Preparation method of aging-free high-strength and high-ductility aluminum alloy based on large deformation homogenization

A homogenization and large deformation technology, which is applied in the field of aluminum alloy processing, can solve problems such as difficulty in shortening the production cycle of alloys, and achieve the effects of increasing solid solubility, promoting dissolution, and reducing deformation temperature

Active Publication Date: 2019-11-05
江苏江南创佳型材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above solid solution process has a certain effect on improving the solid solution degree of 7XXX series alloys, it is still difficult to shorten the production cycle of such alloys

Method used

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  • Preparation method of aging-free high-strength and high-ductility aluminum alloy based on large deformation homogenization
  • Preparation method of aging-free high-strength and high-ductility aluminum alloy based on large deformation homogenization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Cut a billet with a size of 50mm×50mm×100mm from a 7050 aluminum alloy ingot; place the billet in a rotary equal-channel angular extrusion die, and perform 8-pass continuous equal-channel angular extrusion at a temperature of 450°C processing, followed by water quenching to obtain a supersaturated solid solution block extrusion billet; cutting out an alloy rod with a diameter of 45mm from the above block extrusion billet, the length direction of the alloy rod is parallel to the direction of equal channel corner extrusion; for the alloy The rod is subjected to hot extrusion processing, the extrusion temperature is 350°C, the extrusion speed is 0.8m / min, and the extrusion ratio is 15. After extrusion, it is water quenched to obtain an aging-free high-strength aluminum alloy based on large deformation homogenization.

Embodiment 2

[0029] Cut a billet with a size of 50mm×50mm×100mm from a 7050 aluminum alloy ingot; place the billet in a rotary equal-channel angular extrusion die, and perform 6-pass continuous equal-channel angular extrusion at a temperature of 480°C processing, followed by water quenching to obtain a supersaturated solid solution block extrusion billet; cutting out an alloy rod with a diameter of 45mm from the above block extrusion billet, the length direction of the alloy rod is parallel to the direction of equal channel corner extrusion; for the alloy The rod is subjected to hot extrusion processing, the extrusion temperature is 320°C, the extrusion speed is 0.6m / min, and the extrusion ratio is 20. After extrusion, it is water-quenched to obtain an aging-free high-strength aluminum alloy based on large deformation homogenization.

Embodiment 3

[0031] Cut a billet with a size of 50mm×50mm×100mm from a 7050 aluminum alloy ingot; place the billet in a rotary equal-channel angular extrusion die, and perform 7-pass continuous equal-channel angular extrusion at a temperature of 470°C processing, followed by water quenching to obtain a supersaturated solid solution block extrusion billet; cutting out an alloy rod with a diameter of 45mm from the above block extrusion billet, the length direction of the alloy rod is parallel to the direction of equal channel corner extrusion; for the alloy The rod is subjected to hot extrusion processing, the extrusion temperature is 300°C, the extrusion speed is 1.2m / min, and the extrusion ratio is 35. After extrusion, it is water quenched to obtain an aging-free high-strength aluminum alloy based on large deformation homogenization.

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Abstract

The invention discloses a preparation method of an aging-free high-strength and high-ductility aluminum alloy based on large deformation homogenization. The production method comprises the following steps of A, cutting 7XXX-series aluminum alloy cast ingots to obtain blanks; B, conducting continuous equal-channel angular pressing machining on the blanks at the solution temperature to realize largedeformation homogenization and obtaining supersaturated solid solution block extrusion blanks; C, cutting the block extrusion blanks into alloy bars of which the length direction is parallel to the equal-channel angular pressing direction; and D, conducting hot extrusion processing on the alloy bars to obtain the aging-free high-strength and high-ductility aluminum alloy based on large deformation homogenization. Through the preparation method, the large deformation homogenization effect is achieved through continuous equal-channel angular pressing at the solid solution temperature, the defect density of the homogenized alloy is increased, grains are refined through follow-up hot extrusion, dynamic precipitation of nano precipitated phases is promoted, the aluminum alloy structure with the refined grains and uniform and high-density nano precipitated phases is obtained, and the strength and ductility of the alloy are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and specifically relates to the preparation of an aging-free high-strength and tough aluminum alloy based on large deformation homogenization, which adopts equal channel angular extrusion to realize complete solution treatment and uses subsequent hot extrusion to promote dynamic precipitation. method. Background technique [0002] 7XXX series aluminum alloys have high strength, low density, good processability and stress corrosion cracking resistance, and are often processed into various types of materials and widely used in aerospace and rail transportation and other fields. The 7XXX series aluminum alloys use Zn and Mg as the main alloying elements, including Al-Zn-Mg and Al-Zn-Mg-Cu two main alloy series. This type of alloy is a typical precipitation-strengthened aluminum alloy. Using metastable precipitates such as Mg-Zn or Al-Mg-Zn precipitated by aging can significantly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053
CPCC22F1/002C22F1/053
Inventor 梅泽锋周宝华黄晓中董春泉
Owner 江苏江南创佳型材有限公司
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