期刊
ACTA MATERIALIA
卷 60, 期 4, 页码 1795-1806出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.11.054
关键词
Nanocrystalline film; Twinning; Tensile testing; Strengthening mechanism; Analytical modelling
资金
- Communaute Francaise de Belgique
- Universite catholique de Louvain through an ARC of the Fonds Belge pour la Recherche dans l'Industrie et l'Agriculture (FRIA) [11/16-037]
- Belgian Science Policy [IAP 6/24]
The mechanical behaviour of thin nanocrystalline palladium films with an similar to 30 nm in plane grain size has been characterized on chip under uniaxial tension. The films exhibit a large strain hardening capacity and a significant increase in the strength with decreasing thickness. Transmission electron microscopy has revealed the presence of a moderate density of growth nanotwins interacting with dislocations. A semi-analytical grain aggregate model is proposed to investigate the impact of different contributions to the flow behaviour, involving the effect of twins, of grain size and of the presence of a thin surface layer. This model provides guidelines to optimizing the strength/ductility ratio of the films. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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