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A method for improving mechanical properties and electrical conductivity of 7 series aluminum alloy

A technology of aluminum alloy and electrical conductivity, which is applied in the field of improving the mechanical properties and electrical conductivity of 7-series aluminum alloys, and can solve the problems that the mechanical properties and electrical conductivity of 7-series aluminum alloy profiles cannot be balanced.

Active Publication Date: 2021-02-09
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, in order to solve the problem that the mechanical properties and electrical conductivity of the 7-series aluminum alloy profiles prepared by the prior art cannot be balanced, the present invention provides a method that can simultaneously improve the mechanical properties and electrical conductivity of the 7-series aluminum alloy

Method used

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  • A method for improving mechanical properties and electrical conductivity of 7 series aluminum alloy
  • A method for improving mechanical properties and electrical conductivity of 7 series aluminum alloy

Examples

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Embodiment 1

[0028] A method for improving the mechanical properties and electrical conductivity of 7-series aluminum alloys, taking the chemical composition of 7075 aluminum alloys as an example, comprises the following steps:

[0029] A. Ingredients: Calculate the amount of each aluminum alloy raw material and prepare the aluminum alloy raw material according to the ratio. The ratio of the mass percentage of each element of the aluminum alloy raw material is as follows:

[0030] element Si Mg Fe Cu mn Cr Ti Zn Impurities Al content 0.07 2.63 0.17 1.62 0.02 0.2 0.02 5.7 0.15 margin

[0031] B. Melting and casting: Add the prepared 7075 aluminum alloy raw materials into the flame reverberatory furnace and evenly mix them to melt into liquid aluminum alloys. Aluminum alloy ingots, where the aluminum alloy raw materials are first baked and cleaned to remove moisture and slag in the furnace before smelting;

[0032] The order of adding 7075 alum...

Embodiment 2

[0040] The difference between Example 2 and Example 1 is that the secondary solid solution time in step F is 120 min, and the dual-stage aging system in step H is 105°C×8h+175°C×12h.

Embodiment 3

[0042] The difference between Example 3 and Example 1 is that the secondary solid solution time in step F is 150 min, and the dual-stage aging system in step H is 105°C×8h+175°C×14h.

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Abstract

The invention belongs to the technical field of aluminum alloy preparation, and relates to a method for improving the mechanical properties and electrical conductivity of 7-series aluminum alloys, including melting and casting, homogenization, extrusion, primary solid solution, pre-stretching, secondary solid solution and double-stage aging , where the homogenization system is 465±5℃×10h, the primary solution temperature is 462℃, the solution time is 100min, the pre-stretching stretch rate is ≤3%, and the solution temperature of the secondary solution is 460±5℃ , solid solution time ≤ 150min, double-stage aging is to put the aluminum alloy rods after the second solid solution into the aging furnace for heat preservation and aging, 105℃×8h+175℃×10~14h, the mechanical properties of the final prepared aluminum alloy profiles Performance and conductivity have been improved simultaneously to meet production requirements.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy preparation and relates to a method for improving the mechanical properties and electrical conductivity of 7 series aluminum alloys. Background technique [0002] With the development of the aerospace industry, there are gradually higher requirements for the comprehensive performance of aluminum profiles. The strength and hardness of aluminum alloy materials can no longer reflect its comprehensive performance. The index of electrical conductivity has attracted more and more attention. , for the 7-series aluminum alloy needs to have both high strength and good electrical conductivity. The methods tried in the past, such as alloying, strain strengthening and precipitation strengthening, etc., will enhance the scattering of conductive electrons due to the increase of solid-solution atoms of alloy elements, the introduction of crystal defects (point defects, dislocations, grain boundaries, etc....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/053
Inventor 庞俊铭胡皓周广宇董政刘阳
Owner CHINA ZHONGWANG
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