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Heat treatment method for pre-aging, re-solid-solution and re-aging of Al-Cu-Li alloy

A heat treatment method and pre-aging treatment technology, applied in the field of aluminum alloy heat treatment and metal material heat treatment, can solve the problems of unusable structural parts, unshown, affecting the dimensional accuracy of structural parts, etc., and achieve improved electrical conductivity and stress corrosion resistance. The effect of improving corrosion resistance, plasticity and stress corrosion resistance

Active Publication Date: 2021-01-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found that the alloy used in this research has undergone pre-stretch deformation treatment, and the alloy has been subjected to pre-stretch deformation again during the re-aging process. Although the performance of the alloy can be improved, in the actual application process, the pre-deformation will change. The initial shape of the structural parts affects the dimensional accuracy of the structural parts, which may make the structural parts unusable, so the aging treatment system is not practical for structural parts in practical applications
In addition, the aging system does not indicate its role in balancing the strength and corrosion resistance of the alloy, and does not analyze and study the stress corrosion resistance and electrochemical corrosion resistance of the alloy after the process, nor does it give information about the crystal Mechanistic Explanation of the Characteristic Evolution of Boundary Precipitated Phases

Method used

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  • Heat treatment method for pre-aging, re-solid-solution and re-aging of Al-Cu-Li alloy
  • Heat treatment method for pre-aging, re-solid-solution and re-aging of Al-Cu-Li alloy
  • Heat treatment method for pre-aging, re-solid-solution and re-aging of Al-Cu-Li alloy

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0051] Single-stage peak aging (T6) treated Al-Cu-Li alloy.

[0052] The material used in the experiment is a 5mm thick Al-Cu-Li alloy extruded plate, and the mass percentage of each chemical composition is: Al-3.0Cu-1.4Li-0.42Mg-0.32Ag-0.26Zn-0.11Zr. Put the processed block sample and the tensile sample of standard size into a tube furnace at 515°C for 90 minutes, then take it out immediately and quench it. The quenching transfer time is <5s. Then put the sample in an oil bath at 170°C for 36 hours, take it out and air cool to room temperature. The hardness test, tensile property test and electrical conductivity test were carried out on the samples after aging treatment.

experiment example 2

[0054] Overaged Al-Cu-Li Alloy

[0055] Put the processed 5mm thick Al-Cu-Li alloy plate sample and the standard size tensile sample into a tube furnace at 515°C for 90min, then take it out immediately and quench it. The quenching transfer time is <5s. Then put the sample into an oil bath at 170°C for 72 hours, take it out and air cool to room temperature. The hardness test, tensile property test and electrical conductivity test were carried out on the samples after aging treatment.

Embodiment 3

[0057] Al-Cu-Li alloys with pre-aging and re-solution treatment

[0058] Put the processed 5mm thick Al-Cu-Li alloy plate sample and the standard size tensile sample into a tube furnace at 515°C for 90min, then take it out immediately and quench it. The quenching transfer time is <5s. Then put the sample in an oil bath at 170°C for 36 hours, take it out and air cool to room temperature. Then put the sample into a tube furnace at 515°C for 90 minutes, then take it out immediately and quench it. The quenching transfer time is <5s. The hardness test, tensile property test and electrical conductivity test were carried out on the samples after pre-aging re-solution treatment.

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Abstract

The invention discloses a heat treatment method for pre-aging, re-solid-solution and re-aging of an Al-Cu-Li alloy, belongs to the field of material heat treatment, and aims to perform conventional solid-solution, pre-aging, re-solid-solution and re-aging treatment on an Al-Cu-Li alloy extruded plate by controlling a heat treatment process system and parameters thereof. The conventional solid solution and re-solid solution treatment temperature is 515 + / -10 DEG C, heat preservation is performed for 60-90 min, then water quenching is performed, and the quenching transfer time is shorter than 5s. The pre-aging and re-aging treatment temperature is 160-180 DEG C, heat preservation is performed for 24-48 hours, and the product is taken out for air-cooling. The strength of the alloy can be reduced through re-solid-solution treatment, the plasticity of the alloy is improved, and correction and reprocessing processes are facilitated. The re-aging treatment can effectively regulate and control the variety, density and distribution of precipitated phases, thereby enhancing the strength of the alloy. In addition, due to coarsening of discontinuous grain boundary precipitated phases in the alloy and increasing of the copper content, on the premise that the strength of the alloy is basically not lost, the stress corrosion resistance, the intergranular corrosion resistance and the electrochemical corrosion resistance are improved, and the plasticity of the alloy is improved. The process is simple and feasible and is not limited by the thickness of the plate.

Description

technical field [0001] The invention relates to a heat treatment method for Al-Cu-Li alloy pre-aging heavy solution re-aging, which belongs to the technical field of metal material heat treatment, in particular to the technical field of aluminum alloy heat treatment. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] As an emerging lightweight alloy material, Al-Cu-Li alloy has been favored for its high elastic modulus, high specific strength and specific stiffness, high damage tolerance, low density, and good weldability. Widely used in aviation, aerospace and military fields, it has become the main substitute material for 2xxx and 7xxx series aluminum alloys. [0004] Al-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057
CPCC22F1/057C22F1/002
Inventor 赵国群陈孝学
Owner SHANDONG UNIV
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