Critical behavior and size dependence in dislocation plasticity

Details Critical behavior and size dependence in dislocation plasticity Critical behavior and size dependence in dislocation plasticity

2011-06-17

arxiv.org/abs/1106.3444v2

Physics

Condensed Matter

Materials Science

This manuscript has been withdrawn since we discovered that some of the numerical results are incorrect

Scientific paper

Microcrystals deform very differently from their macroscopic counterparts, displaying a size-dependent yield stress and intermittent plastic strain bursts. Here we demonstrate that size effects and strain bursts may be just two different signatures of fundamental collective phenomena that govern the dynamics of dislocation systems on all scales. We confirm this conjecture by demonstrating agreement between the results of 2D and 3D dislocation dynamics simulations and experimental results on compressed micropillars. Our results indicate that many peculiarities of small-sample plasticity may arise from the finite-size scaling properties of collective dislocation dynamics, rather than from changes in the physical mechanisms governing dislocation motion.

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