A kind of aluminum alloy section material and preparation method thereof

Abstract

The invention discloses an aluminum alloy section material for the long truss of the lower wall panel of a large aircraft wing and a preparation method thereof. Through the process research such as melt purification treatment, smelting casting, reverse extrusion, heat treatment strengthening, and elimination of internal stress of the aluminum material, Improve the strength, fatigue resistance, stress corrosion resistance and fracture toughness of aluminum alloy profiles, and its longitudinal mechanical properties: tensile strength not less than 538MPa, non-proportional elongation strength not less than 413MPa, elongation after fracture not less than 13.2%; transverse direction Mechanical properties: the tensile strength is not less than 492MPa, the non-proportional elongation strength is not less than 382MPa, the elongation after fracture is not less than 9.5%, and the minimum tensile strength is 8.5% higher in the longitudinal direction and 8.1% higher in the transverse direction than imported materials. The coarse-grained "recrystallized layer" on the surface is reduced, and its performance is superior to that of imported materials. It can meet the requirements of the strength, toughness, fatigue resistance, creep resistance, corrosion resistance and service life of the materials used for the lower wall panels and stringers of large aircraft wings. After testing, all the indicators meet or exceed the requirements of the AMS 4338A standard.

Description

Technical field

[0001] The present invention belongs to the field of aluminum alloy profile processing, and more particularly to aluminum alloy profiles for long-hail of large aircraft wings and methods of preparation thereof. Background technique

[0002] Modern civil aircraft continues to develop in large, high-speed, long life, high flight safety and low cost direction, the United States first through the control of ingredients on the 2024 alloy, has developed a new generation of high-strength, high loss injury to 2026 alloy, 2026 aluminum As the key structure material of large aircraft, alloy profiles has been used as the preferred aluminum alloy material for large pastel wings. In recent years, China's civil aviation manufacturing has developed rapidly, but due to the special conditions for the use of large aircraft wings, the requirements of material strength, toughness, anti-fatigue, antigen, corrosion resistance, and service life are extremely high, my country Aluminum al...

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