Method for improving mechanical property and electrical conductivity of 7-series aluminum alloy

An aluminum alloy and electrical conductivity technology, 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 taken into account.

Active Publication Date: 2019-09-24
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...

Method used

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  • Method for improving mechanical property and electrical conductivity of 7-series aluminum alloy
  • Method for improving mechanical property 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 property and electrical conductivity of a 7-series aluminum alloy. The method comprises the following steps of casting, homogenizing, extruding, primary solution treatment, pre-stretching, secondary solution treatment and double-stage aging, wherein the homogenizing system is 465 +/-5 DEG C*10h, the primary solution temperature is 462 DEG C, the primary solution time is 100 minutes, the pre-stretching elongation is less than or equal to 3%, the secondary solution temperature is 460 +/-5 DEG C, the secondary solution time is less than or equal to 150 minutes, in the double-stage aging step, an aluminum alloy bar material subjected to secondary solution is put into an aging furnace for heat preservation aging with the system of 105 DEG C*8h+175 DEG C*10-14h, the mechanical property and the electrical conductivity of finally prepared aluminum alloy sections are synchronously improved, and the production requirements are met.

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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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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