Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1446837 | Acta Materialia | 2012 | 12 Pages |
Abstract
The mechanical behaviour of thin nanocrystalline palladium films with an ∼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.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
M.-S. Colla, B. Wang, H. Idrissi, D. Schryvers, J.-P. Raskin, T. Pardoen,