Understanding the Extremely Low Fracture Toughness of Freestanding Gold Thin Films by In-situ Bulge Testing in an AFM

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Preiß E, Merle B, Göken M
Zeitschrift: Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
Jahr der Veröffentlichung: 2017
Band: 691
Seitenbereich: 218-225
ISSN: 0921-5093
Sprache: Englisch


Abstract


The fracture toughness of freestanding gold films with thicknesses between 60 nm and 320 nm was determined by bulge testing to be around 2 MPa m1/2. This surprisingly low value confirms the trend also observed for other metals that thin films exhibit only a fraction of the bulk fracture toughness. In order to understand this behavior, the fracture process of freestanding gold films with a crack introduced by focused ion beam (FIB) milling was observed in-situ in an atomic force microscope (AFM). AFM scans of the crack tip region show stable crack growth mainly along grain boundaries. Plastic deformation is localized in a narrow corridor in front of the crack tip. A large plastic zone, as one would typically expect under plane stress, is not observed. Instead, strong local necking is evidenced. We conclude that the spatial confinement of the plastic deformation is the primary reason for the low fracture toughness of metallic thin films.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Göken, Mathias Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Merle, Benoit PD Dr. habil.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Preiß, Eva
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)


Zusätzliche Organisationseinheit(en)
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Exzellenz-Cluster Engineering of Advanced Materials
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Forschungsbereiche

A2 Nanoanalysis and Microscopy
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Preiß, E., Merle, B., & Göken, M. (2017). Understanding the Extremely Low Fracture Toughness of Freestanding Gold Thin Films by In-situ Bulge Testing in an AFM. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 691, 218-225. https://dx.doi.org/10.1016/j.msea.2017.03.037

MLA:
Preiß, Eva, Benoit Merle, and Mathias Göken. "Understanding the Extremely Low Fracture Toughness of Freestanding Gold Thin Films by In-situ Bulge Testing in an AFM." Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing 691 (2017): 218-225.

BibTeX: 

Zuletzt aktualisiert 2019-28-05 um 13:31