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Yielding and irreversible deformation below the microscale: surface effects and non-mean-field plastic avalanches
Moretti, Paolo; Cerruti, Benedetta; Miguel López, María del Carmen
Universitat de Barcelona
Nanoindentation techniques recently developed to measure the mechanical response of crystals under external loading conditions reveal new phenomena upon decreasing sample size below the microscale. At small length scales, material resistance to irreversible deformation depends on sample morphology. Here we study the mechanisms of yield and plastic flow in inherently small crystals under uniaxial compression. Discrete structural rearrangements emerge as a series of abrupt discontinuities in stress-strain curves. We obtain the theoretical dependence of the yield stress on system size and geometry and elucidate the statistical properties of plastic deformation at such scales. Our results show that the absence of dislocation storage leads to crucial effects on the statistics of plastic events, ultimately affecting the universal scaling behavior observed at larger scales.
Cristalls
Materials nanoestructurats
Deformacions (Mecànica)
Crystals
Nanostructured materials
Deformations (Mechanics)
cc-by (c) Moretti, Paolo et al., 2011
http://creativecommons.org/licenses/by/3.0/es
Article
info:eu-repo/semantics/publishedVersion
Public Library of Science (PLoS)
         

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