isation 2

Contributed talk

Characterization and thermodynamic/kinetic analysis of nanoparticles in microstructures of single crystal superalloys

Gunther Eggeler, Ruhr-Universität Bochum, Bochum, Germany
Victoria Yardley, Ruhr-Universität Bochum, Bochum, Germany
Alireza Basir Parsa, Ruhr-Universität Bochum, Bochum , Germany
Ivan Povstugar, MPIE, Düsseldorf, Germany
Dierk Raabe, MPIE, Düsseldorf, Germany

Ni-base superalloys are known for their heat resistant γ / γ prime microstructures. Recently new tiny nano particles were discovered. Small (20 nm) spherical γ particles form in the large (0,5 µm) γ prime cubes, while small γ prime particles (10 to 30 nm) form in the wide (100 nm) γ channels. We use high resolution transmission electron microscopy (HR TEM) and 3D tomographic atom probe tomography (3D APT) to characterize the shape and the chemical composition of these nanoparticles. The thermodynamic and kinetic background of the formation of these nanoparticles is discussed in the light of previous results published in the literature.

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