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A method for improving the comprehensive performance of ultra-high-strength aluminum alloys by combining two-pass ecap processing

A comprehensive performance, aluminum alloy technology, applied in the field of combining two-pass ECAP processing to improve the comprehensive performance of ultra-high strength aluminum alloys Corrosion performance improvement and strength improvement effect

Active Publication Date: 2018-10-02
江苏国鑫铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to solve the problems of poor plasticity and poor corrosion resistance of the existing 7000 series ultra-high-strength aluminum alloys (such as Al-Zn-Mg-Cu), and to invent a combination of two-pass ECAP processing to improve the ultra-high-strength aluminum alloys. comprehensive performance approach

Method used

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  • A method for improving the comprehensive performance of ultra-high-strength aluminum alloys by combining two-pass ecap processing
  • A method for improving the comprehensive performance of ultra-high-strength aluminum alloys by combining two-pass ecap processing
  • A method for improving the comprehensive performance of ultra-high-strength aluminum alloys by combining two-pass ecap processing

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Embodiment 1

[0025] A method for improving the comprehensive properties of an ultra-high-strength aluminum alloy (Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.0435Sr), comprising the following steps:

[0026] First, cut and sample the workpiece, and then perform overaging treatment. The overaging process is (400±10)°C×(48±1)h, and then heat the sample to 420±10°C (preheating the mold To be realized), and after 2±0.5h of heat preservation, put it into the ECAP mold for two passes of C-mode ECAP processing. After one ECAP process, the sample needs to be rotated 180° around the axis, and then the sample is heated to 420±10°C (which can be achieved by preheating the mold), and after 2±0.5h of heat preservation, the second Pass ECAP processing. In order to prevent the sample from cracking during the extrusion process, a layer of copper sleeve can be wrapped around the sample to protect the sample. After the ECAP processing is completed, the sample needs to be heated to 420±10°C and held for 2±0.5h, and ...

Embodiment 2

[0032]A method for improving the comprehensive performance of an ultra-high-strength aluminum alloy (Al-12.18-12.51Zn-2.85-3.31Mg-1.43-2.83Cu-0.18-0.20Zr-0.0435-0.0598Sr), comprising the following steps:

[0033] Cut and sample the ultra-high-strength aluminum alloy with a mass fraction of , and then perform overaging treatment. The overaging process is 400±10℃×48±1h, and then put the sample into the ECAP mold for two passes B C Mode ECAP processing. After one ECAP process, the sample needs to be rotated 90° around the axis, and then the second ECAP process is performed. Before the second pass of ECAP processing, the sample needs to be heat-preserved at 420±10℃×2±0.5 h, and the mold should be preheated. In order to prevent the sample from cracking during the extrusion process, a layer of copper sleeve should be wrapped around the sample to protect the sample. After the ECAP processing is completed, the sample needs to be heated to 420±10°C and kept for 2±0.5h, and then subje...

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Abstract

The invention discloses a method for improving comprehensive performance of super-high strength aluminum alloy in combination with two-pass ECAP machining. The method is characterized by including pretreatment and aftertreatment. The pretreatment includes 400+ / -10 DEG C*48+ / -1 h overageing treatment, two-pass equal channel angular pressing (ECAP) machining and hot compression deformation machining enabling the screw-down rate to be at least 50% after 420+ / -10 DEG C*2+ / -0.5 h thermal-insulation treatment; aftertreatment includes pre-reply annealing treatment of 250+ / -10 DEG C*24+ / -1 h+300+ / -10 DEG C*6+ / -1 h+350+ / -10 DEG C*6+ / -1 h+400+ / -10 DEG C*6+ / -1 h, solution treatment and ageing strengthening heat treatment. While the strength of the alloy is substantially improved, the properties of resistance to intergranular corrosion and exfoliation corrosion can be remarkably improved, and the resistance to corrosion is improved to a maximum degree. The comprehensive performance of the super-high strength aluminum alloy can be effectively improved.

Description

technical field [0001] The invention relates to a method for improving the comprehensive performance of metal materials, especially a method for improving the strength, plasticity and corrosion resistance of 7000 series ultra-high-strength aluminum alloys, specifically a method for comprehensively utilizing overaging treatment, two-pass and other channels Angle extrusion (ECAP) processing, thermal compression, pre-recovery, solid solution, and aging treatment technologies are used to improve the comprehensive performance of ultra-high-strength aluminum alloys. Background technique [0002] Al-Zn-Mg-Cu (7000) series aluminum alloy is widely used in aerospace, aerospace, Industries such as weaponry and equipment manufacturing and transportation have been widely used. With the further upgrading of China's manufacturing industry, modern industry has higher and higher performance requirements for high-strength aluminum alloys, which has increased people's enthusiasm for optimizi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/053
CPCC22F1/002C22F1/053
Inventor 许晓静蔡成彬黄锦栋居士浩张可人丁清汪成松刘志刚张晓宇童浩
Owner 江苏国鑫铝业有限公司
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