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Dislocation/hydrogen interaction mechanisms in hydrided nanocrystalline palladium films

Amin-Ahmadi, Behnam and Connétable, Damien and Fivel, Marc and Tanguy, Döme and Delmelle, Renaud and Turner, Stuart and Malet, Loic and Godet, Stephane and Pardoen, Thomas and Proost, Joris and Schryvers, Dominique and Idrissi, Hosni Dislocation/hydrogen interaction mechanisms in hydrided nanocrystalline palladium films. (2016) Acta Materialia, 111. 253-261. ISSN 1359-6454

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Official URL: http://dx.doi.org/10.1016/j.actamat.2016.03.054

Abstract

The nanoscale plasticity mechanisms activated during hydriding cycles in sputtered nanocrystalline Pd films have been investigated ex-situ using advanced transmission electron microscopy techniques. The internal stress developing within the films during hydriding has been monitored in-situ. Results showed that in Pd films hydrided to b-phase, local plasticity was mainly controlled by dislocation activity in spite of the small grain size. Changes of the grain size distribution and the crystallographic texture have not been observed. In contrast, significant microstructural changes were not observed in Pd films hydrided to a-phase. Moreover, the effect of hydrogen loading on the nature and density of dislocations has been investigated using aberration-corrected TEM. Surprisingly, a high density of shear type stacking faults has been observed after dehydriding, indicating a significant effect of hydrogen on the nucleation energy barriers of Shockley partial dislocations. Ab-initio calculations of the effect of hydrogen on the intrinsic stable and unstable stacking fault energies of palladium confirm the experimental observations.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université Libre de Bruxelles - ULB (BELGIUM)
Other partners > Universiteit Antwerpen - UA (BELGIUM)
Other partners > Université de Grenoble (FRANCE)
Other partners > Katholieke Universiteit Leuven - KU LEUVEN (BELGIUM)
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Deposited By: cirimat webmestre
Deposited On:06 Dec 2016 10:48

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