A thermomechanical treatment process for al-cu-li alloy based on particle-induced nucleation
A deformation heat treatment, al-cu-li technology, applied in the field of aerospace components, can solve the problems of Al-Cu-Li alloy recrystallization control is difficult to achieve, secondary recrystallization, low structure stability, etc., to achieve the elimination of solid Dissolution treatment process, reduction of anisotropy, and high degree of recrystallization of the structure
Active Publication Date: 2021-02-19
HARBIN INST OF TECH
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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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Embodiment 1
[0035] Example 1. In this example, through homogenization pretreatment before thermal deformation-thermal deformation-high temperature annealing treatment, low deformation resistance, high stability recrystallization structure and remarkable grain refinement effect were successfully obtained in Al-Cu-Li alloy. The alloy composition used in this example is Al-3.8Cu-1.3Li-0.6Mg-0.6Zn-trace amount of Mn / Zr.
[0036] Step 1. Pretreatment: The alloy ingot is pretreated by two-stage homogenization annealing. The alloy ingot is placed in an air furnace, and the first stage of homogenization annealing is performed first: the temperature is raised to 400°C at a rate of 10°C / s. Temperature non-uniformity ≤ ± 10 ° C, keep warm for 6 hours; after that, perform the second stage of homogenization annealing: heat up to 520 ° C at a rate of 10 ° C / s, control the temperature non-uniformity ≤ ± 5 ° C, and control the maximum temperature ≤ 525 ℃, keep warm for 48h, then cool down to room tempe...
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Abstract
The invention discloses an Al-Cu-Li alloy deformation heat treatment process based on particle-induced nucleation, and belongs to the technical field of aerospace component manufacturing. The invention can significantly promote the thermal deformation recrystallization of the Al-Cu-Li alloy and obtain equiaxed fine-grained structure. The method of the present invention is as follows: the alloy ingot is obtained by homogenizing annealing to obtain uniformly distributed, micron-scale T 1 Phase (Al 2 CuLi), then hot-pressed and deformed, and then annealed at high temperature. The invention realizes controllable acquisition of high-stability recrystallization structure in Al-Cu-Li alloy, high degree of recrystallization, remarkable fine-grain effect, stable structure, can significantly weaken alloy texture, reduce alloy anisotropy, thereby improving alloy multi- bearing capacity and corrosion resistance. The application of the present invention can greatly improve the comprehensive service performance of the Al-Cu-Li alloy, expand its application range in aerospace components, and enhance the competitiveness of products such as materials / components.
Description
technical field [0001] The invention belongs to the field of aerospace components; in particular, it relates to a deformation heat treatment process of Al-Cu-Li alloy 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, and is widely used in aerospace and other fields. It is the most potential and competitive new aluminum alloy. The thermal processing process of Al-Cu-Li alloy mainly includes hot rolling, hot extrusion, forging, etc. The profiles or components prepared by this thermal processing process have mostly flat grains, deformation-recovery structures, and long-term mechanical properties of components. better, but the short transverse / thick direction mechanical properties are not good, and the anisotropy of mechanical properties is more serious; in addition, due to the large number of deformation-recovery structures, the c...
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IPC IPC(8): C22F1/057
CPCC22F1/057
Inventor 甄良王晓雅姜建堂李国爱邵文柱
Owner HARBIN INST OF TECH
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