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Thermal treatment method for Al-Zn-Mg-Sc-Zr alloy

A heat treatment method and alloy technology, which is applied in the field of cold rolling treatment of Al-Zn-Mg-Sc-Zr alloy after hot rolling and before solid solution, can solve the problem of incomplete dissolution into the matrix, reduction of overall performance of the alloy, and reduction of alloying Effect and other issues, to achieve the effect of improving mechanical properties, increasing the degree of supersaturation, and reducing the probability of cracks

Inactive Publication Date: 2009-08-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology can improve the mechanical properties of the alloy to a certain extent, due to the defects in the design of the process method, the coarse second phase containing Fe, Mn, Sc, and Zr formed in the alloy ingot will be formed in the hot rolling process. And solid solution treatment can not completely dissolve into the matrix, on the one hand, the alloying effect of Sc and Zr elements is reduced, on the other hand, these coarse particles are inconsistent with the deformation of the matrix when the alloy is deformed, resulting in cracks, and finally lead to alloy The overall performance of the

Method used

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  • Thermal treatment method for Al-Zn-Mg-Sc-Zr alloy

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] The aluminum-zinc-magnesium-scandium-zirconium alloy ingot test piece 1 is carried out:

[0016] 1. Hot rolling: 430°C, after 8 passes of hot rolling to 5mm, the deformation is 83.3%;

[0017] 2. Solid solution: heat preservation at 500°C for 1.5h, water quenching;

[0018] 3. Cold rolling: After 3 passes of cold rolling to 2.5mm, the deformation is 50.0%;

[0019] 4. Solid solution: heat preservation at 505°C for 2 hours, water quenching;

[0020] 5. Aging: Aging at 120-130°C for 20-26 hours, and air cooling after being out of the oven. The final product 1 was obtained.

example 2

[0022] The aluminum-zinc-magnesium-scandium-zirconium alloy ingot test piece 2 is carried out:

[0023] 1. Hot rolling: 400℃, after 8 passes of hot rolling to 5mm, the deformation is 83.3%;

[0024] 2. Solid solution: heat preservation at 450°C for 1 hour, water quenching;

[0025] 3. Cold rolling: After 2 passes of cold rolling to 3mm, the deformation is 40.0%;

[0026] 4. Solid solution: heat preservation at 505°C for 1 hour, water quenching;

[0027] 5. Aging: aging at 120-130℃ for 20-26h. Remove from the oven and air cool. The final product 2 was obtained.

example 3

[0029] The aluminum zinc magnesium scandium zirconium alloy ingot test piece 3 is carried out:

[0030] 1. Hot rolling: 400-450°C, after 8 passes of hot rolling to 5mm, the deformation is 83.3%;

[0031] 2. Solid solution: heat preservation at 500°C for 3 hours, water quenching;

[0032] 3. Cold rolling: After 3 passes of cold rolling to 2mm, the deformation is 60%;

[0033] 4. Solid solution: heat preservation at 505°C for 1 hour, water quenching;

[0034] 5. Aging: aging at 120-130℃ for 20-26h. Remove from the oven and air cool. The final product 3 was obtained.

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Abstract

A heat treatment method of Al-Zn-Mg-Sc-Zr alloy comprises such five steps as hot rolling, first solution, cold rolling, second solution and aging. During the first solution, a second-phase is dissolved in a base to obtain supersaturated solution, thus effectively improving the alloying effects of Sc and Zr and at the same time softening the alloy to provide fully softened organism for later cold rolling with comparatively large deformation; the later cold rolling can smash the undissolved coarse phase, thus is beneficial for the coarse phase to be dissolved in the matrix during the second solution, improves the supersaturation level of the base, lowers the probability of the occurrence of cracks during the alloy deformation, and at the same time lays a foundation for aging to precipitate more strengthening phases. Compared with the conventional heat treatable alloy, when the cold rolling deflection of the alloy treated by the method of the invention is 50.0%, the tensile strength and yield strength of the alloy in solution state are respectively improved by 70MPa and 50MPa and the tensile strength and yield strength of the alloy in aging state are respectively improved by 40MPa and 35MPa. The method of the invention is simple in technique and convenient in operation, is applicable to industrial application and provides a new processing method for the improvement of the property of aerospace materials.

Description

technical field [0001] The invention relates to a heat treatment method of Al-Zn-Mg-Sc-Zr alloy, which belongs to the field of material heat treatment, and relates to the cold rolling treatment of Al-Zn-Mg-Sc-Zr alloy after hot rolling and before solid solution. Background technique [0002] Al-Zn-Mg-Sc-Zr alloy has the characteristics of high strength, good plasticity, good weldability, and excellent corrosion resistance. It is widely used in various aircraft structural parts and other high-stress welded structural parts that require high strength. , is an indispensable and important structural material in many military and civil aircrafts and means of transportation. Most of the Al-6.0Zn-2.0Mg-0.2Sc-0.12Zr alloys currently being researched and used adopt the conventional heat treatment system of hot rolling +470°C / 2h+120°C / 24h, and the tensile strength of the solid solution state is 460MPa , The yield strength is 315MPa, the elongation is 18.1%, the tensile strength of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22F1/053
Inventor 李慧中梁霄鹏
Owner CENT SOUTH UNIV
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