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Title: Yielding and irreversible deformation below the microscale: surface effects and non-mean-field plastic avalanches
Author: Moretti, Paolo
Cerruti, Benedetta
Miguel López, María del Carmen
Keywords: Cristalls
Materials nanoestructurats
Deformacions (Mecànica)
Nanostructured materials
Deformations (Mechanics)
Issue Date: 7-Jun-2011
Publisher: Public Library of Science (PLoS)
Abstract: 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.
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It is part of: PLoS One, 2011, vol. 6, num. 6, p. e20418-e20418
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ISSN: 1932-6203
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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