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

Kobler, Aaron and Lohmiller, Jochen and Schaefer, Jonathan and Kerber, Michael and Castrup, Anna and Kashiwar, Ankush and Gruber, Patric A. and Albe, Karsten and Hahn, Horst and Kuebel, Christian (2013) Deformation-induced grain growth and twinning in nanocrystalline palladium thin films. In: BEILSTEIN JOURNAL OF NANOTECHNOLOGY, 4 . pp. 554-566.

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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:	Journal Article
Publication:	BEILSTEIN JOURNAL OF NANOTECHNOLOGY
Publisher:	BEILSTEIN-INSTITUT
Additional Information:	Copyright of this article is belongs to BEILSTEIN-INSTITUT
Keywords:	ACOM-TEM; deformation mechanism; nanostructured metals; tensile testing; XRD
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	25 Oct 2013 14:58
Last Modified:	25 Oct 2013 14:58
URI:	http://eprints.iisc.ac.in/id/eprint/47575

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