Diffusion bonding of nickel-based superalloy GH4099 with pure nickel interlayer

The nickel-based superalloy GH4099 was diffusion-bonded with 2–10 μm thick pure nickel interlayer. The joint microstructure was characterized by scanning electron microscopy, electron probe micro-analyzer and electron backscattered diffraction; the joint mechanical properties were evaluated by nanoindentation, tensile and Charpy impact tests. It was observed that with the reduction in interlayer thickness, element distribution and hardness...