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A kind of ultra-low density aluminum-lithium alloy and preparation method thereof

An aluminum-lithium alloy, ultra-low density technology, applied in the field of aluminum alloys, can solve problems such as insufficient plasticity and toughness, achieve the effects of reducing oxidation slag inclusions, ensuring yield, and improving performance uniformity

Active Publication Date: 2022-04-15
郑州轻研合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a high-ultra-low-density aluminum-lithium alloy and its preparation method. The present invention solves the lack of plasticity and toughness caused by high lithium content and high magnesium content by designing and optimizing the alloy composition problem, so as to obtain an ultra-low density aluminum-lithium alloy with good stiffness and ductility

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  • A kind of ultra-low density aluminum-lithium alloy and preparation method thereof
  • A kind of ultra-low density aluminum-lithium alloy and preparation method thereof
  • A kind of ultra-low density aluminum-lithium alloy and preparation method thereof

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Embodiment 1

[0030] like figure 1 As shown, an ultra-low density aluminum-lithium alloy is composed of the following mass percentage components: magnesium: 9.0%, lithium: 2.1%, beryllium: 0.01%, manganese: 0.1%, zinc: 0.1%, rare earth: 0.05%, The balance is aluminum.

[0031] like figure 2 Shown, a kind of preparation method of ultra-low density aluminum-lithium alloy comprises the following steps:

[0032] S1, alloy smelting, mixing all raw materials, and preheating to 100°C at a constant speed, at the same time, decompressing the melting furnace, heating up and preheating and feeding argon, and making the internal vacuum of the melting furnace reach to 2Pa, the temperature is constant at 300°C, and finally the preheated raw material mixture is added to the vacuum induction melting furnace, and the temperature is raised to 740°C at a constant speed for heat preservation and melting to obtain molten metal;

[0033] S2, vacuum refining, after completing step S1, mechanically stir the ob...

Embodiment 2

[0043] like figure 1As shown, an ultra-low density aluminum-lithium alloy is composed of the following mass percentage components: magnesium: 12.5%, lithium: 3.5%, beryllium: 0.1%, manganese: 0.5%, zinc: 0.5%, rare earth: 0.5%, The balance is aluminum.

[0044] Such as figure 2 Shown, a kind of preparation method of ultra-low density aluminum-lithium alloy comprises the following steps:

[0045] S1, alloy smelting, mixing all raw materials, and preheating to 260°C at a constant speed, at the same time, decompressing the melting furnace, heating up and preheating and feeding argon, and making the internal vacuum of the melting furnace reach to 2Pa, the temperature is constant at 560°C, and finally the preheated raw material mixture is added to the vacuum induction melting furnace, and the temperature is raised to 780°C at a constant speed for heat preservation and melting to obtain molten metal;

[0046] S2, vacuum refining, after completing step S1, the obtained molten met...

Embodiment 3

[0056] Such as figure 1 As shown, an ultra-low density aluminum-lithium alloy is composed of the following mass percentage components: magnesium: 11%, lithium: 2.8%, beryllium: 0.05%, manganese: 0.3%, zinc: 0.35%, rare earth: 0.2%, The balance is aluminum.

[0057] Such as figure 2 Shown, a kind of preparation method of ultra-low density aluminum-lithium alloy comprises the following steps:

[0058] S1, alloy smelting, mixing all raw materials, and preheating to 160°C at a constant speed, at the same time, decompressing the melting furnace, heating up and preheating and feeding argon, and making the internal vacuum of the melting furnace reach to 2Pa, the temperature is constant at 460°C, and finally the preheated raw material mixture is added to the vacuum induction melting furnace, and the temperature is raised to 750°C at a constant speed for heat preservation and melting to obtain molten metal;

[0059] S2, vacuum refining, after completing the step S1, the obtained mo...

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Abstract

The invention provides an ultra-low density aluminum-lithium alloy, which is composed of the following components in mass percentage: magnesium: 9.0%-12.5%, lithium: 2.1%-3.5%, beryllium: 0.01%-0.1%, manganese: 0.1%- 0.5%, zinc: 0.1%‑0.5%, rare earth: 0.05%‑0.5%, and the balance is aluminum. The preparation method includes seven steps of alloy smelting, vacuum refining, ingot modification, ingot quenching and tempering, extrusion blanking, rolling forming and aging treatment. The aluminum alloy material involved in the present invention has good rigidity and plastic toughness, and the density is only 2.3g / cm 3 , is the aluminum alloy structural material with the lowest density at present, and can achieve a weight reduction effect of more than 20% by replacing traditional aluminum alloys, and has broad application prospects in aerospace and high-end civil fields where the demand for lightweight is urgent.

Description

technical field [0001] The invention relates to an ultra-low-density aluminum-lithium alloy and a preparation method thereof, belonging to the technical field of aluminum alloys. Background technique [0002] Aluminum-lithium alloy is a light-weight, high-strength and corrosion-resistant metal structure material. For every 1% lithium added to the alloy, the density will decrease by 3%, which can increase the elastic modulus of the alloy while reducing the density of the alloy. It is used in aviation and aerospace fields. There are very broad application prospects. The use of aluminum-lithium alloys instead of conventional high-strength aluminum alloys can reduce the structural mass by 10%-20%, increase the elastic modulus by 6%, and increase the stiffness by 15%-20%. It is considered to be the most ideal structural material for aerospace. [0003] However, it is difficult to achieve a good match between the high strength and toughness and low density of aluminum-lithium all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/06C22C1/03C22C1/06C22F1/047
CPCC22C21/06C22C1/026C22C1/03C22C1/06C22F1/047
Inventor 刘志鹏肖阳马凯杰刘振杰解海涛刘金学祁登科
Owner 郑州轻研合金科技有限公司
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