2519 aluminum alloy is a new type of armored aluminum alloy jointly developed by Alcoa and USARmy. It belongs to 2×× and can be heat-strengthened and strengthened in 1985. ) Registration, its components (mass%): Si0.25, Fe0.30, Cu5.3-6.4, Mn0.10-0.50, Mg0.05-0.40, Zn0.10, Ti0.02-0.10, V0.05- 0.15, Zr 0.10-0.25, the rest aluminum.
The alloy is characterized by its higher ballistic resistance than conventional alloys and no stress corrosion cracking susceptibility. The latter inhibits the application of Al-Zn-Mg in weapons and combat vehicles. . Alloy 2519 can replace 5×&×& alloys as an alternative armor material, it also has satisfactory weldability, available armored materials for combat vehicles, aircraft, and other commercial applications.
2519 alloy is a modification of the high weldability of 2219 alloy (its composition, mass%: Si0.20, Fe0.30, Cu5.8-6.8, Mn0.20-0.40, Ti0.10-0.20, V0.05 -0.15, Zr0.10-2.5, Mg0.02, remaining aluminum), reduced copper content, and added a small amount of magnesium. In general, lowering the copper content slightly increases the alloy's thermal cracking sensitivity. Although adding magnesium helps increase the strength, it increases the thermal cracking sensitivity during welding.
The key to promoting the application of this alloy is to formulate a reasonable process for mass production of semi-finished products with good plate shape and comprehensive properties, especially the hot rolling process.
In particular, the thermal deformation of the 2519 alloy is not only higher than its activation energy (167-81 KJ/mol) than that of pure aluminum (142 KJ/mol), but also higher than that of most industrial aluminum alloys because it contains copper. , magnesium and other alloying elements.
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