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METAL PROCESSING
ArticleName New aluminium-lithium alloy of Al – Cu – Mg – Li(Ag, Sc) system, intended for manufacturing of thin sheets and thin-walled sections
ArticleAuthor Ovsyannikov B. V.
ArticleAuthorData

JSC “Kamensk Uralsky Metallurgical Works”, Kamensk Uralsky, Russia:

B. V. Ovsyannikov, Chief Metallurgist

Abstract

Aluminium-lithium alloys have a unique combination of mechanical properties (low density, increased elastic modulus, and rather high strength properties), which make it possible to use these alloys as aircraft structural material and to improve aircraft performance characteristics. At the same time, aluminium-lithium alloys have a number of disadvantages: low plasticity on the verge of maximum strength, and low corrosion resistance, particularly in form of thin-walled semi-finished products. New aluminiumlithium alloy with increased plasticity and corrosion resistance was developed. It enables production of thin sheets and thin-walled sections, maintaining the strength and performance characteristics required for structural aircraft materials. Optimal chemical composition of the alloy allows to carry out almost complete transfer of copper into solid solution, which leads to significant decrease of volume ratio of gross intermetallic compounds of copper bearing phases and increasing of alloy plasticity. Additional alloying with alkaline-earth metals and limiting alkaline metals and gallium leads to more favorable conditions for shear deformation and increase of alloy plasticity. Introduction of vanadium, scandium and zirconium contributes to homogeneous fine-grained structure, providing the structural strengthening of semi-finished products and alloy parts, which makes it possible to achieve the required level of alloy strength properties. Introduction of argentum contributes to more equal distribution of strengthening phases in solid solution and more equal precipitation of dispersoids during ageing. As a result, both strength and corrosion alloy properties are increased.

keywords Al – Li alloys, phase composition, sections, sheets, mechanical properties, corrosion properties
References

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