Al-Cu-Li alloy deformation heat treatment process based on particle stimulated nucleation

Abstract

The invention discloses an Al-Cu-Li alloy deformation heat treatment process based on particle stimulated nucleation, and belongs to the technical field of aerospace component manufacturing. Accordingto the process, an Al-Cu-Li alloy can be remarkably promoted to be subject to thermal deformation and recrystallization to obtain an isometric fine crystal structure. The process comprises the following steps of carrying out homogenizing annealing on an alloy ingot to obtain a uniformly-distributed micron-scale T1 phase (Al2CuLi), then performing hot-pressing deformation, and annealing at a hightemperature. According to the process, the high-stability recrystallization structure in the Al-Cu-Li alloy can be obtained controllably, the recrystallization degree is high, the fine crystal effectis obvious, the structure is stable, the alloy texture can be remarkably weakened, the alloy anisotropy is reduced, and therefore the multi-directional bearing performance and the corrosion resistanceof the alloy are improved, the comprehensive service performance of the Al-Cu-Li alloy can be greatly improved, the application range of the Al-Cu-Li alloy in aerospace components can be extended, and the competitiveness of products such as materials / components can be improved

Description

technical field [0001] The invention belongs to the field of aerospace components, and in particular relates to an Al-Cu-Li alloy deformation heat treatment process based on particle excitation nucleation. Background technique [0002] Al-Cu-Li alloy has the characteristics of low density, high strength and toughness, high specific modulus and damage resistance. It is widely used in aerospace and other fields, and is the most potential and competitive new aluminum alloy. The hot working process of Al-Cu-Li alloy mainly includes hot rolling, hot extrusion, forging, etc. The grains of the profiles or components prepared by this hot working process are mostly flat, deformed-recovery structure, and the longitudinal mechanical properties of the components are However, the mechanical properties in the short transverse / thick direction are poor, and the anisotropy of the mechanical properties is serious; in addition, due to the existence of a large number of deformation-recovery str...

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Problems solved by technology

Although recrystallization has positive significance for the regulation of the microstructure and properties of aluminum alloys, the recrystallization control of Al-Cu-Li alloys is not easy to achieve

Fully recrystallized structure can be obtained in Al-Cu-Li alloy sheet by cold rolling + annealing process, but this process cannot be used in the production of medium and thick plates; moreover, the stability of recrystallized structure obtained by this process is low , grain coarsening and secondary recrystallization are prone to occur in the subsequent heat treatment processes such as high temperature annealing and solid solution, resulting in loss of control of the structure

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