Microstructure and mechanical properties of Monel alloy copper explosive clad interface

The Monel alloy copper bimetal clad rod was produced with the explosive cladding technique.The microstructures and mechanical properties of the bonding interfaces were analyzed by means of optical microscope, scanning electron microscopy, energy spectrum analysis and shearing separate tests.The results showed that the smooth bonding interface was transformed to a wavy bonding interface as the explosive ratios increased.Deformation twins were observed in the grains of the copper matrix, whose amount increased with the increasing of the explosive ratio.There were a certain amount of molten zones in the interface and fine columnar grains existed in this molten zone.EDS analyses indicated that diffusion did not take place between bonding interfaces, however, diffusion was observed after annealing.The shearing fracture did't take place in the bond interface but in the copper plates.