Intrinsic nano-diffusion-couple for studying high temperature diffusion in multi-component superalloys

Eggeler Y, Kubacka D, Pichler P, Wu M, Spiecker E (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Scripta Materialia Elsevier

Book Volume: 192

Pages Range: 120-124

DOI: 10.1016/j.scriptamat.2020.10.002

Abstract

We present a new approach for the quantitative study of high-temperature diffusion in compositionally complex superalloys on the nano-scale. As key element, the approach utilizes the γ/γ'-microstructure itself as intrinsic nano-diffusion-couple (NDC). By establishing equilibrium at one temperature followed by annealing at a different temperature, well-defined transient states are generated which are studied using STEM-EDXS. We demonstrate this approach for a multi-component superalloy of CMSX-4 type. The temporal evolution of element concentrations is consistently revealed for γ- and γ'-forming elements and is compared to diffusion simulations based on DICTRA. Excellent agreement is obtained for Ni, Co, and Cr whereas diffusion of Al and, in particular, Re lacks behind in experiment. Finally, it is demonstrated that transient states can also be captured by in situ TEM using chip-based heating devices. The NDC approach offers great opportunities for diffusion studies in compositionally complex superalloys and might be extended to other two-phase multi-component systems.

Authors with CRIS profile

Yolita Eggeler Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Dorota Kubacka Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Mingjian Wu Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

Related research project(s)

High resolution transmission electron microscopy investigation of the atomic structure of defects and interfaces in single crystal superalloys (A07) (TRR 103) TRR 103: Vom Atom zur Turbinenschaufel - wissenschaftliche Grundlagen für eine neue Generation einkristalliner Superlegierungen Jan. 1, 2012 - Jan. 1, 2015

Involved external institutions

Fraunhofer-Institut für Integrierte Systeme und Bauelementetechnologie (IISB) DE Germany (DE)

How to cite

APA:

Eggeler, Y., Kubacka, D., Pichler, P., Wu, M., & Spiecker, E. (2021). Intrinsic nano-diffusion-couple for studying high temperature diffusion in multi-component superalloys. Scripta Materialia, 192, 120-124. https://dx.doi.org/10.1016/j.scriptamat.2020.10.002

MLA:

Eggeler, Yolita, et al. "Intrinsic nano-diffusion-couple for studying high temperature diffusion in multi-component superalloys." Scripta Materialia 192 (2021): 120-124.

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