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A kind of trace element composite strengthening 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, increase cost, etc., and achieve the effect of avoiding complex process, inhibiting grain growth and high production efficiency.

Active Publication Date: 2022-08-02
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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  • A kind of trace element composite strengthening high-strength aluminum-lithium alloy and preparation method thereof
  • A kind of trace element composite strengthening high-strength aluminum-lithium alloy and preparation method thereof
  • A kind of trace element composite strengthening 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 strengthening high-strength aluminum-lithium alloy and a preparation method. In terms of weight percentage, the high-strength cast aluminum-lithium alloy is composed of: Cu 4.0-5.5wt%, Li 1.5-2.3wt%, Mg 0.5-1.0wt%, Zn 0.5-1.5wt%, Ti 0.05-0.2wt%, Zr 0.05-0.2wt%, RE 0.1-0.5wt%; wherein the element represented by RE is selected from one of Ce, Er and Sc species or several. The high-strength aluminum-lithium alloy of the present invention has a tensile strength of 430-520MPa, an elongation of 3-8%, and an elastic modulus of 85-87GPa. The invention 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, in particular to a trace element composite strengthening high-strength aluminum-lithium alloy and a preparation method. Background technique [0002] At present, the use of aluminum-lithium alloy structural parts in large aerospace vehicles has been increasing, and it is gradually replacing the traditional 2xxx series and 7xxx series aluminum alloys to achieve the purpose of reducing the weight of the overall structure. At present, the relatively mature third-generation aluminum-lithium alloys generally adopt the method of reducing Li content to avoid the low fracture toughness and anisotropy of the second-generation aluminum-lithium alloys. At the same time, the Cu content is increased to make the Cu / Li ratio in the alloy reach a certain range, and specific nano-strengthening phases, such as Al, are precipitated inside the alloy through solution-aging treatment. 2 CuLi (T1 phase)...

Claims

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Application Information

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Patent Type & Authority Patents(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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