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Diffusion bonding in the solid state between the zirconium alloy (Zircaloy-4) and AISI 304L stainless steel (304L SS) was studied at a temperature of 1,050 C under a dynamic pressure in a controlled atmosphere. We discussed the morphology of the interface formed by determining the distribution of the various chemical constituents as well as the location and the identification of the different phases nature formed through due to chemical exchange reactions that occurred by diffusion through the interface. Observations and chemical analysis were performed by environmental scanning electron microscope (ESEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The junction is composed of three distinct zones formed of a solid solution (FeCr)a rich in Cr as a homogeneous edging from steel side. The type phase Zr(Fe,Cr) 2 occupies the Zone II and phase Zr 2 (Fe,Ni) Zone III between them settled the eutectic Zr a -Zr(Fe,Cr) 2 . . The observations and analysis of the fracture surfaces obtained by impact testing showed a morphology of a brittle fracture by cleavage which is located at the interface. The microhardness filiation at the interface of both materials diffusion bonded is very heterogeneous.