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Heat treatment method for improving damage resistance of aluminum lithium alloy thin plate

A heat treatment method and aluminum-lithium alloy technology, applied in the field of heat treatment of aluminum alloy thin plates, can solve problems such as unfavorable damage resistance and influence on the size uniformity of wide-width plates, so as to improve production efficiency and yield, good damage resistance, and improve The effect of damage resistance

Active Publication Date: 2016-07-13
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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AI Technical Summary

Problems solved by technology

A small amount of cold deformation before solid solution can ensure damage resistance but will affect the dimensional uniformity of the wide sheet, while a large cold deformation can obtain better dimensional uniformity, but will form fine recrystallization during solid solution tissue, detrimental to damage resistance

Method used

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  • Heat treatment method for improving damage resistance of aluminum lithium alloy thin plate
  • Heat treatment method for improving damage resistance of aluminum lithium alloy thin plate

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Embodiment

[0017] Using the Al-Cu-Li-X aluminum-lithium alloy heat treatment method involved in the present invention, the cold-rolled sheets of three specifications of 2.0, 1.5mm and 1.2mm were respectively annealed + solid solution + aging treatment, and the plates were treated to T3 State, the cold rolling deformation of the plate before solid solution is 35% and 60%, respectively, the tensile properties and da / dN properties of the plate are measured, and compared with the T3 state properties of the traditional solution process, the specific properties are shown in Table 1 shown.

[0018] Table 1 The performance corresponding to 24 embodiments of the present invention and plates of different thicknesses

[0019]

[0020]

[0021] Based on the data in Table 1, it fully demonstrates that the heat treatment method for aluminum-lithium alloy sheet proposed by the present invention can improve the damage resistance of the alloy under the premise that other properties remain unchanged...

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Abstract

The invention relates to a heat treatment method for improving damage resistance of an Al-Cu-Li-X series aluminum lithium alloy thin plate. The alloy thin plate comprises: by weight, 2.0-5.0% of Cu; 0.8-2.5% of Li; any one to five of 0.20-0.60% of Mn, 0.20-0.80% of Zn, 0.04-0.20% of Zr, 0.20-0.80% of Mg and 0.1-0.7% of Ag; 0.10% or less of Si; 0.10% or less of Fe; 0.12% or less of Ti; 0.15% or less of other impurities with the respective content of 0.05% or less; and the balance of Al. The method comprises the following steps: carrying out cold finish rolling on the alloy thin plate to form a thin plate with a final thickness, carrying out short-time annealing treatment at a certain temperature, carrying out solid solution quenching, and carrying out subsequent aging treatment to reach a required state. The method can regulate the microstructure and performances of the plate to make the damage resistance of the plate be greatly improved without changing other performances.

Description

technical field [0001] The invention belongs to the heat treatment technology of aluminum alloy sheets, and relates to a novel heat treatment method for improving the damage resistance of Al-Cu-Li-X series aluminum-lithium alloy sheets. Background technique [0002] Al-Cu-Li-X series aluminum-lithium alloy has high specific strength, high specific stiffness, high toughness and excellent damage resistance, and its thin plate is suitable for manufacturing aircraft skins. Due to the high requirements on the width, size uniformity, surface quality and damage resistance of the panels required for the fuselage skin, at present, limited by the domestic equipment and technical level, in the Al-Cu-Li-X series wide How to achieve coordinated control of size uniformity and damage resistance in the preparation process of thin plates has become a difficult problem. A small amount of cold deformation before solid solution can ensure damage resistance but will affect the dimensional unifo...

Claims

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Application Information

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IPC IPC(8): C22F1/057C22C21/18
Inventor 李国爱陆政冯朝辉何维维郝敏
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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