Al-Zn-Mg-Cu aluminum alloy deformation-solid solution heat treatment technology

Abstract

The invention relates to an Al-Zn-Mg-Cu aluminum alloy deformation-solid solution heat treatment technology, which comprises the following steps: (1) pre-deformation, wherein the temperature range of pre-deformation is 400 DEG C - 420 DEG C, the deflection amount is 10% - 95%; (2) pre-solid solution, wherein the temperature range of pre-solid solution is 440 DEG C - 480 DEG C, the insulation timeis 30 - 120 minutes; (3) re-deformation, wherein the temperature range of pre-deformation is 400 DEG C - 420 DEG C, the deflection amount is 10% - 95%; (4) solid solution for short time, wherein the temperature range of solid solution is 470 DEG C - 485 DEG C, the solid solution time is 10 - 30 minutes. According to the invention, the deformation and solid solution are carried out alternatively,which avoids the problem that high dislocation concentration generated in the deformation process of single deformation-solid solution leads to the recrystallization of a substrate; the temperature of the pre-solid solution is higher than the general annealing temperature, the pre-solid solution process after pre-deforming reduces the dislocation concentration introduced by deformation through replying and performs a solid solution to most crystallization phases; the pre-solid solution for short time is performed again for dissolving the residual crystallization phases and inhibiting the crystallization of alloys. The invention has the advantages of simple process and convenient operation, and effectively reduces crystallization phases and re-crystallization of the Al-Zn-Mg-Cu system superhigh strength aluminum alloy, the alloy strength, plasticity and fracture toughness of the alloy after quenching and aging are substantially raised; the technology provided in the invention has significance to the development of the aerospace and traffic transportation fields, and is suitable for an industrial application.

Description

technical field [0001] The invention relates to a deformation heat treatment process for improving the strength, plasticity and fracture toughness of an ultra-high-strength aluminum alloy, in particular to a deformation-solution heat treatment process for an Al-Zn-Mg-Cu series aluminum alloy. The invention belongs to the technical field of metal material deformation heat treatment technology. Background technique [0002] Al-Zn-Mg-Cu ultra-high-strength aluminum alloys are an important class of lightweight and high-strength structural materials, which are widely used in aerospace, transportation and other fields. Al-Zn-Mg-Cu ultra-high-strength aluminum alloys usually adopt a single deformation-solution heat treatment process or multiple deformation-intermediate annealing treatment (the annealing temperature is generally 400-420 ° C), and finally a solution treatment to improve its Comprehensive mechanical properties; conventional single deformation-solution process after i...

AI Technical Summary

Problems solved by technology

In addition, in the conventional solution heat treatment process of Al-Zn-Mg-Cu ultra-high-strength aluminum alloy, there is a contradiction between the solid solution crystal phase and the inhibition of recrystallization, that is, to increase the solution temperature or prolong the solution time to completely dissolve Crystalline phase, but intensifies recrystallization, which is not conducive to the improvement of alloy strength, plasticity and fracture toughness

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