Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Aluminum-lithium alloy two-stage continuous aging treatment method

An aluminum-lithium alloy and aging treatment technology, which is applied in the field of aluminum alloy processing, can solve problems such as difficult to control, slow temperature change rate, and reduced atomic diffusion rate, and achieve the effects of solving production efficiency problems, reducing energy consumption, and shortening aging time

Active Publication Date: 2020-09-18
CENT SOUTH UNIV
View PDF10 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent (patent number CN 102400068A) discloses a non-isothermal aging process for 7xxx series aluminum alloys. It is found that the slower the temperature change rate, the better the effect, especially the secondary precipitation of the alloy when the cooling rate is small is the key to its performance improvement. However, during the cooling process, on the one hand, the increase of supersaturated solute atoms increases the driving force for precipitation; on the other hand, the decrease of atomic diffusion rate leads to a decrease in precipitation rate, so the precipitation mechanism of this process is complicated and difficult to control.
Li Jinfeng et al. proposed a T8 aging method for aluminum-lithium cooling, that is, 160°C is uniformly cooled at 0.6°C / h to 145°C for cooling aging, and then isothermal aging at 145°C. Although compared with T8 isothermal aging treatment, it can maintain plasticity. At the same time, the strength of the alloy is increased, but the strength increase is not obvious at this time (40h) (Rare Metal Materials and Engineering, 2017,46(1):183-188)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Aluminum-lithium alloy two-stage continuous aging treatment method
  • Aluminum-lithium alloy two-stage continuous aging treatment method
  • Aluminum-lithium alloy two-stage continuous aging treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this example, an aluminum-lithium alloy sheet prepared with the same composition and production process as Comparative Example 1 was used, and the solution quenching and pre-deformation processes were also the same as Comparative Example 1.

[0052] Aging process: Put the sample into a resistance furnace heated to 22°C, then raise the temperature to 130°C after 12 hours, and the heating rate during the period is 9°C / h; °C / h, the cooling method is furnace cooling, and the cooling rate with the furnace is <50 °C / h. The final mechanical properties of the obtained materials are shown in Table 1.

[0053] figure 2 b is the transmission electron microscope microstructure picture of this comparative example.

Embodiment 2

[0055] In this example, an aluminum-lithium alloy sheet prepared with the same composition and production process as Comparative Example 1 was used. The sample was subjected to solution treatment by gradually increasing the temperature, and the solution was carried out in a salt bath. After the solution treatment, it was quickly taken out and cooled to room temperature. The quenched samples were subjected to 5% cold rolling pre-deformation.

[0056] Aging process: Put the sample into a resistance furnace heated to 21°C, then raise the temperature to 140°C after 17 hours, and the heating rate during the period is 7°C / h; °C / h, the cooling method is furnace cooling, and the cooling rate with the furnace is <50 °C / h. The final mechanical properties of the obtained materials are shown in Table 1.

Embodiment 3

[0058] In this example, an aluminum-lithium alloy sheet prepared with the same composition and production process as Comparative Example 1 was used. The sample was subjected to solution treatment by gradually increasing the temperature, and the solution was carried out in a salt bath. After the solution treatment, it was quickly taken out and cooled to room temperature. The quenched samples were subjected to 5% cold rolling pre-deformation.

[0059] Aging process: Put the sample into a resistance furnace heated to 0°C, then raise the temperature to 120°C after 10 hours, and the heating rate during the period is 12°C / h; then raise the temperature from 120°C to 150°C over 7.5 hours, during the heating rate is 4°C / h, the cooling method is furnace cooling, and the cooling rate with the furnace is <50°C / h. The final mechanical properties of the obtained materials are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses an aluminum-lithium alloy two-stage continuous aging treatment method, belongs to the technical field of aluminum alloy processing, and relates to the aluminum-lithium alloy two-stage continuous aging heat treatment method. The aging process of an aluminum-lithium alloy is mainly characterized in that an aluminum alloy is subjected to aging treatment in the process of continuously changing the temperature, in the process, different heating rates are carried out in two continuously changing temperature intervals, and the tensile property of the alloy is remarkably improved by reasonably controlling the characteristics of aging precipitation, the temperature intervals and the heating rates and weakening the influence of dislocation recovery. According to the two-stagecontinuous aging process, the performance of the aluminum-lithium alloy is improved, the aging process time is shortened, the energy consumption is reduced, the production efficiency is improved, andthe requirement for the aluminum-lithium alloy with high comprehensive performance at present can be effectively met.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing and relates to a double-stage continuous aging heat treatment method for aluminum-lithium alloys. [0002] technical background [0003] Li is the lightest metal element, every addition of 1% Li in aluminum alloy can reduce the alloy density by 3% and increase the elastic modulus by 6%. Compared with traditional aluminum alloys, Al-Li alloys have the advantages of low density, high specific strength, high specific stiffness, high fracture toughness, and good corrosion resistance. At the same time, aluminum-lithium alloys can reduce aircraft weight and reduce It has more advantages in terms of production cost, so that it has a wide application prospect in the aerospace field. For example, Airbus, Boeing and China Commercial Aircraft have adopted aluminum-lithium alloy components in their latest commercial airliners, which have better achieved the purpose of weight reduction. [0...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22F1/057C22C21/16
CPCC22F1/057C22C21/16
Inventor 刘文胜肖代红吴名冬
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com