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

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...

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