Preparation method of aluminum-lithium alloy super-plastic fine-grain plate

Abstract

The invention discloses a preparation method of an aluminum-lithium alloy super-plastic fine-grain plate. The preparation method comprises the following steps that a plate blank with improved processplasticity is put into rolling equipment, high-temperature rolling deformation is carried out, a hot-rolled plate is formed; the hot-rolled plate is taken out from the rolling equipment, solid solution quenching treatment is carried out; the hot-rolled plate which is subjected to solution quenching treatment again is put into the rolling equipment, room-temperature rolling deformation is carried out, the plate is formed; the plate rolled at the room temperature is taken out from the rolling equipment, overaging treatment is carried out; the aluminum-lithium alloy plate after overaging treatment is put into the rolling equipment, low-temperature rolling is carried out; and the plate obtained after low-temperature rolling is taken out from the rolling equipment, recrystallization annealing treatment is carried out, then air cooling is carried out, and the aluminum-lithium alloy super-plastic fine-grain plate is prepared. According to the preparation method of the aluminum-lithium alloy super-plastic fine-grain plate, the process plasticity of the aluminum-lithium alloy plate blank is improved through cogging in a forging and pressing mode, and then the aluminum-lithium alloy super-plastic fine-grain plate which is small in grain size (6 to 10 mum) and uniform in size distribution is prepared through the processes of high-temperature rolling, solid solution quenching, room-temperature rolling, overaging treatment, low-temperature rolling, recrystallization annealing and the like.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy thermal processing, in particular to a preparation method of an aluminum-lithium alloy superplastic fine-grained plate. Background technique [0002] As a new type of aluminum-lithium alloy, the third-generation aluminum-lithium alloy not only has the properties of traditional aluminum-lithium alloys such as low density and high elastic modulus, but also has ultra-high strength, excellent malleability, weldability, etc. It has broad application prospects in the aerospace industry. Superplastic forming technology has good forming accuracy and is a low-cost, high-efficiency special forming method. Applying superplastic forming technology to the overall precise forming of aluminum-lithium alloy complex components can further reduce weight, improve overall rigidity, and reduce assembly. Time and difficulty are of great significance to expand the application fields of aluminum-lithium alloys, i...

AI Technical Summary

Problems solved by technology

When the initial rolling temperature is low, rolling cracking is easy to occur. Although the rolling cracking problem can be improved by increasing the starting rolling temperature and adding the intermediate annealing process, the alloy will undergo obvious partial recrystallization, and the dislocation density will be greatly reduced. Annealing and recrystallization grains are relatively coarse, and the effect of grain refinement is reduced

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