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Preparation method for Al-Cu-Li series aluminum-lithium alloy plate

A technology of al-cu-li and aluminum-lithium alloy, which is applied in the field of preparation of Al-Cu-Li series aluminum-lithium alloy sheet, can solve the problem that the size target and performance uniformity are difficult to achieve synergistically, so as to avoid the uneven structure of the sheet area The effect of uniformity problem, reduction of performance loss, and improvement of heating efficiency

Active Publication Date: 2019-10-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This also makes it difficult to achieve dimensional targets and performance uniformity in the industrial production of Al-Cu-Li aluminum-lithium alloy sheets.

Method used

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  • Preparation method for Al-Cu-Li series aluminum-lithium alloy plate
  • Preparation method for Al-Cu-Li series aluminum-lithium alloy plate
  • Preparation method for Al-Cu-Li series aluminum-lithium alloy plate

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Experimental program
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Effect test

Embodiment 1

[0031] The aluminum-lithium alloy ingot is first heated to 120°C and held for 12 hours, then heated to 370°C and held for 10 hours, then heated to 420°C and held for 8 hours, and finally heated to 510°C and held for 18 hours, then the head and tail are sawed and milled. After the hot-rolled billet is preheated to 510°C, it is rolled into a plate with a thickness of 25mm. The surface temperature of the plate during the rolling process is not lower than 330°C. After solution and quenching treatment at 510°C / 3h, pre-stretch deformation with a deformation amount of 2%, and finally artificial aging treatment at 160°C / 24h, the final aluminum-lithium alloy plate is obtained.

Embodiment 2

[0033] The aluminum-lithium alloy ingot is first heated to 120°C and held for 12 hours, then heated to 350°C and held for 10 hours, then heated to 450°C and held for 8 hours, finally heated to 510°C and held for 18 hours, and then sawed and milled. After the hot-rolled billet is preheated to 510°C, it is rolled into a plate with a thickness of 25mm. The surface temperature of the plate during the rolling process is not lower than 330°C. Perform solid solution at 510°C / 3h, immediately water quench to room temperature, perform pre-stretch deformation with 2% deformation, and finally obtain the final aluminum-lithium alloy plate after artificial aging treatment at 160°C / 24h.

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Abstract

The invention discloses a preparation method for an Al-Cu-Li series aluminum-lithium alloy plate. The preparation method comprises the steps that an aluminum-lithium alloy ingot is firstly subjected to heat preservation at 95 DEG C-121 DEG C for 6 h-24 h, is heated to 320 DEG C-400 DEG C for heat preservation for 3 h-16 h, then is heated to 420 DEG C-450 DEG C for heat preservation for 4 h-12 h and is finally heated to 480 DEG C-510 DEG C for heat preservation for 8 h-24 h so that homogenization treatment can be carried out; then the head and the tail are sawed, face milling is carried out, ahot rolled billet is machined, preheating is carried out to 480 DEG C-520 DEG C, rolling is carried out to form the plate with the thickness being 0.8 mm-25 mm, the surface temperature of the plate inthe rolling process is not lower than 330 DEG C, and the gate pressing rate in the rolling process is 10%-30%; and the rolled plate is subjected to heat preservation at 505 DEG C-525 DEG C for 2 h-6h for solid solution and quenching treatment, pre-stretching deformation with the deformation amount being 1%-5% is carried out, and finally artificial aging treatment is carried out to the T8 state.The preparation method can effectively eliminate a coarse-grain layer on the surface layer of the aluminum-lithium alloy plate, the performance loss in the preparation process of the plate is controlled, and the uniformity of the performance of the plate is improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy material processing, and in particular relates to a preparation method of an Al-Cu-Li series aluminum-lithium alloy plate. Background technique [0002] Lithium is the lightest metal on earth. Aluminum alloys can obtain excellent properties such as high specific strength and specific stiffness after adding lithium. At present, the development of aluminum-lithium alloy has formed the third generation of aluminum-lithium alloy with Al-Cu-Li as the main alloy system, which has the remarkable characteristics of low density, high modulus and high strength, and also has good corrosion resistance and high / low temperature performance. In the context of long-term structural weight reduction requirements in the aerospace manufacturing field, the application of Al-Cu-Li aluminum-lithium alloys can bring considerable benefits. [0003] There are many types of second phases in Al-Cu-Li aluminum-lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057C22C21/16
CPCC22C21/16C22F1/002C22F1/057
Inventor 张劲汪成雷郴祁叶凌英易幼平黄始全李智德蒋震
Owner CENT SOUTH UNIV
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