Microstructural evolution during transient liquid phase bonding of Inconel 738LC using AMS 4777 filler alloy

► TLP bonding of IN-738LC superalloy was performed using AMS 4777 filler alloy. ► Insufficient diffusion time resulted in the formation of eutectic product. ► Precipitation of B-rich particles was observed within the DAZ. ► The extent of isothermal solidification increased with increasing holding time. ► Homogenizing of joints resulted in the dissolution of DAZ intermetallics.