Strength and toughness of interfaces at small scales

Mechanical properties and fracture behavior of thin layers

(Third Party Funds Group – Sub project)

Overall project: In situ Microscopy with Electrons, X-rays and Scanning Probes
Project leader: Mathias Göken, Benoit Merle
Project members: Eva Preiß, Jan Philipp Liebig, Patrick Feldner, Manuel Köbrich
Start date: 1. October 2013
End date: 30. September 2017
Extension Datevv: 30. September 2022
Acronym: GRK1896-B3
Funding source: DFG / Graduiertenkolleg (GRK)

Abstract:

The mechanical properties of metals are strongly affected by interfaces. Within this project area micromechanical testing methods such as micro tensile testing, bulge testing and nanoindentation are applied to metallic thin films or micropillars.In situ electron microscopy and atomic force microscopy are used to analyze the resulting deformation processes. The goal is to understand how grain boundaries and surfaces influence the strength and fracture toughness of metals.

Publications:

• Preiß E., Merle B., Xiao Y., Gannott F., Liebig JP., Wheeler JM., Göken M.:
  Applicability of focused Ion beam (FIB) milling with gallium, neon, and xenon to the fracture toughness characterization of gold thin films
  In: Journal of Materials Research (2021)
  ISSN: 0884-2914
  DOI: 10.1557/s43578-020-00045-w
  URL: https://link.springer.com/content/pdf/10.1557/s43578-020-00045-w.pdf
  BibTeX: Download
• Feldner P., Merle B., Göken M.:
  Breakdown of the superplastic deformation behavior of heterogeneous nanomaterials at small length scales
  In: Materials Research Letters 9 (2021), p. 41-49
  ISSN: 2166-3831
  DOI: 10.1080/21663831.2020.1818323
  URL: https://www.tandfonline.com/doi/pdf/10.1080/21663831.2020.1818323
  BibTeX: Download
• Liebig JP., Mackovic M., Spiecker E., Göken M., Merle B.:
  Grain boundary mediated plasticity: A blessing for the ductility of metallic thin films?
  In: Acta Materialia 215 (2021), Article No.: 117079
  ISSN: 1359-6454
  DOI: 10.1016/j.actamat.2021.117079
  URL: https://www.sciencedirect.com/science/article/pii/S1359645421004596/pdfft?isDTMRedir=true&download=true
  BibTeX: Download
• Pohl P., Kümmel F., Schunk C., Serrano-Munoz I., Markötter H., Göken M., Höppel HW.:
  About the role of interfaces on the fatigue crack propagation in laminated metallic composites
  In: Materials 14 (2021), Article No.: 2564
  ISSN: 1996-1944
  DOI: 10.3390/ma14102564
  BibTeX: Download
• Böhm C., Feldner P., Merle B., Wolf S.:
  Conical nanoindentation allows azimuthally independent hardness determination in geological and biogenic minerals
  In: Materials 12 (2019), Article No.: 1630
  ISSN: 1996-1944
  DOI: 10.3390/ma12101630
  BibTeX: Download