The effect of film thickness variations in periodic cracking: Analysis and experiments |
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| Authors: | AA Taylor V Edlmayr MJ Cordill G Dehm |
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| Affiliation: | 1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria;2. Department of Materials Science, Montanuniversität Leoben, Franz-Josef-Strasse 18, 8700 Leoben, Austria;3. Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), Albert-Einstein-Str. 15, 12489 Berlin, Germany;1. Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany;2. Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, 7491, Norway;3. Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen, Germany;1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, Leoben 8700 Austria;2. Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany;3. Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany;4. Department of Materials Physics, Montanuniversität Leoben, Jahnstrasse 12, Leoben 8700, Austria;1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, Leoben 8700, Austria;2. Department of Materials Science, Montanuniversität Leoben, Franz-Josef-Strasse 18, Leoben 8700, Austria;3. Empa, Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, Thun 3602, Switzerland;4. Synchrotron SOLEIL, L‘Orme des Merisiers, Saint-Aubin, BP 48, Gif-sur-Yvette Cedex 91192, France;5. Pprime Institute, CNRS-University of Poitiers, Departement de Physique et Mecanique des Materiaux, 11 Bd Pierre et Marie Curie TSA 41123, Poitiers Cedex 9 86073, France;6. LSPM-CNRS, UPR3407, Université Sorbonne Paris Nord, Villetaneuse 93430, France;1. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Strasse 18, 8700 Leoben, Austria;2. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Montanuniversität Leoben, Jahnstrasse 12, 8700 Leoben, Austria;3. Department of Materials Physics, Montanuniversität Leoben, Jahnstrasse 12, 8700 Leoben, Austria;4. Business Unit Coating, PLANSEE SE, Metallwerk-Plansee-Strasse 71, 6600 Reutte, Austria |
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| Abstract: | Periodic cracking experiments are frequently used in the assessment of interface quality in brittle film/compliant substrate systems. Through these techniques it is possible to extract a quantitative measure of interface shear strength and therefore assess the mechanical suitability of the films for application. The influence of film thickness inhomogeneities on the crack spacing is assessed in this study. While film thickness inhomogeneities are always present in thin film systems, only nominal thickness values have been considered up to this point. By defining two separate regimes of film thickness variation, roughness and unevenness, in relation to the crack spacing, the influence of such variation on the data is analysed. The results of this analysis are then considered in reference to a model system of an amorphous alumina film on a copper substrate (AlxOy/Cu), the limits of this analysis are then discussed. |
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