publication . Article . 2015

The role of partial mediated slip during quasi-static deformation of 3D nanocrystalline metals

Irene J. Beyerlein; Marisol Koslowski; Abigail Hunter; Lei Cao;
Open Access
  • Published: 01 May 2015 Journal: Journal of the Mechanics and Physics of Solids, volume 78, pages 415-426 (issn: 0022-5096, Copyright policy)
  • Publisher: Elsevier BV
Abstract
Abstract We present dislocation simulations involving the collective behavior of partials and extended full dislocations in nanocrystalline materials. While atomistic simulations have shown the importance of including partial dislocations in high strain rate simulations, the behavior of partial dislocations in complex geometries with lower strain rates has not been explored. To account for the dissociation of dislocations into partials we include the full representation of the gamma surface for two materials: Ni and Al. During loading, dislocation loops are emitted from grain boundaries and expand into the grain interiors to carry the strain. In agreement with h...
Subjects
arXiv: Condensed Matter::Materials Science
free text keywords: Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, Materials science, Partial dislocations, Plasticity, Dislocation creep, Frank-Read Source, Grain boundary, Grain boundary strengthening, Dislocation, Slip (materials science)
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