Journal article

In situ observation of deformation processes in nanocrystalline face-centered cubic metals

Aaron Kobler, Christian Brandl, Horst Hahn, Christian Kuebel

BEILSTEIN JOURNAL OF NANOTECHNOLOGY | BEILSTEIN-INSTITUT | Published : 2016

Abstract

The atomistic mechanisms active during plastic deformation of nanocrystalline metals are still a subject of controversy. The recently developed approach of combining automated crystal orientation mapping (ACOM) and in situ straining inside a transmission electron microscope was applied to study the deformation of nanocrystalline Pd x Au1- x thin films. This combination enables direct imaging of simultaneously occurring plastic deformation processes in one experiment, such as grain boundary motion, twin activity and grain rotation. Large-angle grain rotations with ≈39° and ≈60° occur and can be related to twin formation, twin migration and twin-twin interaction as a result of partial dislocat..

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University of Melbourne Researchers

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Funding Acknowledgements

The authors would like to acknowledge Florian Bachmann, TU Bergakademie Freiberg, and Ralf Hielscher, TU Chemnitz, for their support with Mtex and Prof. David Mastronarde, University of Colorado, Boulder for the special IMOD version to align orientation images. We acknowledge Stefan Hengsbach, Karlsruhe Institute of Technology (KIT) for the production of sample transfer frames. Furthermore, we would like to thank Karsten Albe, Technische Universitat Darmstadt (TUD) and Edgar Rauch, Laboratoire de Science et Ingenierie des Materiaux et Procedes (SIMAP laboratory) for inspiring discussions and feedback. We thank Paul Vincze, Karlsruhe Institute of Technology (KIT) for the AFM measurements and Torsten Scherer as well as Robby Prang, Karlsruhe Institute of Technology (KIT) for their help with the FIB. Financial support by the German Science Foundation (DFG) as part of the research group FOR714 "Plastic deformation of nanocrystalline metals", support by the Karlsruhe Nano Micro Facility (KNMF), a large scale Helmholtz research infrastructure operated at Karlsruhe Institute of Technology (KIT) and support by the Robert Bosch Foundation in the framework of the Endowed Chair on Nanostructured Functional Materials at KIT is gratefully acknowledged.