Rolling Deformation Of Magnesium/Aluminum Explosive Welding Composite Plate

Magnesium alloy has the advantages of high specific strength, high specific stiffness, good damping performance and electromagnetic shielding performance, but its poor corrosion resistance is one of the reasons for the wide application of magnesium alloys. In contrast, the aluminum alloy surface is easy to generate a dense oxide film, corrosion resistance is better. Therefore, the surface covered with a layer of corrosion resistance of aluminum alloy, can improve its corrosion resistance and improve the processing performance of magnesium alloy, give full play to the performance of the two advantages. The first explosion welding of blank rolling method to prepare the magnesium / aluminum composite panel, can integrate the two processing methods, the advantages of and obtained is thin and with high strength magnesium aluminum composite panel, increase production efficiency and reduce costs, has a good prospect.In the magnesium / aluminum composite plate rolling process, due to the different nature of the two kinds of metal, when the rolling temperature is too low, the performance of two kinds of material difference is too large, is not conducive to the composite plate rolling interface uniform deformation; rolling temperature is too high will exacerbate composite plate element diffusion, generate large amount of hard and brittle intermetallic compounds, rolling is easy in the interface appear brittle crack, so reasonable rolling process parameters and not directly affect the composite board can successfully rolled and rolling quality. The finite element software ABAQUS on different aluminum / magnesium thickness ratio, temperature and reduction rate under the condition of composite plate hot rolling process was simulated, designed to save cost, to determine the appropriate process parameters of rolling, so as to provide guidance for the actual rolling.First, the explosion welding method of AZ31B/6061 composite was observed in the interface of the composite plate and wavy, and there is a small amount of melting block; magnesium side has a large number of adiabatic shear band generation; interface micro hardness value highest; from the interface more far, on both sides of the matrix hardness values decreased, but close to the value of the hardness of the aluminum plate on the upper side and the magnesium panel on the underside of the value is higher than the hardness of the base metal.Secondly, the composite plate at 300℃ to 400℃ heat preservation 5min conditions diffusion layer changes and magnesium side tissue changes were observed, identified at 350℃ heat preservation 5min can eliminate magnesium side of the adiabatic shear band, fully recrystallization, and can make the Mg and Al diffusion and strengthen the interface binding strength and avoid the formation of intermetallic compounds.Thirdly, by Gleeble-1500 testing machine compression test, 6061 aluminum alloy and magnesium alloy AZ31 B at strain rate 1s-1 and different temperatures really should stress- strain curve, and was imported to ABAQUS, the quality of different scaling coefficient under the condition of composite plate rolling process was simulated, obtained mass scaling coefficients for 6000 can not only significantly reduce the simulation time required, and the simulation precision is high.Finally, using the orthogonal experiment method aluminum/magnesium thickness ratio, pressure ratio and temperature of rolled composite plate affect the quality of primary and secondary relations; determine the optimal process parameters for the temperature of 350℃, the rolling reduction rate of 40%, Al / Mg thickness ratio 4:10 and the was simulated, and the analysis under the conditions of temperature field and stress field change.