As part of a short-term nuclear project, the CEA/LITEN is supporting the manufacturing activities of a titanium alloy steam generator by HIP (Hot Isostatic Pressing). Depending on its thermal and/or thermomechanical history, the alloy Ti64 presents phases in different proportions, chemical compositions and crystallographic structures.
How does diffusion welding take place between two different phases? Is there one that cross the interface preferentially and if yes, why? Which HIP parameters have a real influence? What starting microstructure allows optimal diffusion welding?
These are the questions that the thesis should answer.