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A medium-high-strength damage-resistant aluminum-lithium alloy material and its preparation method and application

An aluminum-lithium alloy, damage-resistant technology, applied in transportation and packaging, aircraft floors, aircraft accessories, etc., to achieve high specific strength and specific stiffness, excellent formability, and low density

Active Publication Date: 2020-07-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, there is no report on the addition of ruthenium as an alloying element in aluminum-lithium alloys

Method used

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  • A medium-high-strength damage-resistant aluminum-lithium alloy material and its preparation method and application
  • A medium-high-strength damage-resistant aluminum-lithium alloy material and its preparation method and application
  • A medium-high-strength damage-resistant aluminum-lithium alloy material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Batching smelting: The prepared alloy raw materials are batched according to the following mass ratio: lithium 0.9wt%, copper 4.0wt%, magnesium 0.4wt%, silver 0.3wt%, manganese 0.4wt%, titanium 0.09wt%, zirconium 0.1wt% %, 0.25wt% ruthenium, 0.1wt% erbium, and the balance is aluminum. After the pure aluminum ingot is completely melted at 800°C, add copper, manganese, silver, zirconium, ruthenium alloy elements or their intermediate alloys, stir fully for 4 minutes after melting; adjust to 750°C, and press the pure lithium wrapped in aluminum foil with a cup cover Put it into the aluminum alloy melt, keep it completely submerged for 4 minutes, and stir it fully after it is completely dissolved. During this process, argon gas should be introduced into the crucible for protection, and erbium, magnesium, titanium alloy elements or their intermediate alloys are added in sequence, and fully Stir for 4 minutes;

[0070] Refining: Refining and degassing the alloy melt, adding ...

Embodiment 2

[0078] Other operations and steps are consistent with Example 1 of the preferred solution, except that:

[0079] Batching smelting: The prepared alloy raw materials are batched according to the following mass ratio: lithium 1.2wt%, copper 4.0wt%, magnesium 0.4wt%, silver 0.3wt%, manganese 0.4wt%, titanium 0.09wt%, zirconium 0.1wt% %, 0.25wt% ruthenium, 0.1wt% erbium, and the balance is aluminum.

[0080] Solution aging: use salt bath for solution, temperature 530°C, time 30 minutes, pre-deformation amount 3%, solution temperature is artificial aging treatment, single-stage aging, aging temperature 155°C, aging time 40 hours.

[0081] The fatigue crack growth rate of the finished product is about 2.5×10 under the condition of R=0.1 -3 mm / cyc(ΔK p =30MPa·m 1 / 2 )

Embodiment 3

[0083] Other operations and steps are consistent with Example 1 of the preferred solution, except that:

[0084] Batching smelting: The prepared alloy raw materials are batched according to the following mass ratio: lithium 1.2wt%, copper 2.8wt%, magnesium 0.4wt%, silver 0.3wt%, manganese 0.4wt%, titanium 0.09wt%, zirconium 0.1wt% %, 0.25wt% ruthenium, 0.1wt% erbium, and the balance is aluminum.

[0085] Roll forming: billet rolling, hot rolling, and cold rolling into 2mm thin sheets on a rolling mill.

[0086] Solution aging: use salt bath for solution, temperature 530°C, time 30 minutes, pre-deformation amount 3%, solution temperature is artificial aging treatment, single-stage aging, aging temperature 155°C, aging time 40 hours.

[0087] The fatigue crack growth rate of the finished product is about 2.0×10 under the condition of R=0.1 -3 mm / cyc(ΔK p =30MPa·m 1 / 2 )

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Abstract

The invention discloses a medium and high strength damage resistant aluminum lithium alloy material and a preparation method of the medium and high strength damage resistant aluminum lithium alloy material. The medium and high strength damage resistant aluminum lithium alloy material is prepared from, by mass, 0.5-2% of lithium, 2-5% of copper, 0.2-0.7% of magnesium, 0.1-0.5% of silver, 0.1-0.6% of manganese, 0.01-0.15% of titanium, 0.08-0.15% of zirconium, 0.05-0.6% of ruthenium, 0-0.15% of erbium and the balance aluminum. Since a small amount of rare and precious metal element ruthenium withthe higher melt purifying ability is added into the alloy, the prepared aluminum lithium alloy has the high specific strength, high molding performance, high tenacity and excellent corrosion resistance, and the comprehensive mechanical properties of the alloy are greatly improved.

Description

technical field [0001] The invention relates to an aluminum-lithium alloy material and a preparation method thereof, in particular to a preparation method of an aluminum-lithium alloy material with a new composition. Background technique [0002] Lithium is the lightest metal element. Compared with the traditional 2xxx and 7xxx series aluminum alloys, the aluminum-lithium alloy formed by adding lithium as an alloying element to the aluminum alloy has been receiving attention because of its low density, high specific strength and specific stiffness. Extensive attention in aviation, aerospace and other fields. [0003] In practical applications, it is very difficult to achieve excellent plasticity and damage resistance while maintaining the strength of the alloy. In order to solve this problem, the researchers improved some properties of the alloy by adding a trace amount of rare earth elements, adding rare earth elements erbium to the aluminum alloy to form a dispersed distr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/16C22C1/02C22C1/03C22C1/06C22F1/057B64C1/18B64C3/26
Inventor 梁叔全梁强余琨
Owner CENT SOUTH UNIV
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