Annealing Microstructure Evolution and Mechanical Properties of the 5083Al/ 1060Al/TA1/Ni/ SUS304 Five- Layer Explosive Composite Plate

In order to improve the quality of explosive welding of 5083Al and 304 stainless steel and improve the thermal insulation effect, 1060Al, TA1 and Ni were used as interlayer materials to prepare a five- layer explosive composite plate with thermal conductivity gradient. In order to eliminate the residual stress after explosive welding and reduce defects such as adiabatic shear bands and micro-cracks, the five-layer explosive composite plate was annealed at 550 degrees C for 60 min. The effect of annealing on its microstructure evolution and mechanical properties was studied by SEM, EBSD and universal testing machine. The results show that the four welding interfaces of the five- layer explosive composite plate are all corrugated, and there are defects such as micro-cracks, pores, adiabatic shear bands and vortex areas at the interfaces. After annealing, the four welding interfaces are recrystallized to different degrees, and the defects such as microcracks and adiabatic shear bands are effectively improved. beta phase and Al-Ti intermetallics are increased in amount in the 5083Al/1060Al/TAl interfaces. On the basis of the original TiNi3 melting layer, a new TiNi melting layer and a new Ti2Ni melting layer appear in the TAl/ Ni interface. The tensile and shear strengths of the interface are decreased, but they are still far higher than the requirements of the corresponding national standards; the pull-off samples are fractured and separated at the 5083Al/1060Al interface.