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A prestressed micro-deformation method for improving the elongation of aluminum materials

A technology of elongation and micro-deformation, applied in the field of metal plastic processing, can solve problems such as inappropriate components with special requirements, material size deformation, tissue deformation and large residual stress

Active Publication Date: 2016-01-13
GUANGDONG HONGKING NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the research directly related to the high plastic deformation ability of materials is superplastic materials. The method to make metals superplastic is to make them undergo specific structural denaturation and obtain stable equiaxed ultrafine grains with a grain diameter of less than 10 μm. , the method of severe deformation is usually used to realize the nanometerization and superplasticity of the matrix grains through large strains, and the control and optimization of the temperature, strain rate, and heating method during superplastic deformation make it easier for the metal to obtain superplasticity, but the analysis shows that: through severe deformation The methods of nano-grain and superplasticity are only suitable for aluminum alloys with good ductility, such as deformed aluminum, etc. In other words: the method of improving plasticity or superplasticity through nano-grain is only suitable for certain high-plasticity metal materials; And in the process of severe deformation, the size deformation, tissue deformation and residual stress of the material are very large, which is not suitable for components with special requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1 Irradiation method treatment of 7055 aluminum alloy and its elongation change

[0012] The 7055 aluminum alloy uses Zn, Mg and Cu as the main alloy strengthening elements, and its main components are shown in Table 1 below.

[0013] Table 17055 aluminum alloy composition table

[0014] Zn Mg Cu Zr Fe mn Si Ti Cr Al 8.0 2.2 0.2 0.2 ≤0.10 ≤0.05 ≤0.15 ≤0.06 ≤0.04 Bal

[0015] After smelting and casting and heat treatment, the 7055 aluminum alloy is irradiated with UVB, the photon energy is 5eV, and the light treatment time is 60min. The elongation of the treated material is increased from 7.1% to 22.5%, an increase of 217%. The elongation value increased by 2.17 times, an obvious increase, and the strength increased from 640MPa before treatment to 672MPa, an increase of 5%.

Embodiment 2

[0016] Example 2 Magnetic Field Treatment of Alumina Particles Reinforced 7055 Aluminum Matrix Composite Material and Its Elongation Change

[0017] Alumina particles are generated in the 7055 matrix by the melt direct reaction method, the average particle size is less than 1 μm, and the particle volume fraction is 3vol.%.

[0018] After smelting, casting and heat treatment, the aluminum oxide particle reinforced 7055 aluminum matrix composite material is placed in a pulsed magnetic field with a magnetic induction intensity of 5T. The number of pulses is 40, and the elongation of the material after treatment is increased from 6.7% to 15.5% %, an increase of 131%, that is, an increase of 1.31 times the elongation value of the untreated material, and the strength increased from 698MPa before treatment to 730MPa, an increase of 4.6%.

Embodiment 3

[0019] Example 3 Cold treatment of alumina particles strengthened 7055 aluminum matrix composite material and its elongation change

[0020] Alumina particles are produced in the 7055 matrix by the melt direct reaction method, the average particle size is less than 1 μm, and the particle volume fraction is 3vol.%.

[0021] After smelting and casting and heat treatment, the alumina particle reinforced 7055 aluminum matrix composite material is placed in a cryogenic box, the cooling rate is controlled at 8°C / min, the processing temperature is -175°C, and the processing time is 30h. After the end, it is placed in the air. The elongation of the treated material increased from 6.7% to 19.5%, an increase of 191%, that is, the elongation value of the untreated material increased by 1.91 times, and the strength increased from 698MPa before treatment to 735MPa, an increase of 5.3%.

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Abstract

The invention relates to metal plastic processing, in particular to a prestressed micro-deformation method for increasing the elongation of aluminum materials. Before large-scale plastic deformation of aluminum materials, a stress source is applied to aluminum materials including aluminum alloys or aluminum-based composite materials. The stress source is light treatment, magnetic field treatment or cryogenic treatment to improve the elongation and strength of the aluminum material.

Description

technical field [0001] The invention relates to metal plastic processing, in particular to a prestressed micro-deformation method for improving the elongation of aluminum materials, that is, to apply prestress to the material before deformation processing to promote micro-plastic deformation inside the material. elongation, and simultaneously increase the strength of the material. Background technique [0002] Metal plastic processing is carried out on the premise of high plasticity of materials and under the action of external force. From the perspective of metal plastic processing, having high plastic deformation ability will be one of the important advantages of materials, but as we all know, for metal materials, high strength and Low plasticity is often associated. In actual production, it is often necessary to carry out plastic deformation processing on these gradually emerging "high-strength, low-plasticity" materials. The purpose is to improve the size of the product ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F3/00C22F1/04
Inventor 李桂荣王宏明
Owner GUANGDONG HONGKING NEW MATERIALS TECH CO LTD