On pipe diffusion of rhenium along misfit-dislocation-networks in Ni-base single crystal superalloys

Zehl R, Karpstein N, Saksena A, Horst OM, Kostka A, Gault B, Ludwig A, Fries SG, Spiecker E, Laplanche G, Eggeler G (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Acta Materialia Elsevier

Book Volume: 308

Article Number: 121656

DOI: 10.1016/j.actamat.2025.121656

Abstract

This study explores whether the diffusion of Re in the γ-phase of Ni-base superalloy single crystals is accelerated along fine dislocation networks that have formed at γ/γʹ-interfaces during high-temperature and low-stress creep. Diffusion couples of Re-enriched superalloy thin films were sputter deposited onto (100) planes of two Re-free single-crystalline nickel-base superalloys with different microstructures. One consisted of an as-processed microstructure with cuboidal γʹ-particles separated by thin γ-channels, with a low dislocation density. The other featured continuous γʹ-rafts parallel to the [100] direction with fine dislocation networks at the γ/γʹ-interfaces. The rafted structure was produced by 2 % creep deformation along the [001] direction at 1000 °C and 240 MPa. Analytical transmission electron microscopy and atom probe tomography revealed that the diffusion of Re into the γ-phase was not accelerated by the presence of dislocation networks at the γ/γʹ-interfaces of the rafted microstructure.

Authors with CRIS profile

Nicolas Karpstein Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)

Involved external institutions

Ruhr-Universität Bochum (RUB) DE Germany (DE) Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research DE Germany (DE)

How to cite

APA:

Zehl, R., Karpstein, N., Saksena, A., Horst, O.M., Kostka, A., Gault, B.,... Eggeler, G. (2026). On pipe diffusion of rhenium along misfit-dislocation-networks in Ni-base single crystal superalloys. Acta Materialia, 308. https://doi.org/10.1016/j.actamat.2025.121656

MLA:

Zehl, Rico, et al. "On pipe diffusion of rhenium along misfit-dislocation-networks in Ni-base single crystal superalloys." Acta Materialia 308 (2026).

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