Abstract
This chapter investigates the effect of superplasticity (SP) on the solid-state weldebility in two-phase titanium alloys. The obtained data of fundamental investigation show that the acceleration of solid-state joint (SSJ) formation in SP state is attributed to the phenomenon revealed the successful experiments on solid-state bonding under SP conditions at 650ºC in submicrocrystalline Ti–6Al–4V titanium alloy are performed. It is established that combination of superplastic formation with subsequent diffusion bonding (SPF/DB) results in the occurrence of roughness and especially waviness on bonded surfaces. Their nature is explained by GBS development and they are favorable for providing superplastic deformation that is necessary for formation of a solid-state joint. On the basis of experimental results, the deformation models of SSJ formation at SPF/DB are suggested, which are founded on the GBS development at SP flow and, which allows to understand the cause of accelerated bonding of materials in SP state. The proposed models are based on the deformation nature of SSJ formation, and differ fundamentally from the traditional concepts of the mechanism of SSJ formation in solid state in which diffusion processes play a dominant role.
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