Formation of defect phases via hydrogen exposure in nickel alloys (B08*)

• Subject Area: Thermodynamics and Kinetics as well as Properties of Phases and Microstructure of Materials
• Term: since 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 409476157

The degradation of nickel alloys via defect phases is investigated by means of correlative transmission electron microscopy and atomic probe tomography. For this purpose, a standardised evaluation is developed to detect the formation of nano-hydrides after hydrogen loading along dislocation lines. Furthermore, the contribution of elemental segregations to hydrogen diffusion and embrittlement is in our focus. The controlled incorporation of oxygen into such hydrogen-loaded systems serves to understand the underlying dissociation and diffusion phenomena.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 1394: Structural and Chemical Atomic Complexity: From Defect Phase Diagrams to Material Properties
• Applicant Institution: Rheinisch-Westfälische Technische Hochschule Aachen
• Project Heads: Dr.-Ing. Marcus Hans; Professor Dr.-Ing. Dierk Raabe