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Hot working method capable of simultaneously improving electrical conductivity and strength of aluminum alloy

An aluminum alloy and electrical conductivity technology, which is applied in the field of thermal processing to simultaneously improve the electrical conductivity and strength of aluminum alloys, can solve the problems of unstable conductivity of rare earth aluminum conductors, low strength of aluminum alloys, complex rare earth components, etc. High conductivity, high strength effect

Inactive Publication Date: 2015-06-10
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are many problems in the traditional methods of improving the conductivity of aluminum alloys.
Although the addition of rare earth elements or transition metal elements can improve the comprehensive performance of electrical conductivity and strength, due to the complex composition of rare earth elements, active chemical properties, sensitivity to process factors, and the instability of rare earth aluminum conductors, it is widely used Limited to a certain extent, the cost is high
More importantly, the strength of aluminum alloys prepared by existing methods is still low, which also hinders the application range of aluminum alloys as an important conductive and heat-conducting metal material.

Method used

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  • Hot working method capable of simultaneously improving electrical conductivity and strength of aluminum alloy
  • Hot working method capable of simultaneously improving electrical conductivity and strength of aluminum alloy
  • Hot working method capable of simultaneously improving electrical conductivity and strength of aluminum alloy

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specific Embodiment approach

[0039] The thermal processing preparation method of the present invention is further explained and illustrated with data in conjunction with examples below, but the present invention is not limited to these examples.

[0040] For the convenience of comparison, the aluminum alloy used in the examples is a 6××× series (Al—Mg—Si—Cu) aluminum alloy. The specific chemical composition of this alloy is: Mg 0.75wt.%, Si0.75wt.%, Cu 0.8wt.%, Mn 0.15wt.%, Cr 0.15wt.%, Ti 0.01wt.%, Fe 0.20wt. %, and the rest is aluminum. Comparative example also adopts above-mentioned aluminum alloy, and specific method adopts traditional preparation method, such as figure 2 shown. The hardness test is to use HXD-1000T Vickers hardness testing machine to test the hardness of samples with different aging processes. The applied load is 4.9N, and the loading time is 10s. At least 5 points are tested for each sample, and the maximum and minimum values ​​are removed, and the remaining average is calculated...

Embodiment 1

[0044] 6××× aluminum alloy ingots were homogenized in a circulating air resistance furnace at 550°C for 24 hours, then cut and milled, hot rolled into 5mm thick plates, and then solidified in an air circulating resistance furnace at 560°C for 30 minutes. Solvent treatment and water quenching. Then the plate was treated in an oil bath furnace at 250° C. for 1 hour, and finally cold-rolled into a 4 mm thick thin plate (deformation amount 20%) through multiple passes. Subsequently, the plates were subjected to aging treatment at 180°C, 210°C, and 240°C for different times in an oil bath furnace, and the electrical conductivity and hardness of the samples were tested, and then tensile tests were carried out on typical aging aluminum alloys. The artificial aging was carried out in an oil bath furnace with a temperature control accuracy of ±2°C.

Embodiment 2

[0046] 6××× aluminum alloy ingots were homogenized in a circulating air resistance furnace at 550°C for 24 hours, then cut and milled, hot rolled into 5mm thick plates, and then solidified in an air circulating resistance furnace at 560°C for 30 minutes. Solvent treatment and water quenching. Then the plate was treated in an oil bath furnace at 250° C. for 1 hour, and finally cold-rolled into a 3 mm thick thin plate (40% deformation) through multiple passes. Subsequently, the plates were subjected to aging treatment at 180°C, 210°C, and 240°C for different times in an oil bath furnace, and the electrical conductivity and hardness of the samples were tested, and then tensile tests were carried out on typical aging aluminum alloys. The artificial aging was carried out in an oil bath furnace with a temperature control accuracy of ±2°C.

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Abstract

The invention belongs to the technical fields of preparation and heat treatment of metals and alloys, and discloses a hot working method capable of simultaneously improving the electrical conductivity and the strength of an aluminum alloy. The method comprises the following steps: firstly, casting the aluminum alloy to form a cast ingot, carrying out homogenizing treatment and thermal deformation treatment on the cast ingot, thus forming a plate; and sequentially carrying out solid solution and quenching treatment, first artificial ageing treatment, cold deformation treatment and second artificial ageing treatment on the plate which is subjected to thermal deformation treatment. According to the method, only the process order is adjusted; equipment and procedure do not need to be added, but the electrical conductivity and the strength of the prepared aluminum alloy are greatly improved by reasonably controlling the temperatures and the time of twice artificial ageing treatment; the hot working method can be implemented on existing hot working equipment; and extra manufacturing cost is not increased.

Description

technical field [0001] The invention belongs to the technical field of preparation and heat treatment of metals and alloys, and relates to a thermal processing method for simultaneously improving the electrical conductivity and strength of aluminum alloys. Background technique [0002] As a material with many advantages such as high specific strength, good corrosion resistance, and weldability, aluminum alloy has been used in various fields of people's life and industry in recent years, such as automobiles, aviation and other fields. Aluminum alloys also have excellent physical properties, and the electrical conductivity of aluminum is second only to silver, copper and gold, and the price is relatively low. Relatively speaking, the content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third. The oxide film on the surface of aluminum not only has the ability of corrosion resistance, but also has a certain degree of insulation. Based on the ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
CPCC22F1/04
Inventor 陈江华刘春辉陈敬刘力梅伍翠兰
Owner HUNAN UNIV
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