High-strength high-toughness aluminum lithium alloy and preparation method thereof

A high-toughness aluminum and lithium alloy technology, applied in the field of aluminum alloys, can solve the problems of low purity of alloy melt, reduce alloy plasticity, and unfavorable alloy plasticity, and achieve the effects of eliminating casting defects, improving plasticity and toughness, and reducing casting defects

Active Publication Date: 2018-08-21
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

Patent CN104451272 B lightweight high-strength cast aluminum-lithium alloy and its preparation method, using a lower Cu/Al ratio is not conducive to the strengthening phase Al 2 The formation of CuLi phase; it adopts the conventional casting method, adding flux during the casting process, the purity of the alloy melt is low, and the plasticity of the alloy is poor
Patent CN 104313421 B relates to a preparation method of an aluminum-lithium alloy ingot, adding a relatively high proportion of Ag elements, which great

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  • High-strength high-toughness aluminum lithium alloy and preparation method thereof
  • High-strength high-toughness aluminum lithium alloy and preparation method thereof

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Embodiment 1

[0033] A high-strength and high-toughness aluminum-lithium alloy, composed of the following components in mass percentage: Li: 2.1%, Cu: 3.8%, Mg: 0.2%, Co: 0.25%, Sr: 0.1%, Y: 0.12%, Zr: 0.09%, and the balance is Al; the mass ratio of Cu / Li is 1.8.

[0034] The preparation method of the above-mentioned high-strength and high-toughness aluminum-lithium alloy comprises the following steps:

[0035] (1) Dosing according to the mass percentage of each component in the alloy; preheat the prepared raw materials, and put them into the vacuum induction melting furnace, vacuumize until the vacuum degree reaches 1 Pa, and then introduce high-purity argon to the furnace pressure Reach 300 Pa, heat up to 850°C for melting, and obtain molten metal;

[0036] (2) The molten metal obtained in step (1) was refined in argon at 720°C for 12 minutes, and mechanical stirring was maintained during the argon refining; after standing at 730°C for 10 minutes, it was cast into a plate with a cross-se...

Embodiment 2

[0044] A high-strength and high-toughness aluminum-lithium alloy, composed of the following components in mass percentage: Li: 1.8%, Cu: 2.9%, Mg: 0.3%, Co: 0.20%, Sr: 0.18%, Y: 0.11%, Zr: 0.06%, the balance is Al; the mass ratio of Cu / Li is 1.6.

[0045] The preparation method of the above-mentioned high-strength and high-toughness aluminum-lithium alloy comprises the following steps:

[0046] (1) Dosing according to the mass percentage of each component in the alloy; preheat the prepared raw materials, and put them into the vacuum induction melting furnace, vacuumize until the vacuum degree reaches 0.1 Pa, and then introduce high-purity argon to the furnace pressure Reach 350 Pa, heat up to 820°C for melting to obtain molten metal;

[0047] (2) The molten metal obtained in step (1) was refined in argon at 710°C for 10 minutes, and mechanical stirring was maintained during the argon refining; after standing at 720°C for 8 minutes, it was cast into a plate with a cross-sectio...

Embodiment 3

[0054] A high-strength and high-toughness aluminum-lithium alloy, composed of the following components in mass percentage: Li: 1.6%, Cu: 3.2%, Mg: 0.5%, Co: 0.25%, Sr: 0.15%, Y: 0.12%, Zr: 0.10%, the balance is Al; wherein the mass ratio of Cu / Li is 2.0.

[0055] The preparation method of the above-mentioned high-strength and high-toughness aluminum-lithium alloy comprises the following steps:

[0056] (1) Dosing according to the mass percentage of each component in the alloy; preheat the prepared raw materials, and put them into the vacuum induction melting furnace, vacuumize until the vacuum degree reaches 10 Pa, and then introduce high-purity argon to the furnace pressure Reach 250 Pa, heat up to 830°C for melting, and obtain molten metal;

[0057] (2) Refining the molten metal obtained in step (1) at 730°C for 15 minutes with argon gas, maintaining mechanical agitation during argon refining; then standing at 720°C for 10 minutes, and casting it into a plate with a cross-s...

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Abstract

The invention discloses a high-strength high-toughness aluminum lithium alloy. The high-strength high-toughness aluminum lithium alloy is composed of the following ingredients of, in percentage by mass, 1.6-2.3% of lithium, 2.9-3.8% of copper, 0.15-0.60% of magnesium, 0.18-0.35% of cobalt, 0.05-0.25% of strontium, 0.09-0.18% of yttrium, 0.06-0.12% of zirconium and the balance aluminum, wherein themass ratio of copper to lithium (Cu/Li) is controlled to be 1.3-2.0. The invention further discloses a preparation method for the high-strength high-toughness aluminum lithium alloy, and the preparation method for the high-strength high-toughness aluminum lithium alloy comprises the following steps of material confecting, smelting, casting, homogenizing, hot rolling, annealing, cold rolling, solid dissolving and aging. According to the high-strength high-toughness aluminum lithium alloy and the preparation method for the high-strength high-toughness aluminum lithium alloy, by means of composite microalloying and vacuum solvent-free casting, high-quality casting ingots are obtained, and by means of subsequent large deformation and the solid dissolving and aging process, the aluminum lithium alloy with good match of strength and plasticity toughness is obtained.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a high-strength and high-toughness aluminum-lithium alloy and a preparation method thereof. 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% to 20%, increase the elastic modulus by 6%, and increase the stiffness by 15% to 20%. It is considered to be the most ideal structural material for aerospace. [0003] Lithium is the most active metal element in chemical properties. Adding lithium to aluminum ...

Claims

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Application Information

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IPC IPC(8): C22C21/16C22C1/02C22F1/057C22F1/02
CPCC22C1/026C22C21/16C22F1/02C22F1/057
Inventor 刘志鹏肖阳马凯杰解海涛郭晓光王松森李建岭王军武程家尧
Owner 郑州轻研合金科技有限公司
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