The Relationship between Microstructure and Fracture Behavior of TiAl/TiAlNb SPDB Joint with High Temperature Titanium Alloy Interlayers.

In this paper, spark plasma diffusion bonding technology was employed to join TiAl and TiAlNb with high temperature titanium alloy interlayer at 950 °C/10kN/60 min, then following furnace cooling at cooling rate up to 100 °C/min. After welding, the joint was aging heat-treated at 800 °C for 24 h. The microstructure and the elements diffusion of the TiAl/TiAlNb joint was analyzed by field emission scanning electron microscopy (FESEM) with EDS.