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Solution-aging heat treatment process of a super-strength and high-toughness al-zn-mg-cu aluminum alloy

A technology of aging heat treatment and three-stage aging treatment, which is applied in the field of aluminum alloy heat treatment, can solve the problems such as alloys are difficult to meet, and achieve the effect of improving strength and plastic toughness, ultra-high strength and high plastic toughness, and fine distribution of precipitated phases in the crystal

Active Publication Date: 2022-04-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims at the problem that the current high-strength and high-toughness aluminum alloy solution-aging heat treatment process is difficult to better match the comprehensive properties such as strength, plasticity, and toughness, which leads to the problem that the alloy is difficult to meet the needs of the aerospace and rail transit fields. Based on data-driven machine learning method, developed a new super-strength and high-toughness aluminum alloy solution-aging heat treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] For the new super strong and high toughness Al-Zn-Mg-Cu aluminum alloy (Zn content is 8.28wt%, Mg content is 2.38wt%, Cu content is 1.73wt%, Mn content is 0.05wt%, Cr content is 0.10wt%) %, the Zr content is 0.10wt%, the Ti content is 0.08wt%, the Fe content is 0.01wt%, the Si content is 0.01wt%, and the balance is Al.)

[0020] The solid solution-aging heat treatment process of the super-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy of the present invention is characterized in that three-stage solid solution treatment + three-stage aging treatment are adopted, and the solid solution and aging temperatures increase step by step. The specific plan is as follows:

[0021] (1) Three-stage solid solution treatment: heat the extruded aluminum alloy at 440°C for 2 hours, and perform the first-stage solid solution;

[0022] Then, it was kept at 460°C for 1 hour to carry out the second solid solution; finally, it was kept at 480°C for 0.5h to carry out the third solid...

Embodiment 2

[0026] For the new super strong and high toughness Al-Zn-Mg-Cu aluminum alloy (Zn content is 8.90wt%, Mg content is 2.29wt%, Cu content is 1.76wt%, Mn content is 0.10wt%, Cr content is 0.14wt%) %, the Zr content is 0.10wt%, the Ti content is 0.06wt%, the Fe content is 0.02wt%, the Si content is 0.01wt%, and the balance is Al.)

[0027] The solid solution-aging heat treatment process of the ultra-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy of the present invention is characterized in that: three-stage solid solution treatment + three-stage aging treatment is adopted, and the solid solution and aging temperatures of different stages gradually rise. The specific plan is as follows:

[0028] (1) Three-stage solid solution treatment: heat the extruded aluminum alloy at 450°C for 4 hours to perform the first stage solid solution; then hold it at 470°C for 2 hours to perform the second stage solid solution; finally heat it at 480°C 0.5h, carry out the third solid solution...

Embodiment 3

[0032] For the new super strong and high toughness Al-Zn-Mg-Cu aluminum alloy (Zn content is 9.30wt%, Mg content is 2.18wt%, Cu content is 1.80wt%, Mn content is 0.09wt%, Cr content is 0.17wt%) %, the Zr content is 0.14wt%, the Ti content is 0.06wt%, the Fe content is 0.02wt%, the Si content is 0.01wt%, and the balance is Al.)

[0033] The solid solution-aging heat treatment process of the ultra-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy of the present invention is characterized in that: three-stage solid solution treatment + three-stage aging treatment is adopted, and the solid solution and aging temperatures of different stages gradually rise. The specific plan is as follows:

[0034] (1) Three-stage solid solution treatment: heat the extruded aluminum alloy at 440°C for 6 hours for the first stage of solid solution; then hold it for 2 hours at 460°C for the second stage of solid solution; finally heat it at 480°C 0.5h, carry out the third solid solution, and th...

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Abstract

The invention discloses a solid solution-aging heat treatment process for a super-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy, which belongs to the technical field of aluminum alloy heat treatment. The aluminum alloy solid solution-aging process of the present invention takes into account comprehensive performance requirements such as high strength, high plasticity and high toughness of the alloy, and is characterized in that: three-stage solid solution treatment + three-stage aging treatment is adopted, and the solid solution and aging temperatures increase step by step. The super-strength and high-toughness aluminum alloy solution-aging heat treatment process of the present invention is preferentially applicable to but not limited to the new super-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy. Compared with the traditional T6 single-stage peak aging treatment process, the present invention The distribution of intragranular precipitates in the alloy microstructure obtained by solid solution-aging process is more uniform and fine, and the distribution of grain boundary precipitates changes from continuous chain distribution to discontinuous distribution, which can significantly improve the overall performance of the alloy. The tensile strength is >750MPa, and the extension Rate>12%, Fracture Toughness>35MPa·mm 1 / 2 . Moreover, the process has low cost and short process, and is suitable for large-scale industrial production of high-performance aluminum alloys.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy heat treatment, and in particular provides a heat treatment process for a super-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy, which meets the needs of the aerospace field for a high-performance aluminum alloy heat treatment process. Background technique [0002] With the rapid development of aerospace, rail transit and other fields, higher requirements are put forward for the comprehensive performance of high-strength and high-toughness aluminum alloys. Other main performance indicators such as processability and corrosion resistance are comparable to the advanced aluminum alloys 7050 (US3881966), 7055 (US5221377A) and 7136 (US7214281B2) widely used at present. [0003] At present, the main ways to develop high-performance aerospace aluminum alloys are composition optimization and process regulation. For example, single-stage peak aging treatment can make aluminum alloy obtain hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22F1/053C22C21/10
Inventor 谢建新张志豪付华栋姜磊
Owner UNIV OF SCI & TECH BEIJING