Study on the Mechanism of Rolling-Bonding of Aluminum Cladding Magnesium Alloy

Though magnesium alloys are attractive materials for their high specific strength,high stiffness,excellent machinability and super damping capacity,development of magnesium alloys is restricted for their poor formability and low corrosion resistance.In order to resolve these problems,aluminum cladding magnesium alloys were fabricated by rolling-bonding method,the mechanism of rolling-bonding has been studied and the effects of various parameters in the processes on bonding strength have been analyzed.The results show that the mechanism of rolling-bonding is "crack" mechanism.Good bonding can be achieved when deformation rate is larger than a critical value.Annealing has great effect on bonding strength.The diffusion of atoms of aluminum and magnesium during the process of annealing can increase the bonding strength between aluminum and magnesium,but immediate phase decreases the bonding strength sharply.