TRR 103: From Atoms to Turbine Blades - A Scientific Approach for Developing the Next Generation of Single Crystal Superalloys

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Single crystal Ni-base superalloys (SX) represent key materials for turbine blades in modern gas turbines for aero engines and power plants. International mobility and global energy supply rely on SX. Improvements in efficiency and emissions demand new concepts in the areas of (i) basic understanding of all aspects of alloy design and performance, (ii) continuous improvement and innovation of processing technologies, (iii) scale bridgiung characterization of nano-/microstructures and properties, (iv) scale bridging materials modelling and (v) efficient handling of research data. The research activities of SFB/TR 103 focus on two central questions: What is the role of large and small scale microstructural heterogeneities (large scale heterogeneity: dendrites and interdendritic regions, small scale heterogeneity: γ/γ’-microstructure)? How do alloy elements (especially: d-shell elements like Re, W, ..) affect microstructure, microstructural evolution and properties? It is important to understand how these parameters affect thermodynamic equilibria, the evolution of microstructure during processing and high temperature exposure and high temperature strength. Modern alloy design strives for better performance in terms of most efficient use of fossil resources. It must also respect the limited availability of strategic elements (e.g. less Re, more W, Mo and others). In addition to Ni-base superalloys, an effort is made to explore the high temperature properties of new Co-based single crystal super alloys with γ/γ’-microstructures. In SFB/Transregio 103, the Ruhr-Universität Bochum (RUB) and the Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) join forces and collaborate with the MPIE, Düsseldorf, the DLR, Köln and the FZ Jülich. Different areas of expertise, including materials science and engineering, solid state physics and chemistry, scale bridging materials modeling and processing and manufacturing technology are in close scientific contact. Research in the second third funding period of SFB-Transregio 103 will tackles open questions related to processing of superalloy single crystals, to the stability of microstructures at high temperatures and to elementary deformation and damage mechanisms. In the third funding period, four transfer projects help to transfer research results from academia into applications.