Study On Mechanical Behavior And Microstructure Of 5182 Aluminum Alloy For

5182 aluminum alloy widely used in the manufacture of the automobile body panel and can cover material because of its corrosion resistance, high strength and good process ability. Cans industry started relatively late in China, and its production level represent the whole technical level of aluminum processing industry. In recent years, due to the development of the economy, the cans of production increased year by year in our country. In this paper, the relationship between thermal processing, heat treatment technology and performance, organization of 5182 alloy were studied, the use of alloy plate under extreme temperature performance were discussed. The influence of different hot rolling parameters on the microstructure and mechanical properties were studied through simulation testing machine. The manufacture mechanical properties and deep drawing performance after baking is studied by using universal testing machine and cup drawing machine. the different direction and state of the alloy plate in the change of the mechanical properties of high and low temperature environment were discussed with the help of the universal testing machine and matching of high and low temperature test chamber. By means of OM, SEM and TEM analysis technique, observation and took the microstructure of the alloy under test schemes, the conclusion is as follows:High temperature hot compression simulation experiment show that the rheological curve peak stress and dislocation density have the same change trend,under the same deformation temperature, increases with the increase of strain rate and,under the same strain rate, decreases with the increase of deformation temperature. As the strain rate changes from low to high level, the rheological curves show the hardening and softening equilibrium state, the state of strain hardening is dominant and the dynamic softening state which dynamic recrystallization plays a main role, respectively. Under low strain rate, fibrous tissue are elongated in the direction of the deformation, along with the deformation temperature rise, grain boundary chances into a zigzag, dynamic recovery is more intense, when strain rate reach 10 s-1, the dynamic recrystallization happens, and with the deformation temperature rise,ecrystallization volume fraction is larger. After low temperature and low strain rate deformation, the size of crystal alloy is small, cell wall is not clear, the dislocation density is larger, after high temperature and high strain rate deformation, the axis of the crystal was found, the crystal size is larger, grain boundary clear, dislocation density issmall, this grain may grow up to become recrystallization grain in the process of hot deformation.Baking test showed that after high temperature and short time baking, tensile strength and yield strength is higher, cup drawing value is higher, after low temperature and long time baking, tensile strength and yield strength is lower, cup drawing value is lower, its deep drawing property is better, after multiple and low temperature baking,the specimen has the highest yield strength in all scheme, tensile strength and cup drawing value close to high temperature and short time baking. Tensile strength and yield strength contrast value and the absolute value of lugs parameters are proportional to ear rate. After high temperature, short time and low temperature, multiple baking system have the higher ear rates, after low temperature and long time baking, ear rate is low, and the anisotropy is the lowest at this time. In all the scheme, rolling and transverse have the higher tensile strength and yield strength contrast value, lugs parameters are all negative value, this is consistent with the results of 45 ° to form four ears in erichsen test.High and low temperature test of alloy sheet show that: as the change of deformation temperature, mechanical properties of all schemes have the same trend. At room temperature as a start point, with temperature drop, tensile strength and yield strength increases gradually, elongation also improve slightly, as temperatures rise,tensile strength and yield strength decrease rapidly, elongation increased obviously.Anisotropy index relatively less volatile during-100~150 ℃, and rising rapidly during200~250 ℃ because of severe dynamic recovery and large rotary angle of grain under the action of external force, anisotropy index reached its lowest point at 300 ℃ on account of dynamic recrystallization. H19 and H26 state alloy deformed at – 150 ℃and room temperature are fiber grain, when deformation temperature reaches 300 ℃,the dynamic recrystallization occurred. The metallographic of O state is small equiaxed grain and has no obvious changes in all deformation temperature. Compared with room temperature, the fracture at-150 ℃ contain smaller and lighter dimples, but these dimples have a wide distribution and more quantity, some layered cross section is evident, fracture at 300 ℃ has deep and large dimples, its fracture is obviously thinning due to deformation.