Dissimilar brazing of Ti2AlNb-based alloy and Ni-based wrought superalloy (GH536) was studied using NiCrFeSiB filler metal.The Ti2AlNb/GH536 joints were analyzed by scanning electron microscope (SEM) equipped with an electron probe micro-analyzer (EPMA),X-ray diffraction (XRD) and transmission electron microscopy (rEM).The formation mechanism of interfacial microstructure and mechanical properties of Ti2AlNb/GH536 joints were studied.The results indicated that Ti2Ni(Al,Nb),AlNi2Ti and TiB2 reaction layers were formed in the joint adjacent to Ti2AlNb base metal.These layers resulted in high micro-hardness and the weak link of the joint.γsolid solution was formed through isothermal solidification and β1-Ni3Si phase precipitated in the γ solid solution during cooling process.Ni3B,β1-Ni3Si and CrB phases appeared in the centre of the joint.Blocky and needle-like borides formed within the diffusion affected zone of GH536 base alloy.The maximum tensile strength of Ti2AlNb/GH536 joints reached 425 MPa at room temperature and the strength value of 373 MPa was maintained at 923 K.