Assemblage par soudage diffusion de deux superalliages. Aspects diffusionnels et microstructuraux au niveau du joint

Abstract
Diffusion bonding is the prefered technique to join modern nickel based superalloys such as an aero-engine disk type material (processed by powder metallurgy to resist low cycle fatigue at moderate temperature) and a large grain cast or directionally solidified material resisting to creep. The microstructure in the vicinity of the joint is affected by diffusion, especially the γ' phase. In turn mechanical properties are affected by the transitions from one structure to the other.