Damage-resistant aluminum-lithium alloy and preparation method thereof

Abstract

The invention relates to a novel damage-resistant aluminum-lithium alloy and a preparation method thereof. The alloy comprises the following components in percentage by weight: 2.8 to 4.0 percent of Cu, 0.8 to 1.9 percent of Li, 0.20 to 0.60 percent of Mn, 0.20 to 0.80 percent of Zn, 0.04 to 0.20 percent of Zr, 0.20 to 0.80 percent of Mg, 0.1 to 0.7 percent of Ag, less than or equal to 0.10 percent of Si, less than or equal to 0.10 percent of Fe, less than or equal to 0.12 percent of Ti, less than or equal to 0.15 percent of other impurities, and the balance of Al, wherein a single impurity accounts for less than or equal to 0.05 percent of the weight of the alloy; and one to five of alloy elements Mn, Zn, Mg, Ag and Zr can be selectively added. The preparation method comprises the following steps of: mixing the alloy elements, melting raw materials, performing furnace refining, standing, and pouring to form alloy ingots with required specifications. The alloy ingots are formed by hot extrusion, hot rolling and cold rolling after being optimized and homogenized and are used for machined parts after being subjected to heat treatment by an optimal process. The novel damage-resistant aluminum-lithium alloy material of the invention has a uniform microstructure and stable performance and is suitable for manufacturing sheets. Products made of the material can be used for structural elements in the fields such as aerospace, nuclear industry, transportation, sports goods, weapons and the like.

Description

technical field [0001] The invention relates to a damage-resistant aluminum-lithium alloy and a preparation method thereof, belonging to the field of metal material engineering. Background technique [0002] In recent years, with the improvement of aluminum metallurgical equipment technology and basic metallurgical technology, aluminum-lithium alloys have undergone three generations of development, and the metallurgical design principles of aluminum-lithium alloys have developed into: moderate strength, slightly lower density, and low anisotropy , and give full play to its advantages of rigidity and damage resistance. The pursuit of lower process costs in production shows that its production process is closer to that of ordinary aluminum alloys. [0003] With the intensification of competition in the aviation industry, especially in the civil large-scale aircraft manufacturing industry, aircraft manufacturing companies such as Boeing, Airbus, Bombardier, and COMAC have take...

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Problems solved by technology

[0007] The anisotropy of Al-Li alloys comes from the coplanar slip and texture caused by the δ′ phase, and the addition of Zr can inhibit the coplanar slip of the δ′ phase and have a good toughening effect on the alloy, but The anisotropy of the alloy cannot be greatly reduced

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