Bonding interface characteristic and shear strength of diffusion bonded Ti-17 titanium alloy
(School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China)
Abstract: The bonding interface characteristic and shear strength of diffusion bonded Ti-17 titanium alloy at different bonding time were investigated. The results show that the average size of voids decreases while the amount of voids decreases after increasing to the maximum value with the increasing bonding time. The irregular void with a scraggly edge tends to an ellipse void with smooth surface and then changes to a tiny void with round shape. The grains across bonding interface occur at bonding time of 60 min. The shear strength of bond increases with increasing bonding time, and the highest shear strength of bond is 887.4 MPa at 60 min. The contribution of plastic deformation on the void closure and the increase of shear strength is significant even though the action time of plastic deformation is short.
Key words: Ti-17 titanium alloy; diffusion bonding; bonding interface; void; shear strength