Basic characteristics of aluminum alloy for aerospace

The main characteristics of aluminum alloy for aerospace are: large-scale and integral, thin-walled and lightweight, precision of cross-section size and shape and position tolerance, homogeneity and quality of microstructure. According to the different conditions and parts of the aircraft, aerospace aluminum alloy for sale is mainly high-strength aluminum alloys, heat-resistant aluminum alloys and corrosion-resistant aluminum alloys. High-strength aluminum alloy is mainly used in aircraft fuselage parts, engine compartments, seats, control systems, etc., and is the most widely used.

The biggest feature of aviation aluminum alloy and aluminum alloy for aerospace is that it can improve its strength by deformation heat treatment. Deformation heat treatment is a comprehensive process that combines the deformation strengthening of plastic deformation with the phase change strengthening during heat treatment to unify the forming process and forming performance. During the plastic deformation process of aviation aluminum alloy, the density of defects inside the crystal increases, and these crystal defects will cause changes in the microstructure inside the material. In the process of plastic deformation of aviation aluminum alloy, dynamic recovery, dynamic recrystallization, subdynamic crystallization, static recrystallization, static recovery and other crystal structure changes will occur. These crystal structure changes, if properly controlled, can significantly improve the mechanical properties of the material and enhance the service life of the material.

Aviation aluminum alloys are generally strengthened by precipitating dispersed phases in supersaturated solid solutions. The general precipitation sequence is: partial region (or GP region) ~ transition phase (metastable phase) ~ equilibrium phase. In the process of deformation heat treatment, deformation induces precipitation, precipitation affects deformation, deformation and precipitation affect each other, and dynamically affect the properties of materials.

The precipitation strengthening process of deformation heat treatment is greatly affected by temperature. Deformation heat treatment of can be divided into high temperature deformation heat treatment and low temperature deformation heat treatment. The basic process of low-temperature deformation heat treatment is: aviation aluminum alloy quenching, room temperature cold deformation, aging heat treatment. After this treatment, the strength of aviation aluminum alloy is greatly improved, but the plasticity is reduced. The heat treatment process of high temperature deformation is: quenching, high temperature deformation, aging. After high temperature deformation heat treatment, the strength of the material is high, the plasticity and toughness are improved, and the heat resistance strength of the alloy will also be improved.