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Low-cost and high-toughness aluminum lithium alloy

A technology of aluminum-lithium alloy and deformed aluminum alloy, which is applied in the composition field of low-cost lithium-containing aluminum alloy, can solve problems such as low strength, and achieve the effect of improving stress corrosion resistance

Pending Publication Date: 2019-12-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this alloy reduces the use of expensive silver, its strength is lower than 7075 alloy and cannot be used to replace 7075 parts

Method used

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  • Low-cost and high-toughness aluminum lithium alloy
  • Low-cost and high-toughness aluminum lithium alloy
  • Low-cost and high-toughness aluminum lithium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Induction melting:

[0055] The chemical composition of the alloy without Li, Ti and Zr is weighed according to the mass percentage, then put into the induction melting furnace, and the raw materials are melted by electric heating. Wrap the lithium with aluminum foil and put it into another argon-protected induction melting furnace, and heat it to 740°C to melt after power on.

[0056] (2) Refining degassing:

[0057] The lithium-free aluminum alloy and pure lithium are diverted to the dehydrogenation chamber under the atmosphere of argon protection, and the argon gas is introduced for degassing. At the same time, Ti and Zr are added in the form of an intermediate titanium-boron refiner alloy, and heated While maintaining the temperature, the melt is filtered to remove slag.

[0058] (3) Semi-continuous casting:

[0059] The degassed, slag-removed, and fully stirred aluminum-lithium alloy solution is sent to a semi-continuous casting table for casting, and the ro...

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Abstract

The invention relates to a high-strength and low-cost deformed aluminum lithium alloy product containing no silver. The aluminum lithium alloy can be formed through casting or injection to extrude rods or profiles; and the rods or the profiles are applied to aerospace parts. The alloy comprises the following components: 3.5-4.0 weight% of Cu, 1.5-2.0 weight% of Li, 0.5-1.0 weight% of Mg, 0.5-1.0 weight% of Zn, Mn not more than 0.5 weight%, and 0.1-1.0 weight% of such elements as Ti, Zr, Cr, V and Ce. The contents of impurities are controlled as follows: the content of silicon not more than 0.15%, the content of iron not more than 0.15 weight%, and the content of other elements not more than 0.15 weight%. The alloy product has such advantages as low anisotropism and low processing sensitivity, and can be used for forming high-quality aluminum lithium alloy parts.

Description

technical field [0001] The invention relates to a low-cost lithium-containing aluminum alloy composition, which has excellent mechanical properties such as strength and toughness, and can be used to meet the needs of light-weight and high-strength structural parts for components in aerospace and other fields after preparing rods or profiles. Background technique [0002] In the field of aerospace, aluminum-lithium alloys are more and more widely used in the processing and manufacturing of core components due to their high specific strength, high elastic modulus, excellent fatigue and corrosion resistance, and easy processing. For example, every increase of 1% by weight of lithium reduces the density of aluminum by 3%, and increases the modulus of elasticity by more than 6%. Therefore, aluminum-lithium alloys have the potential to replace traditional 2024 and 7075 aluminum alloys. [0003] In order to realize the wide application of aluminum-lithium alloy in the aerospace fi...

Claims

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Application Information

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IPC IPC(8): C22C21/14C22C21/16C22C21/18C22F1/057C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/14C22C21/16C22C21/18C22F1/002C22F1/057
Inventor 王俊升
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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