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MM: Fachverband Metall- und Materialphysik

MM 15: Poster session I

MM 15.32: Poster

Monday, March 7, 2016, 18:00–20:00, Poster B3

Phase-Field Study of Anisotropic γ'-Coarsening Kinetics in Ni-Base Superalloys with Varying Re and Ru Contents — •Leslie Tafadzwa Mushongera, Micheal Fleck, Julia Kundin, Frank Querfurth, and Heike Emmerich — Material- und Prozesssimulation Universität Bayreuth, Universität Bayreuth, Germany

The coarsening kinetics of γ'-precipitates in single crystalline Ni-based superalloys is studied using phase-field simulations. At first, we discuss interdiffusion-limited γ'-coarsening in technologically relevant superalloys with the explicit inclusion of up to nine chemical components. The simulations show that an additional influence from the coherency strain leads to a substantially faster coarsening-evolution compared to the predictions from the LSW-theory. Second, we perform a virtual experiment to determine the influence of varying rhenium (Re) and ruthenium (Ru) additions on the temporal evolution of the γ-γ' microstructure under thermo-mechanical loads. We observe that a change in the Re content strongly alters the coarsening kinetics. On the contrary, it is found that Ru variations have no significant effect on the coarsening kinetics.