High-temperature annealing method of Al-Li-Cu-X serial aluminum lithium alloy

Abstract

The invention discloses a high-temperature annealing method of an Al-Li-Cu-X serial aluminum lithium alloy. The Al-Li-Cu-X serial aluminum lithium alloy comprises the following chemical components in percentage by weight: 2.0-5.0% of Cu, 0.8-2.5% of Li, 0.20-0.60% of Mn, 0.20-0.80% of Zn, 0.04-0.20% of Zr, 0.20-0.80% of Mg, 0.1-0.7% of Ag, less than or equal to 0.10% of Si, less than or equal to 0.10% of Fe, less than or equal to 0.12% of Ti, less than or equal to 0.05% of each of other impurities, less than or equal to 0.15% of total amount of other impurities, and the balance of Al. The high-temperature annealing method is characterized by comprising the following steps of: (1) carrying out fusion casting and homogenization according to fusion casting and homogenization processes of 2A97 aluminum lithium alloy; (2) carrying out hot rolling or cold rolling according to a hot rolling or cold rolling process of 2A97 aluminum lithium alloy; (3) carrying out high-temperature annealing process, namely, heating a workpiece to 360-500 DEG C, keeping the temperature for 2h and cooling down, wherein the cooling speed is not greater than 20 DEG C/h, and the workpiece is discharged out of the furnace and cooled with air when the furnace temperature is not higher than the 200 DEG C. Compared with the conventional low-temperature annealing process, the method provided by the invention can ensure that the material has low strength and high toughness, so as to ensure that the material has excellent process properties.

Description

technical field [0001] The invention relates to a high-temperature annealing method for an Al-Li-Cu-X series aluminum-lithium alloy, which belongs to the field of metal material engineering. Background technique [0002] Modern mechanical design pays more attention to low energy consumption and high life. In order to meet the needs of aircraft and ships and other transportation machinery for long endurance, high life and economy, there are more and more demands for high specific strength and high specific mold materials. Aluminum-lithium alloys Material is an important material with obvious structural weight reduction effect among metal materials. The annealing process of the traditional aluminum-lithium alloy is low-temperature annealing, which cannot eliminate residual stress. It is suitable for sheet rolling, and the production efficiency is low. In addition, when it is used to produce complex-shaped parts in aerospace and other fields, it is difficult to form due to the ...

AI Technical Summary

Problems solved by technology

The annealing process of the traditional aluminum-lithium alloy is low-temperature annealing, which cannot eliminate residual stress. It is suitable for sheet rolling, and the production efficiency is low. In addition, when it is used to produce complex-shaped parts in aerospace and other fields, it is difficult to form due to the lack of toughness of the alloy material.

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