being subjected to solution treatment, prestretching and aging treatment, so as to meet different usage requirements. Compared with the prior art, the aluminum lithium alloy sheet with high surface quality, uniform sheet size and smooth sheet shape is prepared by the method through band-type cold-rolling. The sheets can be in different states by different heat-treating processes, so as to meet usage requirements under different application conditions.

Description

Technical field [0001] The invention is a method for preparing Al-Cu-Li-X series aluminum-lithium alloy thin plates, and belongs to the preparation process of aluminum-lithium alloy thin plates. Background technique [0002] The Al-Cu-Li-X series aluminum-lithium alloy has high specific strength, high specific stiffness, high toughness and excellent damage resistance. Its thin plate is suitable for manufacturing aircraft skins. At present, the sheet rolling method is mostly used for the preparation of aluminum-lithium alloy thin plates in foreign countries. However, in China, due to the lack of high-precision sheet rolling mills and single sheet pre-stretching machines, the dimensional accuracy of the thin plates prepared by the sheet rolling method is, The board shape and surface quality are difficult to meet the requirements of use. Summary of the invention [0003] The present invention is designed to provide a method for preparing Al-Cu-Li-X aluminum-lithium alloy thin plates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22C21/00
Inventor 冯朝辉李国爱陆政何维维张坤
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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