Microcantilever Fracture Tests of α-Cr Containing NiAl Bond Coats

Gabel S, Giese S, Webler R, Neumeier S, Göken M (2022)

Publication Type: Journal article

Publication year: 2022

Journal

DOI: 10.1002/adem.202101429

Abstract

MCrAlY bond coats are widely used as oxidation-resistant coatings on superalloys. The major phase is the thermally stable intermetallic β-NiAl phase. The addition of Cr increases the oxidation and corrosion resistance but leads to the formation of α-Cr precipitates. Both phases are brittle and limit the fracture toughness of these coatings. To study the influence of thermal exposure and the resulting changing chemical composition on the fracture properties, the fracture toughness of both phases is measured by notched microcantilever bending, after processing and after oxidation by thermal cycling. The fracture toughness of β-NiAl decreases during thermal cycling due to the depletion in Al, whereas the fracture toughness and the composition of α-Cr stay constant. As the fracture toughness of α-Cr is lower compared with β-NiAl, the formation of α-Cr precipitates is supposed to decrease the fracture toughness of the bond coat.

Authors with CRIS profile

Stefan Gabel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Sven Giese Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Ralf Webler Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

How to cite

APA:

Gabel, S., Giese, S., Webler, R., Neumeier, S., & Göken, M. (2022). Microcantilever Fracture Tests of α-Cr Containing NiAl Bond Coats. Advanced Engineering Materials. https://dx.doi.org/10.1002/adem.202101429

MLA:

Gabel, Stefan, et al. "Microcantilever Fracture Tests of α-Cr Containing NiAl Bond Coats." Advanced Engineering Materials (2022).

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