Interface Microstructure and Bonding Strength of Fe/Al Double Metal Composite Pipe by Explosive Method

In order to study the composite interface bonding status of the Fe/Al double metal pipe prepared by explosive method, transpression tests were performed to test the interface bonding strength. Scanning electric microscopy and energy disperse spectroscopy were used to charaterize the interface morphology and element distribution.The effect of the annealing was also discussed. It is found that wavy welding of Fe and Al could be realized in the middle of the composite pipe, the transition layer was narrow. No obvious intermetallic compounds were observed in the interface. The interfacial bonding strength was higher than the Al substrate shear strength. The distribution of the elements in the interface could be improved by annealing process. After annealing below 400 ℃ the interfacial bonding strength could not obviously decrease.