Continuum modeling of dislocation starvation and subsequent nucleation in nano-pillar compressions
- Resource Type
- Article
- Authors
- Jérusalem, Antoine; Fernández, Ana; Kunz, Allison; Greer, Julia R.
- Source
- Scripta Materialia. Jan2012, Vol. 66 Issue 2, p93-96. 4p.
- Subject
- *ALUMINUM construction
*COLUMNS
*DISLOCATIONS in metals
*NANOSTRUCTURED materials
*NUCLEATION
*CONTINUUM mechanics
- Language
- ISSN
- 1359-6462
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. [ABSTRACT FROM AUTHOR]