In view of the difficulty of rapid and accurate test of bonding interface strength in the diffusion bonding process of sheet components

a test scheme for the normal bonding strength of diffusion bonding interface for sheet is proposed in this study. Specimens with different diffusion-bonding qualities are obtained through single-factor experiment of diffusion bonding of TC4 alloy. The test results show that interface bonding strength of TC4 alloy is positively correlated with the bonding rate. The fracture analysis demonstrates that with the increase of bonding rate

the fracture surface transforms from flat to conical and from axial dimple to shear dimple

which proves the equivalence between the proposed method and metallographic evaluation. The proposed method complements the evaluation system of diffusion bonding quality and can be used to directly characterize the mechanical properties of the wide-range diffusion bonding interfaces.