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Deformation-induced grain growth and twinning in nanocrystalline palladium thin films

Kobler, Aaron and Lohmiller, Jochen and Schäfer, Jonathan and Kerber, Michael and Castrup, Anna and Kashiwar, Ankush and Gruber, Patric A. and Albe, Karsten and Hahn, Horst and Kübel, Christian (2013):
Deformation-induced grain growth and twinning in nanocrystalline palladium thin films.
In: Beilstein Journal of Nanotechnology, pp. 554-566, 4, ISSN 2190-4286,
[Online-Edition: http://dx.doi.org/10.3762/bjnano.4.64],
[Article]

Abstract

The microstructure and mechanical properties of nanocrystalline Pd films prepared by magnetron sputtering have been investigated as a function of strain. The films were deposited onto polyimide substrates and tested in tensile mode. In order to follow the deformation processes in the material, several samples were strained to defined straining states, up to a maximum engineering strain of 10%, and prepared for post-mortem analysis. The nanocrystalline structure was investigated by quantitative automated crystal orientation mapping (ACOM) in a transmission electron microscope (TEM), identifying grain growth and twinning/detwinning resulting from dislocation activity as two of the mechanisms contributing to the macroscopic deformation. Depending on the initial twin density, the samples behaved differently. For low initial twin densities, an increasing twin density was found during straining. On the other hand, starting from a higher twin density, the twins were depleted with increasing strain. The findings from ACOM-TEM were confirmed by results from molecular dynamics (MD) simulations and from conventional and in-situ synchrotron X-ray diffraction (CXRD, SXRD) experiments.

Item Type: Article
Erschienen: 2013
Creators: Kobler, Aaron and Lohmiller, Jochen and Schäfer, Jonathan and Kerber, Michael and Castrup, Anna and Kashiwar, Ankush and Gruber, Patric A. and Albe, Karsten and Hahn, Horst and Kübel, Christian
Title: Deformation-induced grain growth and twinning in nanocrystalline palladium thin films
Language: English
Abstract:

The microstructure and mechanical properties of nanocrystalline Pd films prepared by magnetron sputtering have been investigated as a function of strain. The films were deposited onto polyimide substrates and tested in tensile mode. In order to follow the deformation processes in the material, several samples were strained to defined straining states, up to a maximum engineering strain of 10%, and prepared for post-mortem analysis. The nanocrystalline structure was investigated by quantitative automated crystal orientation mapping (ACOM) in a transmission electron microscope (TEM), identifying grain growth and twinning/detwinning resulting from dislocation activity as two of the mechanisms contributing to the macroscopic deformation. Depending on the initial twin density, the samples behaved differently. For low initial twin densities, an increasing twin density was found during straining. On the other hand, starting from a higher twin density, the twins were depleted with increasing strain. The findings from ACOM-TEM were confirmed by results from molecular dynamics (MD) simulations and from conventional and in-situ synchrotron X-ray diffraction (CXRD, SXRD) experiments.

Journal or Publication Title: Beilstein Journal of Nanotechnology
Volume: 4
Uncontrolled Keywords: ACOM-TEM, deformation mechanism, nanostructured metals, tensile testing, XRD
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Feb 2014 11:39
Official URL: http://dx.doi.org/10.3762/bjnano.4.64
Additional Information:

This article is part of the Thematic Series "Advances in nanomaterials" and is dedicated to Prof. Horst Hahn on the occasion of his 60th birthday.

Identification Number: doi:10.3762/bjnano.4.64
Funders: Financial support through the DFG grant “DFG Forschergruppe714: Plastizität in nanokristallinen Metallen und Legierungen” and the Karlsruhe Nano Micro Facility (KNMF) is gratefully acknowledged.
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