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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session

MM 18.13: Poster

Monday, March 31, 2014, 18:00–20:00, P4

Phase-field simulation of interdiffusion-limited coarsening in Ni-base superalloys under applied loads — •Leslie Mushongera, Micheal Fleck, Julia Kundin, and Heike Emmerich — University of Bayreuth

We study microstructure evolution in Ni-base superalloys under a uniaxial strain applied along a cubic axis. It is observed that the gamma prime precipitates age from quasi-cuboids to rafts aligned along the <100> direction. It is observed that slow diffusing elements particularly, the refractory element Re, play a major role in reducing the rate of rafting. Re additions substantially reduce the rate of rafting by enforcing some gamma prime precipitates to keep the energy minimizing quasi-cuboidal configuration while on the other hand, hindering the elongation of rafts. In addition, a numerical technique to characterize the coarsening kinetics of microstructures with self-dissimilar gamma prime precipitates is presented.