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Method for improving corrosion resistance and mechanical properties of aluminum alloy based on severe plastic deformation and high-performance corrosion-resistant aluminum alloy

A technology of severe plastic deformation and corrosion-resistant aluminum alloy, which is applied in the field of nanocrystalline metal materials, can solve problems such as the impact of unrelated material properties, achieve the effects of grain size refinement, change corrosion resistance, and improve mechanical properties

Active Publication Date: 2022-06-24
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing high-pressure torsion method mainly obtains nanocrystalline metal materials by torsional deformation in the same direction under high pressure, but it does not involve the influence of high-pressure torsional deformation mode on material properties

Method used

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  • Method for improving corrosion resistance and mechanical properties of aluminum alloy based on severe plastic deformation and high-performance corrosion-resistant aluminum alloy
  • Method for improving corrosion resistance and mechanical properties of aluminum alloy based on severe plastic deformation and high-performance corrosion-resistant aluminum alloy
  • Method for improving corrosion resistance and mechanical properties of aluminum alloy based on severe plastic deformation and high-performance corrosion-resistant aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0036] A high-performance corrosion-resistant aluminum alloy provided by the present embodiment is obtained according to the following method:

[0037] (1) Obtaining T351-2024 aluminum alloy: In terms of mass percentage, T351-2024 aluminum alloy includes 4.63% Cu, 0.15% Fe, 1.51% Mg, 0.66% Mn, 0.08% Si, 0.05% Zn, and other elements <0.05% , and the rest are Al. The T351-2024 aluminum alloy is a disc with a diameter of 9.8 mm, a height of 0.82 mm, and a pre-stretching deformation of 2%.

[0038] (2) Put the T351-2024 aluminum alloy into the high-pressure torsion system with grooves on both the upper and lower anvils. The diameter of the groove is 10mm. After the T351-2024 aluminum alloy is placed in the middle of the upper and lower anvils, it is basically coupled. And there is a small margin space. The high-pressure torsional deformation is carried out at a high-pressure torsional deformation pressure of 6 Gpa and a torsional deformation speed of 1 r / min, and the torsional cyc...

Embodiment 2

[0040] A high-performance corrosion-resistant aluminum alloy provided by the present embodiment is obtained according to the following method:

[0041] (1) Obtaining T351-2024 aluminum alloy: In terms of mass percentage, T351-2024 aluminum alloy includes 4.63% Cu, 0.15% Fe, 1.51% Mg, 0.66% Mn, 0.08% Si, 0.05% Zn, and other elements <0.05% , and the rest are Al. The T351-2024 aluminum alloy is a disc with a diameter of 9.8 mm, a height of 0.82 mm, and a pre-stretching deformation of 2%.

[0042] (2) Put the T351-2024 aluminum alloy into the high-pressure torsion system with grooves on both the upper and lower anvils. The diameter of the groove is 10mm. After the T351-2024 aluminum alloy is placed in the middle of the upper and lower anvils, the basic coupling is performed. And there is a small margin space. The high-pressure torsional deformation is carried out under the high-pressure torsional deformation pressure of 6 Gpa and the torsional deformation speed of 1 r / min, and ...

Embodiment 3

[0044] (1) Obtaining T351-2024 aluminum alloy: In terms of mass percentage, T351-2024 aluminum alloy includes 4.63% Cu, 0.15% Fe, 1.51% Mg, 0.66% Mn, 0.08% Si, 0.05% Zn, and other elements <0.05% , and the rest are Al. The T351-2024 aluminum alloy is a disc with a diameter of 9.8 mm, a height of 0.82 mm, and a pre-stretching deformation of 2%.

[0045] (2) Put the T351-2024 aluminum alloy into the high-pressure torsion system with grooves on both the upper and lower anvils. The diameter of the groove is 10mm. After the T351-2024 aluminum alloy is placed in the middle of the upper and lower anvils, the basic coupling is performed. And there is a small margin space. The high-pressure torsional deformation is carried out at a high-pressure torsional deformation pressure of 6 Gpa and a torsional deformation speed of 1 r / min, and the torsional cycle is 3 times to obtain a high-performance corrosion-resistant aluminum alloy. Among them, one torsional deformation cycle is to first ...

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Abstract

The present invention provides a method based on severe plastic deformation that can improve the corrosion resistance and mechanical properties of aluminum alloys and a high-performance corrosion-resistant aluminum alloy. The method performs periodic torsional deformation by putting the pre-deformed aluminum alloy into a high-pressure torsion system , high-performance corrosion-resistant aluminum alloys can be obtained. Wherein, one torsional deformation period of the periodic torsional deformation is firstly torsion 180° clockwise, and then 180° counterclockwise, and the number of torsion cycles N≥1 of the periodic torsional deformation. The invention can change the precipitated phase distribution, grain size, dislocation density, etc. of the aluminum alloy through the periodic high-pressure torsional deformation of the high-pressure torsion system, so that the grain size of the aluminum alloy can be refined, thereby improving the mechanical properties of the aluminum alloy. On the other hand, the corrosion resistance of aluminum alloy can also be changed through periodic high-pressure torsional deformation, and then high-performance corrosion-resistant aluminum alloy can be obtained.

Description

technical field [0001] The invention relates to the technical field of nanocrystalline metal materials, and in particular relates to a method for improving the corrosion resistance and mechanical properties of an aluminum alloy based on severe plastic deformation, and a high-performance corrosion-resistant aluminum alloy. Background technique [0002] Nanocrystalline materials refer to materials with grain sizes ranging from 1 to 100 nm. Because the crystals are extremely fine, grain boundaries can account for 50% or more of the entire material. Its atomic arrangement differs from both the ordered crystalline state and the disordered amorphous state. Due to the particularity of its structure, nanocrystalline materials have many excellent properties and broad application prospects. [0003] 2024 aluminum alloy is a commonly used lightweight metal structural material. The homogenized annealed and pre-plastically deformed extruded molten-cast 2024 aluminum alloy (in terms of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/057C22C21/14C22C21/16C22C21/18
CPCC22F1/057C22C21/16C22C21/14C22C21/18
Inventor 陈莹张厚安石祥文杨益航卢博沁陈佳帆
Owner XIAMEN UNIV OF TECH
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