Discrete dislocation analysis of size effects in thin films

Lucia Nicola, Erik Van der Giessen, Alan Needleman

OnderzoeksoutputAcademicpeer review

145 Citaten (Scopus)
385 Downloads (Pure)

Samenvatting

A discrete dislocation plasticity analysis of plastic deformation in metal thin films caused by thermal stress is carried out. The calculations use a two-dimensional plane-strain formulation with only edge dislocations. Single crystal films with a specified set of slip systems are considered. The film-substrate system is subjected to a prescribed temperature history and a boundary value problem is formulated and solved for the evolution of the stress field and for the evolution of the dislocations structure in the film. A hard boundary layer forms at the interface between the film and the substrate, which does not scale with the film thickness and thus gives rise to a size effect. It is found that a reduction in the rate of dislocation nucleation can occur abruptly, which gives rise to a two-stage hardening behavior.
Originele taal-2English
Pagina's (van-tot)5920-5928
Aantal pagina's9
TijdschriftJournal of Applied Physics
Volume93
Nummer van het tijdschrift10
DOI's
StatusPublished - 15-mei-2003

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