| 5083 aluminum alloy has been widely used in industry due to its anti-corrosion property. In recent years, Super Plastic Forming (SPF), Diffusion Bonding (DB) and its composites (SPF/DB) are the most advanced technologies in sheet metal forming and joining. The number of aircraft parts can be reduced by using SPF/DB technology. However, diffusion bonding of Al alloys is difficult because of the tenacious surface oxide which inhibits atom diffusion. Hence, to achieve a sound bond it is necessary to remove the surface oxide at least partially, or to disrupt its continuity. So how to overcome the obstacle becomes a very important topic.In this paper, the experiments of diffusion bonding technology of 5083 aluminum alloy are carried out. The specimens are daubed with protector to isolate surface from air, after their chemical etching and prior to bonding, and then are placed in a vacuum environment for diffusion bonding under different temperature, time and pressure conditions. The feasibility of diffusion bonding of 5083 Al alloy under chosen parameters is investigated. Via experimentation of shear strength and metallographic, the effects of different parameters on the bonding quality have been investigated. In addition, the results of metallographic observations show that bonding and recrystallization have occurred across the bond line. The optimum bonding conditions involve temperature of 540℃, pressure of 3.5MPa and time of 2.5 hours. Under optimum conditions, the bond lines are disappeared from bonded specimens and the bond specific shear strength achieves maximum, about 148.5MPa, 86.3% of raw materials. |
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