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Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

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Fundamental differences in mechanical behavior between two types of crystals at the nanoscale

Cited 134 times inthomson ciCited 109 times inthomson ci
Title
Fundamental differences in mechanical behavior between two types of crystals at the nanoscale
Author
Brinckmann, SteffenKim, Ju-YoungGreer, Julia R.
Keywords
DISLOCATION DYNAMICS SIMULATIONS; SINGLE-CRYSTALS; PLASTICITY SIZE; ATOMISTIC SIMULATION; STRAIN GRADIENTS; FCC METALS; THIN-FILMS; DEFORMATION; SCALE; MOTION
Issue Date
200804
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.100, no.15, pp.1 - 4
Abstract
We present differences in the mechanical behavior of nanoscale gold and molybdenum single crystals. A significant strength increase is observed as the size is reduced to 100 nm. Both nanocrystals exhibit discrete strain bursts during plastic deformation. We postulate that they arise from significant differences in the dislocation behavior. Dislocation starvation is the predominant mechanism of plasticity in nanoscale fcc crystals, while junction formation and hardening characterize bcc plasticity. A statistical analysis of strain bursts is performed as a function of size and compared with stochastic models.
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DOI
http://dx.doi.org/10.1103/PhysRevLett.100.155502
ISSN
0031-9007
Appears in Collections:
MSE_Journal Papers
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