Microstructural dependence of the fracture toughness of metallic thin films: A bulge test and atomistic simulation study on single-crystalline and polycrystalline silver films

Preiß E, Lyu H, Liebig JP, Richter G, Gannott F, Gruber PA, Göken M, Bitzek E, Merle B (2019)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2019

Journal

Journal of Materials Research Cambridge University Press

Book Volume: 34

Pages Range: 3483-3494

Journal Issue: 20

URI: https://www.cambridge.org/core/journals/journal-of-materials-research/article/microstructural-dependence-of-the-fracture-toughness-of-metallic-thin-films-a-bulge-test-and-atomistic-simulation-study-on-singlecrystalline-and-polycrystalline-silver-films/73FEF9FD56EFF314E1366003EFFE8C5B#

DOI: 10.1557/jmr.2019.262

Open Access Link: https://www.cambridge.org/core/journals/journal-of-materials-research/article/microstructural-dependence-of-the-fracture-toughness-of-metallic-thin-films-a-bulge-test-and-atomistic-simulation-study-on-singlecrystalline-and-polycrystalline-silver-film

Abstract

The microstructure contribution to the very low fracture toughness of freestanding metallic thin films was investigated by bulge fracture tests on 200-nm-thick {100} single-crystalline and polycrystalline silver films. The single-crystalline films exhibited a significantly lower fracture toughness value (KIC = 0.88 MPa m1/2) than their polycrystalline counterparts (KIC = 1.45 MPa m1/2), which was rationalized by the observation of an unusual crack initiation behavior - characterized by twinning in front of the notch tip - during in situ testing in the atomic force microscope. Twinning was also observed as a dominant deformation mechanism in atomistic simulations. This twinning tendency is explained by comparing the resolved shear stresses acting on the leading partial dislocation and the full dislocation, which allows to develop a size- and orientation-dependent twinning criterion. The fracture toughness of polycrystalline samples was found to be higher because of the energy dissipation associated with full dislocation plasticity and because of crack meandering along grain boundaries.

Authors with CRIS profile

Eva Preiß Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Hao Lyu Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Jan Philipp Liebig Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Erik Bitzek Professur für Datenbasierte Materialmodellierung Benoit Merle Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

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

Related research project(s)

Mechanische Eigenschaften und Bruchverhalten von dünnen Schichten (GRK1896-B3) In-situ Characterization of Nanomaterials with Electrons, X-rays/Neutrons and Scanning Probes (GRK 1896) April 1, 2018 - Sept. 30, 2022 Microscopic Origins of Fracture Toughness (microKlc) Microscopic Origins of Fracture Toughness May 1, 2017 - April 30, 2022 In-situ nanomechanics and FIB tomography of thin films (EXC315 EAM (A2-3)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2012 - Oct. 31, 2017

Involved external institutions

Karlsruhe Institute of Technology (KIT) DE Germany (DE) Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE) Max Planck Institute for Intelligent Systems (MPI-IS) / Max-Planck-Institut für Intelligente Systeme DE Germany (DE)

How to cite

APA:

Preiß, E., Lyu, H., Liebig, J.P., Richter, G., Gannott, F., Gruber, P.A.,... Merle, B. (2019). Microstructural dependence of the fracture toughness of metallic thin films: A bulge test and atomistic simulation study on single-crystalline and polycrystalline silver films. Journal of Materials Research, 34(20), 3483-3494. https://doi.org/10.1557/jmr.2019.262

MLA:

Preiß, Eva, et al. "Microstructural dependence of the fracture toughness of metallic thin films: A bulge test and atomistic simulation study on single-crystalline and polycrystalline silver films." Journal of Materials Research 34.20 (2019): 3483-3494.

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