On the fracture behavior of Cr2AlC coatings

Völker, Bernhard; Stelzer, Bastian; Mráz, Stanislav; Rueß, Holger; Sahu, Rajib; Kirchlechner, Christoph; Dehm, Gerhard; Schneider, Jochen Michael

doi:10.1016/j.matdes.2021.109757

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On the fracture behavior of Cr₂AlC coatings

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Völker, Bernhard
Materials Chemistry, RWTH Aachen University, Aachen, Germany;
Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Department of Materials Physics, Montanuniversität Leoben, Austria;

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Sahu, Rajib
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Materials Chemistry, RWTH Aachen University, Kopernikusstraße 10, D-52074 Aachen, Germany;

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Kirchlechner, Christoph
Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Institute for Applied Materials (IAM-WBM), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany;

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Dehm, Gerhard
Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Völker, B., Stelzer, B., Mráz, S., Rueß, H., Sahu, R., Kirchlechner, C., et al. (2021). On the fracture behavior of Cr₂AlC coatings. Materials and Design, 206: 109757. doi:10.1016/j.matdes.2021.109757.

Cite as: https://hdl.handle.net/21.11116/0000-0009-3ED7-0

Abstract

Bulk MAX phase materials were investigated heavily in the last decades due to their advantageous combination of metallic and ceramic properties. In recent years, MAX phases also gained the interest of the protective coatings community. Cr2AlC is a very promising material, since the crystalline MAX phase can be deposited at comparatively low (550 degrees C) substrate temperatures. Another advantage of the Cr2AlC MAX phase is its self-healing ability. The goal of this investigation was to characterize the fracture toughness of Cr2AlC protective coatings using in situ SEM micro-cantilever tests and to determine the influence of different microstructures on the fracture behavior. Surprisingly, the fracture toughness is only moderately affected by the microstructure of the crystalline samples investigated here, which reveal a fracture toughness ranging from 1.8 +/- 0.1 MPam1/2 to 2.4 +/- 0.2 MPam1/2. In contrast to that, it could be shown that there is a significant increase in fracture toughness for the amorphous coating with identical chemical composition (4.1 +/- 0.5 MPam1/2) of almost twice the fracture toughness compared to the crystalline coatings. The detrimental influence of grain boundaries in the crystalline coating and the lack of grain boundaries in the amorphous sample might explain the formidable fracture toughness. (c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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