Ultra-light high-modulus high-strength casting aluminum-lithium matrix composite and preparation method thereof

A composite material and casting aluminum technology, which is applied in the field of metal materials and metallurgy, can solve problems such as poor wettability, achieve the effects of reducing hydrogen absorption and oxidation, obvious refinement effect, and cost reduction

Active Publication Date: 2018-12-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the main disadvantages that need to be overcome include the interface reaction between the particles and the matrix and the poor wettability between the particles and the matrix caused by the surface contamination of the added particles.

Method used

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  • Ultra-light high-modulus high-strength casting aluminum-lithium matrix composite and preparation method thereof
  • Ultra-light high-modulus high-strength casting aluminum-lithium matrix composite and preparation method thereof
  • Ultra-light high-modulus high-strength casting aluminum-lithium matrix composite and preparation method thereof

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Embodiment 1

[0037] This embodiment relates to an ultra-light, high-modulus, high-strength cast aluminum-lithium-based composite material and a preparation method thereof. The preparation method is specifically:

[0038] Firstly, TiB was prepared by in situ authigenic molten salt reaction 2 / Al base material, the specific steps are as follows: pure aluminum as the base material, NaBF 4 and Na 2 TiF 6 As a reaction mixture salt supplemented with Na 3 AlF 6 、LiF 3 , LiCl 3 As a reaction auxiliary agent, the ratio is 2:1:1, the total amount is 10% of the reaction mixed salt, the reaction auxiliary agent is added at a temperature of 760 ° C, and the reaction time is 30 minutes; rotating and blowing argon for stirring, and the rotor speed is 300r / min, the flow rate of argon gas is 10L / min; the intensity of the pulsed magnetic field is controlled at 1.5T, and the intensity of the high-energy ultrasonic field is controlled at 200W / m 2 , to prepare TiB 2 In situ reinforcement of pure alu...

Embodiment 2

[0049] This embodiment relates to an ultra-light, high-modulus, high-strength cast aluminum-lithium-based composite material and a preparation method thereof. The preparation method is specifically:

[0050] Firstly, TiB was prepared by in situ authigenic molten salt reaction 2 / Al base metal, preheat base metal, pure aluminum, Al-Mg master alloy, Al-Cu master alloy to about 200℃, and then TiB 2 / Al base metal and pure aluminum are melted in a molybdenum crucible. After the aluminum ingot is melted, add the Al-Cu master alloy at 750-760 °C, wait for the temperature of the aluminum liquid to rise to 750-760 °C, then add the Al-Mg master alloy into the aluminum liquid, and keep it warm for 5 minutes after the temperature is stable. After the heat preservation is over, add Al-Zr, Al-Sc, and Al-Cd master alloys in sequence at 750-760 °C, stir evenly after they are completely melted, and sprinkle the covering agent (3:1=LiCl:LiF) on the surface of the melt . Subsequently, the A...

Embodiment 3

[0059] This embodiment relates to an ultra-light, high-modulus, high-strength cast aluminum-lithium-based composite material and a preparation method thereof. The preparation method is specifically:

[0060] Firstly, TiB was prepared by in situ authigenic molten salt reaction 2 / Al base metal, preheat base metal, pure aluminum, Al-Mg master alloy, Al-Cu master alloy to about 200℃, and then TiB 2 / Al base metal and pure aluminum are melted in a molybdenum crucible. After the aluminum ingot is melted, add the Al-Cu master alloy at 750-760 °C, wait for the temperature of the aluminum liquid to rise to 750-760 °C, then add the Al-Mg master alloy into the aluminum liquid, and keep it warm for 5 minutes after the temperature is stable. After the heat preservation is over, add Al-Zr, Al-Sc, and Al-Cd master alloys in sequence at 750-760 °C, stir evenly after they are completely melted, and sprinkle the covering agent (3:1=LiCl:LiF) on the surface of the melt . Subsequently, the A...

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Abstract

The invention provides an ultra-light high-modulus high-strength casting aluminum-lithium matrix composite and a preparation method thereof. The aluminum-lithium matrix composite comprises a matrix alloy and a strengthening phase, the matrix alloy comprises the following elements of, by mass, 2.5%-3.5% of Li, 1%-2.5 % of Cu, 0.4%-0.5% Mg, 0.15%-0.2% of Sc, 0.15%-0.2% Zr, 0-0.2% of Cd, less than 0.2% of the total content of impurity elements and the balance Al; and the strengthening phase is TiB2. The preparation method comprises the steps that Ti B2/Al base metal alloy is prepared by using in-situ synthesized reaction; and then the TiB2/Al base metal alloy, pure aluminum and Al-Cu, Al-Li and other intermediate alloys are smelted to obtain a composite, and after specific solid solution andaging treatment are carried out, the ultra-light high-modulus high-strength casting aluminum-lithium matrix composite is obtained. The ultra-light high-modulus high-strength casting aluminum-lithium matrix composite has higher strength and elastic modulus and lower density, and has lower cost meanwhile.

Description

technical field [0001] The invention relates to the field of metal materials and metallurgy, in particular to an ultra-light, high-modulus, high-strength cast aluminum-lithium-based composite material and a preparation method thereof. Background technique [0002] The rapid development of the aerospace field has put forward higher requirements for the specific strength, specific stiffness and damage tolerance of materials. Further reducing the structural quality of aerospace products and improving their comprehensive mechanical properties have become major issues in this field. One such ideal material is: aluminum-lithium alloy. As the lightest metal element in nature, lithium has a density of only 0.53g / cm 3 , which is only 1 / 5 of aluminum; therefore, lithium element has become the most effective metal element to reduce the weight of aluminum alloy components. Studies have shown that every 1%wt.% lithium added to aluminum alloy can reduce the alloy density by about 3%, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C32/00C22C1/10C22F1/04C22C1/06
CPCC22C1/06C22C1/1036C22C21/00C22C32/0073C22F1/04
Inventor 吴量李险峰陈东周聪马乃恒王浩伟
Owner SHANGHAI JIAO TONG UNIV
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