4.7 Article

Continuum modeling of dislocation starvation and subsequent nucleation in nano-pillar compressions

期刊

SCRIPTA MATERIALIA
卷 66, 期 2, 页码 93-96

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2011.10.009

关键词

Continuum model; Nanopillar; Crystal plasticity; Dislocation starvation

资金

  1. National Science Foundation [DMR-0748267]
  2. Office of Naval Research [N000140910883]
  3. Spanish Ministry of Science and Innovation
  4. European Union (Madrid Regional Government) [ESTRUMAT-S2009/MAT-1585]
  5. Caltech SURF
  6. Direct For Mathematical & Physical Scien [0748267] Funding Source: National Science Foundation

向作者/读者索取更多资源

The mechanical behavior of single crystalline aluminum nano-pillars under uniaxial compression differs from bulk Al in that the former is characterized by a smoother transition from elasticity to plasticity. We propose an extension of the phenomenological model of dislocation starvation originally proposed in [Greer and Nix, Phys. Rev. B 73 (2006) 245410] additionally accounting for dislocation nucleation. The calibrated and validated continuum model successfully captures the intrinsic mechanisms leading to the transition from dislocation starvation to dislocation nucleation in fcc nano-pillars. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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