Method for preparing aluminum lithium alloy superplastic plate

An aluminum-lithium alloy and superplastic technology, which is applied in the field of preparing aluminum-lithium alloy superplastic sheets, can solve the problems of slow roll gap adjustment of large rolling mills, increased tendency of sheet cracking, short residence time, etc. The effect of equipment production, increasing the number of intermediate annealing, and increasing the intermediate annealing temperature

Active Publication Date: 2014-06-25
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) The existing process requires a short residence time between rolling passes, otherwise the plate is easy to crack during rolling, and it is only suitable for preparing small-sized samples on small-scale rolling in the laboratory
For example, when preparing 2A97 aluminum-lithium alloy superplastic plates under industrial equipment conditions, after preheating at 400°C for 1 hour, when rolling from 25 mm thick to 10 mm thick, when the rolling deformation is only 60%, the plate will appear serious. cracking, such as figure 1 As shown, it is impossible to continue rolling
This is

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  • Method for preparing aluminum lithium alloy superplastic plate
  • Method for preparing aluminum lithium alloy superplastic plate
  • Method for preparing aluminum lithium alloy superplastic plate

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Embodiment 1

[0032] The method for preparing an aluminum-lithium alloy superplastic plate comprises the following steps:

[0033] (1) Solid solution the 2A97 aluminum-lithium alloy slab at 520°C for 4 hours, and water-quench and cool at room temperature (15-35°C);

[0034] (2) Heat the 2A97 aluminum-lithium alloy slab after solid solution at 400°C for 48 hours, and perform overaging treatment;

[0035] (3) Rolling the aged 2A97 aluminum-lithium alloy slab to 1.8 mm;

[0036] The rolling in step (3) is to preheat the 2A97 aluminum-lithium alloy slab at 400°C for 1 hour and then roll it to a thickness of 15mm, then carry out a process of 400°C, 1 hour of intermediate annealing, and then continue rolling to a thickness of 6.8mm , and then carry out the process of 380-400 ° C, 1h of intermediate annealing and rolling to a thickness of 2.5mm (this time a turning rolling is carried out, that is, the rolling is carried out along the transverse direction before the intermediate annealing), and th...

Embodiment 2

[0039]The method for preparing an aluminum-lithium alloy superplastic plate comprises the following steps:

[0040] 1) Solid solution the 2A97 aluminum-lithium alloy slab at 520°C for 3 hours, and water quench and cool at room temperature (15-35°C);

[0041] (2) Heat the 2A97 aluminum-lithium alloy slab after solid solution at 400°C for 48 hours, and perform overaging treatment;

[0042] (3) Rolling the aged 2A97 aluminum-lithium alloy slab to 2.5 mm;

[0043] The rolling in step (3) is to preheat the 2A97 aluminum-lithium alloy slab at 400°C for 1 hour and then roll it to a thickness of 17mm, and then carry out an intermediate annealing at 400°C for 1 hour and continue rolling to a thickness of 11mm. Then carry out the process of 380-400 ℃, 1h intermediate annealing and rolling to a thickness of 6.6mm, and then carry out 380-400 ℃ / 1h intermediate annealing and continue rolling to 3.3mm to obtain 20-30% shape Variable 2A97 aluminum-lithium alloy plate; after the plate is coo...

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Abstract

The invention discloses a method for preparing an aluminum lithium alloy superplastic plate. The process route of the method comprises the following steps: carrying out solid solution on a raw material, namely a 2A97 aluminum lithium alloy plate blank with certain initial thickness at 460-540 DEG C for 0.5-4 hours, carrying out water quenching, and then carrying out heat preservation at 400 DEG C for 8-48 hours; then rolling an alloy to 1.0-4.0 mm. Compared with the traditional thermomechanical treatment method, the method disclosed by the invention can be used for effectively solving the problem of easiness for cracking of a large-sized plate during rolling by increasing the intermediate annealing temperature, enhancing the deformation stored energy of the alloy and solving the problem of low superplastic elongation percentage of a plate by changing the traditional warm rolling process into a cold rolling process by retaining 20%-30% of deformation amount and can be used for firstly preparing the 2A97 aluminum lithium alloy large-sized superplastic plate with good superplastic property.

Description

technical field [0001] The invention belongs to the field of nonferrous metal material processing, and in particular relates to a method for preparing aluminum-lithium alloy superplastic plates. [0002] By adopting the method of the invention, the 2A97 aluminum-lithium alloy superplastic plate can be obtained, and the typical superplastic elongation rate is 560%-1070%. Background technique [0003] In the aerospace industry, reducing weight and increasing efficiency is an eternal theme. Every gram of weight reduction in the aircraft will produce considerable technical and economic benefits. 2A97 aluminum-lithium alloy is a new type of Al-Cu-Li alloy independently developed by my country. It belongs to the third generation of aluminum-lithium alloy and is an important lightweight structural material in the aerospace field. The modern aerospace industry requires lightweight, low-cost, and high-volume components. Applying superplastic technology to aluminum-lithium alloys c...

Claims

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Application Information

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IPC IPC(8): C22F1/04
Inventor 叶凌英邓运来张艳苓刘丽谢磊候红亮张新明
Owner CENT SOUTH UNIV
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