Aluminium en aw 5083 is a typical 5000 series aluminum alloy, is also a typical automotive sheet metal alloy, has excellent weldability, corrosion resistance, processing and forming properties and low temperature performance, in the Al-Mg alloy, it has a medium strength performance, welded joint strength can be equal to the annealed state of the base material, and has a reliable corrosion resistance, the mechanical properties of the en aw 5083 alloy are balanced as the temperature decreases, it is a good alloy for automobile coverings, especially suitable for commercial vehicles, various special vehicles, semi-trailers and other internal and external welded sheet metal structural properties.
Aluminum en aw 5083 alloy characteristics: not heat treatment to strengthen; to prevent “aging softening” and stable corrosion resistance, semi-finished products need to be stabilized; to prevent repeated annealing yield strength reduction, the final cold deformation should be > 50%.
Composition of the alu en aw 5083 alloy (mass %): Mg4.0~4.9, Mn0.4~1.0, Cr0.05~0.25, Si0.40, Fe0.40, Zn0.25, Ti0.15, other impurities single 0.05, total 0.15, Al rest. The main phase composition of the en aw 5083 aluminium alloy: α (Al), β (Al8Mg5), AlMn, Al7Cr, the possible impurity phases are Mg2Si, Al3Fe, Al3Ti, Al6 (Fe, Mn). Mg is the main strengthening element, producing solid solution strengthening and increasing the work hardening rate of the 5083 aluminum alloy. the solid solution degree of Mg in aluminum changes greatly with temperature, but the precipitation transition phase β’ (Al8Mg5) does not co-grid with the matrix, so there is no obvious precipitation hardening effect. the Al8Mg5 phase tends to precipitate slowly on the slip zone and grain boundaries, reducing the solid solution strengthening effect, and under corrosive conditions causes Intergranular corrosion and stress corrosion cracking, so after cold working should be stabilized annealing, in order to promote the uniform precipitation of β-phase in the grain and grain boundaries, stabilizing the mechanical properties and corrosion resistance of the alloy. Manganese and chromium improve the recrystallization temperature of the en aw 5083 alloy and have a complementary strengthening effect, titanium can refine the casting organization and weld organization, iron, silicon, zinc as impurities.
The density of aluminium en aw 5083 alloy 2.66g/cm3; melting temperature range 574℃~638℃; specific heat capacity 900J/(kg-k); thermal conductivity 120W/(m-k) at 20℃; body expansion coefficient 70×10-6m3/(m3-k) at 20℃; average linear expansion coefficient as follows:
-50℃~20℃ 22.3μm/(m-k)
20℃~100℃ 24.2μm/(m-k)
20℃~200℃ 25.0μm/(m-k)
20℃~300℃ 26.0μm/（m-k)
Aluminum en aw 5083 alloy has a positive elastic modulus of 71.0 GN/mm2 and a shear elastic modulus of 26.4 GN/mm2.
Electrical properties of en aw 5083 alloy at 20°C: conductivity (isoelectric product) 32% IACS; resistivity 54nΩ-m at 20°C; resistance temperature coefficient 0.1nΩ-m/K at 20°C; potential -0.86V for 0.1N glycogen electrode in aqueous solution containing 53g NaCl with 3g H2O3 per liter at 25°C.
The annealing temperature of aluminium en aw 5083 alloy sheet is 343℃ without holding, and the hot rolling temperature is 260℃~510℃.