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Device and method for preparing nanocrystalline structure of Al-Cu-Mg alloy

A technology of alloy nanocrystals, al-cu-mg, applied in the field of metal material processing, to achieve the effect of uniform grain structure, promoting recrystallization, promoting uniformity and refinement

Inactive Publication Date: 2020-09-11
范语楠
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing research mainly discusses the microstructure evolution and mechanical properties of Al-Cu-Mg alloys under conventional deformation and aging temperature conditions. At present, there is no high-speed shear and recrystallization annealing process applied to the preparation of Al-Cu-Mg alloys. Report on Nanocrystalline Structure

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  • Device and method for preparing nanocrystalline structure of Al-Cu-Mg alloy
  • Device and method for preparing nanocrystalline structure of Al-Cu-Mg alloy
  • Device and method for preparing nanocrystalline structure of Al-Cu-Mg alloy

Examples

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Embodiment 1

[0034] This embodiment provides a method for preparing Al-Cu-Mg alloy nano grain structure, the elemental composition of Al-Cu-Mg alloy in this embodiment is: Cu: 4.51wt.%, Mg: 1.46wt.%, Mn : 0.56wt.%, Si: 0.02wt.%, Fe: 0.01wt.%, the balance Al; the preparation method of the alloy is as follows: take pure aluminum with a purity of 99.98% and place it in a graphite crucible melting furnace, at 840 ° C , heated until all become molten; add the master alloy in sequence, lower the temperature to 720°C, stir thoroughly, and let it stand for 15-25 minutes; 30min; add the slagging agent to the surface of the molten aluminum, the slagging agent used in this embodiment is JY-D1, added at 0.1% to 0.2% of the aluminum alloy melt, the main components are chloride salts and fluorine salts, After standing still for 15-25 minutes, the slag is removed to obtain the alloy melt; the alloy melt is spray-formed with aluminum alloy spray-forming equipment, the pressure of the nitrogen gas is 1.0-2...

Embodiment 2

[0038] Referring to Example 1, this example provides a method for preparing Al-Cu-Mg alloy nanograin structure. The difference from Example 1 is that this example adopts four-pass recrystallization annealing process and four-pass high-speed The above-mentioned Al-Cu-Mg alloy materials were treated alternately by shearing process to prepare nano-grain structure; the temperature of the first recrystallization annealing process was 800K, the heating rate was 620K / min, and the holding time was 20min. The shear rate of the shear plate in the first high-speed shearing process is 95mm / s; the temperature of the second recrystallization annealing process is 800K, the heating rate is 620K / min, and the holding time is 20min. In the first high-speed shearing process, the shear rate of the shear plate was 90mm / s; the temperature of the third recrystallization annealing process was 800K, the heating rate was 620K / min, and the holding time was 20min. The shear rate of the shear plate in the hi...

Embodiment 3

[0040] Referring to Example 1, this example provides a method for preparing Al-Cu-Mg alloy nanograin structure. The difference from Example 1 is that this example adopts four-pass recrystallization annealing process and four-pass high-speed The above-mentioned Al-Cu-Mg alloy materials were treated alternately by shearing process to prepare nano-grain structure; the temperature of the first recrystallization annealing process was 750K, the heating rate was 640K / min, and the holding time was 40min. The shear rate of the shear plate in the first high-speed shearing process is 98mm / s; the temperature of the second recrystallization annealing process is 750K, the heating rate is 640K / min, and the holding time is 40min. In the first high-speed shearing process, the shear rate of the shear plate was 95mm / s; the temperature of the third recrystallization annealing process was 750K, the heating rate was 640K / min, and the holding time was 40min. During the high-speed shearing process, t...

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Abstract

The invention discloses a device and method for preparing a nanocrystalline structure of an Al-Cu-Mg alloy. The method comprises a multi-pass recrystallization annealing step and a multi-pass high-speed shearing treatment step, wherein the recrystallization annealing temperature is 750 - 800K, and the heat preservation time is 20-40min; and a shearing plate I and a shearing plate II which are usedfor carrying out high-speed shearing treatment on the alloy are arranged on the two sides of the Al-Cu-Mg alloy correspondingly, and in the high-speed shearing treatment step, the shearing plate I and the shearing plate II are tightly attached to the surface of the alloy and move up and down at high speed along the surface of the alloy to shear the alloy, so that the alloy generates severe deformation, and the moving directions of the shearing plate I and the shearing plate II are opposite. According to the device and method for preparing the nanocrystalline structure of the Al-Cu-Mg alloy, agrain structure of the Al-Cu-Mg alloy is refined by combining the severe shear deformation and recrystallization annealing processes, so that the comprehensive mechanical property of the alloy is improved.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a device and method for preparing Al-Cu-Mg alloy nano grain structure. Background technique [0002] Al-Cu-Mg alloy has been widely used in aerospace and military fields due to its advantages of high strength, good formability and heat resistance. However, Al-Cu-Mg alloys prepared by existing conventional techniques still cannot meet the application requirements in military industry. The long flaky nano-precipitated phase S' phase is the main strengthening phase in Al-Cu-Mg alloy with low Cu / Mg ratio. Precipitation strengthening is the main strengthening mode of Al-Cu-Mg alloy, and grain refinement is the main Strengthening pathways. [0003] During the large deformation process of high fault energy aluminum alloy polycrystals, due to the different crystallographic orientations of adjacent grains at the grain boundary, the deformation of each grain must coordi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057C22C21/16C22C21/14C22C1/06C22C1/03
CPCC22C1/026C22C1/03C22C1/06C22C21/14C22C21/16C22F1/057
Inventor 范语楠范才河阳建君欧玲严红革何世文郑东升
Owner 范语楠
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