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Effect of hydriding induced defects on the small-scale plasticity mechanisms in nanocrystalline palladium thin films

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Lumbeeck, Gunnar [University of Antwerp] Idrissi, Hosni [UCL] Amin-Ahmadi, Behnam [Colorado School of Mines] Favache, Audrey [UCL] Delmelle, Renaud [Zurich University of Applied Sciences] Proost, Joris [UCL] Pardoen, Thomas [UCL] Schryvers, Dominique [University of Antwerp]

Nanoindentation tests performed on nanocrystalline palladium films subjected to hydriding/dehydriding cycles demonstrate a significant softening when compared to the as-received material. The origin of this softening is unraveled by combining in situ TEM nanomechanical testing with automated crystal orientation mapping in TEM and high resolution TEM. The softening is attributed to the presence of a high density of stacking faults and of Shockley partial dislocations after hydrogen loading. The hydrogen induced defects affect the elementary plasticity mechanisms and the mechanical response by acting as preferential sites for twinning/detwinning during deformation. These results are analyzed and compared to previous experimental and simulation works in the literature. This study provides new insights into the effect of hydrogen on the atomistic deformation and cracking mechanisms as well as on the mechanical properties of nanocrystalline thin films and membranes.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2018
Language Anglais
Journal information "Journal of Applied Physics" - Vol. 124, no.22, p. 225105 (2018)
Peer reviewed yes
Publisher AIP Publishing
issn 0021-8979
e-issn 1089-7550
Publication status Publié
Affiliations UCL - SST/IMMC/IMAP - Materials and process engineering
University of Antwerp - EMAT
Colorado School of Mines - Department of Mechanical Engineering
Zurich University of Applied Sciences - Institute for Materials and Process Engineering (IMPE)
Keywords Nanocrystalline Pd films ; Mechanical testing ; ACOM-TEM ; Stacking faults ; Electron microscopy
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Bibliographic reference Lumbeeck, Gunnar ; Idrissi, Hosni ; Amin-Ahmadi, Behnam ; Favache, Audrey ; Delmelle, Renaud ; et. al. Effect of hydriding induced defects on the small-scale plasticity mechanisms in nanocrystalline palladium thin films. In: Journal of Applied Physics, Vol. 124, no.22, p. 225105 (2018)
Permanent URL http://hdl.handle.net/2078.1/212430