In this work

the research progress on diffusion bonding of titanium alloys and fatigue crack growth (FCG) behavior of their laminates are briefly reviewed. Furthermore

the microstructural evolution and FCG characteristics at the interfaces of titanium alloys subjected to diffusion bonding are summarized. Firstly

the application background and advantages of superplastic forming/diffusion bonding technology are outlined

as well as some auxiliary technologies to improve the diffusion bonding interface quality of titanium alloys

such as the interlayer addition

thermohydrogen treatment

pulse current heating

and surface modification. The microstructures and mechanical properties of the bonded interfaces are shown based on the diffusion bonding of titanium alloys and titanium alloys with other alloys. The strong dependence of microstructural evolution on the alloy elements and interdiffusion ability of elements at the bonded interfaces is clarified. Diffusion bonding process can be used to fabricate the laminates of the same and different alloys

and the shape and distribution of the bonded and unbonded zones at the interfaces can be flexibly controlled. Finally

the diffusion bonding laminates with the same or different titanium alloys can be used to reduce the FCG rate. Therefore

the fatigue damage tolerance of titanium alloy components is optimized.