Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites

Gabel S, Giese S, Merle B, Sprenger I, Heilmaier M, Neumeier S, Bitzek E, Göken M (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Advanced Engineering Materials Wiley

URI: https://onlinelibrary.wiley.com/doi/epdf/10.1002/adem.202001464

DOI: 10.1002/adem.202001464

Abstract

Lamellar eutectic NiAl–Cr(Mo) alloys show an increased fracture toughness due to different toughening mechanisms. These mechanisms result from the fibrous or lamellar microstructure of the two constituting phases α-Cr(Mo) and β-NiAl. However, the fracture toughness of the individual phases and the evolution from early crack growth to the toughening mechanisms have not yet been systematically studied. Herein, bending tests on focused ion beam (FIB)-notched microcantilever beams are used to characterize the small-scale fracture properties. The micromechanical investigations reveal that the fracture toughness of the α-Cr(Mo) phase ((Formula presented.)) is much higher than the fracture toughness of β-NiAl ((Formula presented.)). Larger cantilevers in the crack arresting orientation show an enhanced fracture toughness with up to (Formula presented.), which is still lower than the one of macroscopic experiments. This is attributed to the small interaction volume of the crack, which hinders the full exploitation of potential extrinsic toughening mechanisms.

Authors with CRIS profile

Stefan Gabel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Sven Giese Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Benoit Merle Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Erik Bitzek Professur für Datenbasierte Materialmodellierung Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Microscopic Origins of Fracture Toughness (microKlc) Microscopic Origins of Fracture Toughness May 1, 2017 - April 30, 2022

Involved external institutions

Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

Gabel, S., Giese, S., Merle, B., Sprenger, I., Heilmaier, M., Neumeier, S.,... Göken, M. (2021). Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites. Advanced Engineering Materials. https://doi.org/10.1002/adem.202001464

MLA:

Gabel, Stefan, et al. "Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites." Advanced Engineering Materials (2021).

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