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Ramathasan Thevamaran's picture

Origins of size effects in initially dislocation-free single-crystal silver micro- and nanocubes

Sat, 2021-07-03 13:35 - Ramathasan Thev...
research
Size effects
single crystals
silver
Plasticity
crystal defects
MD simulations

We report phenomenal yield strengths—up to one-fourth of the theoretical strength of silver—recorded in microcompression testing of initially dislocation-free silver micro- and nanocubes synthesized from a multistep seed-growth process. These high strengths and the massive strain bursts that occur upon yield are results of the initially dislocation-free single-crystal structure of the pristine samples that yield through spontaneous nucleation of dislocations.

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Gi-Dong Sim's picture

Improving the stretchability of as-deposited Ag coatings on poly-ethylene-terephthalate substrates

Thu, 2012-12-13 13:28 - Gi-Dong Sim
research
ductile fracture
coatings
Vlassak group
annealing
evaporation
failure (mechanical)
metallic thin films
silver

In this paper, we report that silver films evaporated on poly-ethylene-terephthalate (PET) substrates coated with an acrylic primer can be stretched beyond 70% without fracture. As-deposited films show a larger failure strain than annealed coatings. These observations are rationalized in light of a ductile fracture mechanism where debonding from the substrate coevolves with strain localization. The results of this study indicate that PET substrates coated with an acrylic primer layer may be suitable for stretchable electronics.

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