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Medium and high strength damage resistant aluminum lithium alloy material and preparation method and application thereof

An aluminum-lithium alloy, damage-resistant technology, applied in the field of preparation of new composition aluminum-lithium alloy materials, to achieve the effect of good toughness and plasticity, excellent processing formability, and high elastic modulus

Active Publication Date: 2019-05-24
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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  • Medium and high strength damage resistant aluminum lithium alloy material and preparation method and application thereof
  • Medium and high strength damage resistant aluminum lithium alloy material and preparation method and application thereof
  • Medium and high strength damage resistant aluminum lithium alloy material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0070] Refining: Refining and degassing the alloy melt, adding hexachloroethane at 2% of the total mass ...

Embodiment 2

[0078] The other operations and steps are the same as those in Example 1 of the preferred scheme, except that:

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

[0080] Solution aging: use salt bath solution, temperature 530℃, time 30 minutes, pre-deformation amount 3%, solution temperature is artificial aging treatment, single-stage aging, aging temperature is 155℃, aging time is 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 the same as those in Example 1 of the preferred scheme, except that:

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

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

[0086] Solution aging: use salt bath solution, temperature 530℃, time 30 minutes, pre-deformation amount 3%, solution temperature is artificial aging treatment, single-stage aging, aging temperature is 155℃, aging time is 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 a new-component aluminum-lithium alloy material. 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 affected by its low density, high specific strength and specific rigidity. Extensive attention in the fields of aviation and aerospace. [0003] In practical applications, it is very difficult to maintain the strength of the alloy while having excellent shaping and damage resistance. In order to solve this problem, the researchers improved some properties of the alloy by adding trace rare earth elements. The high melting point Al formed by adding the rare earth element erbium to the aluminum alloy is coherent with the aluminum matrix. 3 Th...

Claims

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Application Information

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Patent Type & Authority Applications(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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