Heat treatment method for improving obdurability of 7-series high strength aluminium alloy

A heat treatment method and aluminum alloy technology, applied in the field of heat treatment of metal materials, can solve the problems of high strength and poor toughness of high-strength aluminum alloys, and achieve the effects of improving fracture toughness, increasing supersaturation, and expanding the scope of application.

Inactive Publication Date: 2011-03-30
苏州有色金属研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of high strength and poor toughness of high-strength aluminum alloys, a heat treatment method for improving the strength and toughness of 7××× series high-strength aluminum a

Method used

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  • Heat treatment method for improving obdurability of 7-series high strength aluminium alloy
  • Heat treatment method for improving obdurability of 7-series high strength aluminium alloy
  • Heat treatment method for improving obdurability of 7-series high strength aluminium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Take the 7150 aluminum alloy sheet with 80% hot-rolled deformation after 25mm as an example, its chemical composition (mass fraction%) is Zn 6.45%, Mg 2.30%, Cu 2.10%, Zr 0.10%, Fe 0.05%, Si 0.01% , Al margin.

[0037] Two-stage forced solution treatment: Two-stage forced solution treatment of 7150 alloy, one-stage solution treatment at 420°C for 4 hours, and then two-stage strengthening solution treatment at 450°C for 4 hours.

[0038] After two-stage forced solution, the quenching treatment is cooled to room temperature, the quenching medium is room temperature water, and the quenching transfer time is less than 10s.

[0039] After the two-stage forced solution quenching treatment, pre-stretching is carried out within 4h, and the pre-stretching deformation is 1.5%, which can eliminate the quenching stress and increase the dislocation density in the alloy.

[0040] The pre-stretched alloy was aged at 160°C for 150 minutes, and then rapidly quenched at 80°C for 48 hours.

Embodiment 2

[0042] Take the 7150 aluminum alloy sheet with 80% hot-rolled deformation after 25mm as an example, its chemical composition (mass fraction%) is Zn 6.45%, Mg 2.30%, Cu 2.10%, Zr 0.10%, Fe 0.05%, Si 0.01% , Al margin.

[0043] Two-stage forced solution treatment: Two-stage forced solution treatment of 7150 alloy, one-stage solution treatment at 435℃ for 3 hours, and then two-stage strengthening solution treatment at 470℃ for 2.5 hours.

[0044] After two-stage forced solution, the quenching treatment is cooled to room temperature, the quenching medium is room temperature water, and the quenching transfer time is less than 10s.

[0045] After the two-stage forced solution quenching treatment, pre-stretching is carried out within 3 hours, and the pre-stretching deformation is 2.0%, which can eliminate the quenching stress and increase the dislocation density in the alloy.

[0046] The pre-stretched alloy was aged at 170°C for 90 minutes, and then rapidly quenched at 60°C for 32 hours.

Embodiment 3

[0048] Take the 7150 aluminum alloy sheet with 80% hot-rolled deformation after 25mm as an example, its chemical composition (mass fraction%) is Zn 6.45%, Mg 2.30%, Cu 2.10%, Zr 0.10%, Fe 0.05%, Si 0.01% , Al margin.

[0049] Two-stage forced solution treatment: Two-stage forced solution treatment of 7150 alloy, one-stage solution treatment at 450°C for 2 hours, and then two-stage strengthening solution treatment at 485°C for 2 hours.

[0050] After two-stage forced solution, the quenching treatment is cooled to room temperature, the quenching medium is room temperature water, and the quenching transfer time is less than 10s.

[0051] After two-stage forced solution quenching treatment, pre-stretching is carried out within 1h, and the pre-stretching deformation is 2.8%, which can eliminate the quenching stress and increase the dislocation density in the alloy.

[0052] The pre-stretched alloy was aged at 180°C for 60 minutes, and then rapidly quenched at 120°C for 24 hours.

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Abstract

The invention relates to a heat treatment method for improving the obdurability of a 7-series high strength aluminium alloy, comprising the following steps: firstly carrying out double-stage forced solution treatment on the hot-processing 7***-series high strength aluminium alloy, namely, performing primary solution treatment for 2-4 hours at the temperature of 420-450 DEG C, and performing secondary reinforced solution treatment for 2-4 hours at the temperature of 450-490 DEG C; then quenching and cooling to room temperature, wherein the quenching medium is room temperature water; prestretching within 1-4 hours after quenching, wherein the prestretching distortion is 1-3%; performing high-temperature short-time ageing treatment, wherein the aging temperature is 120-180 DEG C and the aging time is 60-180min; quenching and cooling to room temperature after high-temperature short-time aging treatment, wherein the quenching medium is room temperature water; and finally carrying out low-temperature long-time aging treatment, wherein the aging temperature is 60-120 DEG C, and the aging time is 18-48 hours. The heat treatment method for improving the obdurability of a 7-series high strength aluminium alloy of the invention further improves the fracture toughness property of alloys and broadens the applied range of the aluminium alloys on the basis of maintaining the superhigh alloy strength.

Description

Technical field [0001] The invention relates to a heat treatment method for improving the strength and toughness of 7××× series high-strength aluminum alloys, and belongs to the technical field of heat treatment of metal materials. Background technique [0002] In the 7××× series of high-strength aluminum alloys, as the content of main alloying elements such as Zn and Mg increases, the strength increases and the fracture toughness decreases, which limits the application range of this type of alloy. In order to give full play to the advantages of high-strength aluminum alloys, it is necessary to further improve the fracture toughness of the alloy while maintaining the strength of the ultra-high-strength alloy. [0003] The 7××× series high-strength aluminum alloy is a typical age-strengthened aluminum alloy. A large number of reasonably distributed precipitates are formed in the alloy through reasonable heat treatment to achieve the purpose of strengthening and toughening. In the d...

Claims

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Application Information

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IPC IPC(8): C22F1/053
Inventor 张文静郭富安邓桢桢
Owner 苏州有色金属研究院有限公司
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