Preparation method of 2050 aluminium-lithium alloy fine-grain plate

Abstract

The invention discloses a preparation method of a 2050 aluminium-lithium alloy fine-grain plate. The preparation method comprises the steps: firstly carrying out solid solution and water quenching atthe temperature of 450-550 DEG C; then carrying out rolling predeformation under room temperature, wherein the total predeformation amount is 35-55%; then carrying out overaging treatment for 24-60 hours at the temperature of 350-450 DEG C; then after preserving heat for 1-3 hours at the temperature of 150-250 DEG C, carrying out rolling deformation on the plate, wherein the total deformation amount is 80-96% and the pass deformation amount is 10-30%; finally, carrying out recrystallization and annealing in a salt bathing furnace for 1-60 minutes at the temperature of 450-550 DEG C. The preparation method disclosed by the invention has the beneficial effects that rolling predeformation with large deformation amount is adopted, and overaging and intermediate annealing are combined, so that92% low-temperature rolling deformation is realized in aluminium alloy with poor low-temperature plasticity, the deformation energy storage of the alloy is fully preserved, simultaneously the crackingof the plate is effectively inhibited, the grain refinement is realized, and the 2050 alloy plate with the grain size being 8-10mu m and without cracking is prepared.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal materials and thermal processing thereof, and specifically relates to a preparation method of a 2050 aluminum-lithium alloy fine-grained plate. Background technique [0002] 2050 aluminum-lithium alloy is a third-generation aluminum-lithium alloy. As a new type of aluminum-lithium alloy, it not only has low density, high elastic modulus and good fatigue performance of traditional aluminum-lithium alloys, but also has excellent thermal stability and Corrosion resistance, has a wide range of application prospects in the aerospace industry. [0003] The modern aerospace industry requires parts to be integrally formed, which puts forward higher requirements on the formability of materials. Superplastic forming can not only meet the overall forming needs of the aviation industry, but also has unique advantages for the overall forming of complex parts compared to traditional forming methods. To achiev...

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Problems solved by technology

However, the intermediate annealing temperature has a great influence on the final recrystallization grain size: when the temperature is 400 ° C, the alloy undergoes obvious partial recrystallization, and the dislocation density is greatly reduced, although a crack-free plate with 82% deformation is obtained , but the grains after recrystallization are coarse, with an average grain size of about 16 μm

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