Research On The Superplastic Differential Temperature Drawing Of Aluminum Alloy

Having medium mechanical behavior, high strength, good corrosion resistance, and very good welding property, AA5083 of superplastic aluminium alloy is widely used in the department of Aeronautics, Astronautics and ship.In this paper, the superplastic differential temperature drawing of AA5083aluminum alloy is performed. Deep drawing of sheet is made by the superplastic temperature, the certain strain rate of the flange zone of a blank was kept, and the wall of die was cooled. The deep drawability of the sheet was improved markedly. Uniaxial tensile test of AA5083 aluminum alloy were carried out to research mechanical behavior at temperatures between 350℃and 535℃over the initial strain rate from 10^-5s^-1 to 10^-2s^-1. It was found that the best temperature is 525℃, the best strain rate is 1.97×10^-4s^-1, and the maximum elongation is 470%. Both constant strain rate and velocity jump test were carried out to measure the strain rate sensitivity m.The biggest m value is 0.5 and 0.52, and we obtained an elastic-viscoplastic constitutive modeling under different temperature.The differential temperature superplastic drawing realized to impove deep drawability of the sheet by controlling temperature at punch bottom and die flange. With research on deformation characteristics of AA5083 superplastic aluminum alloy, we defined the material property under different temperature by establishing temperature distribution when punch touched sheet, and then the superplastic differential temperature drawing of AA5083 aluminum alloy was simulated by using MSC.Marc FEM software. FEM simulation result was indicated: thickness distribution of the superplastic differential temperature drawing was more uniform than superplastic drawing, and deforming temperature, the velocity of drawing and friction were effect on FEM simulation result.Including differential temperature at punch bottom and die flange, the velocity of punch and deforming temperature were evry important factors in the experiment of superplastic differential temperature drawing. Under best temperature, we calculated the best velocity of drawing. In the end, the part of airbus was fabricated with the method of superplastic differential temperature drawing. FEM simulation result is coincident with experimental observations, and thickness distribution of the part is very uniform.