Continuum modeling of dislocation starvation and subsequent nucleation in nano-pillar compressions
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 p...
| Huvudupphovsmän: | , , , |
|---|---|
| Materialtyp: | Journal article |
| Språk: | English |
| Publicerad: |
2012
|
| Sammanfattning: | 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. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
|---|