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Microelement composite reinforced high-strength aluminum-lithium alloy and preparation method thereof

A trace element, high-strength technology, applied in the field of aluminum-lithium alloy materials, can solve the problems of complex process, easy oxidation of Li element, low yield, etc., to avoid complex process, inhibit grain growth, and low vacuum requirement Effect

Active Publication Date: 2022-05-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the strength and modulus of elasticity faced by traditional cast aluminum-lithium alloys which are far lower than those of deformed alloys and the two cannot be improved simultaneously, and the preparation process of high-strength cast aluminum-lithium alloys in the prior art is complicated, and the preparation method is not suitable for industrial production problem, and the existing technology increases the cost by adding a higher content of Li element, and the Li element is easily oxidized in the preparation process, the yield is low, and the elastic modulus cannot be effectively improved. A kind of trace element composite strengthening is provided. High-strength aluminum-lithium alloy and its preparation method, the method is simple to prepare the aluminum-lithium alloy, and the obtained alloy product has the characteristics of high strength, high elastic modulus and low production cost, and is suitable for large-scale industrial production

Method used

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  • Microelement composite reinforced high-strength aluminum-lithium alloy and preparation method thereof
  • Microelement composite reinforced high-strength aluminum-lithium alloy and preparation method thereof
  • Microelement composite reinforced high-strength aluminum-lithium alloy and preparation method thereof

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Embodiment 1

[0040]The preparation of high-strength cast aluminum-lithium alloy by the method of the present application includes the following steps:

[0041] S1: Prepare raw materials according to the required alloy composition, and preheat the raw materials: Considering the burning loss of elements, Cu, Li, Mg, and Zn all use master alloys in the configuration of raw materials, which are Al-60%Cu, Al- 20%Li, Al-30%Mg, Al-30%Zn, the burn loss rates considered for the above master alloys are 5%, 10%, 10%, and 5%, respectively. The prepared raw materials were kept in an air heating furnace for 1 hour at a temperature of 220°C. The master alloy of Mg and Li is dried in a vacuum drying oven to remove moisture.

[0042] S2: vacuum smelting the raw materials to obtain molten metal after smelting: before smelting, the graphite crucible needs to be coated with boron nitride coating, the mass fraction of solid boron nitride in the boron nitride coating must be greater than 70%, and the coating t...

Embodiment 2

[0049] The preparation of high-strength cast aluminum-lithium alloy by the method of the present application includes the following steps:

[0050] S1: Prepare raw materials according to the required alloy composition, and preheat the raw materials: Considering the burning loss of elements, Cu, Li, Mg, and Zn all use master alloys in the configuration of raw materials, which are Al-60%Cu, Al- 20%Li, Al-30%Mg, Al-30%Zn, the burn loss rates considered by the above master alloys are 5%, 15%, 10%, and 5%, respectively. The prepared raw materials were kept in an air heating furnace for 1 hour at a temperature of 220°C. The master alloy of Mg and Li is dried in a vacuum drying oven to remove moisture.

[0051] S2: vacuum smelting the raw materials to obtain molten metal after smelting: before smelting, the graphite crucible needs to be coated with boron nitride coating, the mass fraction of solid boron nitride in the boron nitride coating must be greater than 70%, and the coating t...

Embodiment 3

[0058] The preparation of high-strength cast aluminum-lithium alloy by the method of the present application includes the following steps:

[0059] S1: Prepare raw materials according to the required alloy composition, and preheat the raw materials: Considering the burning loss of elements, Cu, Li, Mg, and Zn all use master alloys in the configuration of raw materials, which are Al-60%Cu, Al- 20%Li, Al-30%Mg, Al-30%Zn, the burn loss rates considered by the above master alloys are 5%, 15%, 10%, and 5%, respectively. The prepared raw materials were kept in an air heating furnace for 1 hour at a temperature of 220°C. The master alloy of Mg and Li is dried in a vacuum drying oven to remove moisture.

[0060] S2: vacuum smelting the raw materials to obtain molten metal after smelting: before smelting, the graphite crucible needs to be coated with boron nitride coating, the mass fraction of solid boron nitride in the boron nitride coating must be greater than 70%, and the coating t...

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Abstract

The invention discloses a trace element composite reinforced high-strength aluminum-lithium alloy and a preparation method thereof, and the high-strength cast aluminum-lithium alloy comprises the following components in percentage by weight: 4.0 to 5.5 wt% of Cu, 1.5 to 2.3 wt% of Li, 0.5 to 1.0 wt% of Mg, 0.5 to 1.5 wt% of Zn, 0.05 to 0.2 wt% of Ti, 0.05 to 0.2 wt% of Zr, 0.1 to 0.5 wt% of RE, and the balance of Al. Wherein the element represented by RE is selected from one or more of Ce, Er and Sc. According to the high-strength aluminum-lithium alloy, the tensile strength is 430-520 MPa, the ductility is 3-8%, and the elastic modulus is 85-87 GPa. The method is suitable for the field of aluminum-lithium alloy materials.

Description

technical field [0001] The invention belongs to the field of aluminum-lithium alloy materials, and in particular relates to a trace element compound strengthened high-strength aluminum-lithium alloy and a preparation method thereof. Background technique [0002] At present, the use of aluminum-lithium alloy structural parts in large aerospace vehicles has been increasing, and is gradually replacing traditional 2xxx and 7xxx aluminum alloys to achieve the purpose of overall structural weight reduction. At present, the third-generation aluminum-lithium alloys that have developed relatively mature generally adopt the method of reducing the Li content to avoid the weaknesses of low fracture toughness and anisotropy faced by the second-generation aluminum-lithium alloys. At the same time, increase the Cu content, so that the Cu / Li ratio in the alloy reaches a certain range, and through solid solution-aging treatment, a specific nano-strengthening phase, such as Al, is precipitate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/16C22C21/18C22C1/02C22F1/057
CPCC22C21/16C22C21/18C22C1/026C22F1/057C22F1/002
Inventor 王俊升杨兴海田光元薛程鹏李星星
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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