A viscoplastic micromechanical model for the yield strength of nanocrystalline materials

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In this paper we present a micromechanical approach based on Fast Fourier Transforms to study the role played by dislocation glide and grain boundary (GB) accommodation in the determination of the plastic behavior of nanostructured materials. For this, we construct unit cells representing self-similar polycrystals with different grain sizes in the nanometer range and use local constitutive equations for slip and GB accommodation. We study the effect of grain size, strain rate and pressure on the local and effective behavior of nanostructured fcc materials with parameters obtained from experiments and atomistic simulations. Predictions of a previous qualitative pressure-sensitive model for ... continued below

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Lebensohn, R; Bringa, E & Caro, A March 14, 2006.

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In this paper we present a micromechanical approach based on Fast Fourier Transforms to study the role played by dislocation glide and grain boundary (GB) accommodation in the determination of the plastic behavior of nanostructured materials. For this, we construct unit cells representing self-similar polycrystals with different grain sizes in the nanometer range and use local constitutive equations for slip and GB accommodation. We study the effect of grain size, strain rate and pressure on the local and effective behavior of nanostructured fcc materials with parameters obtained from experiments and atomistic simulations. Predictions of a previous qualitative pressure-sensitive model for the effective yield strength behind a shock front are substantially improved by considering strain partition between slip and GB activity. Under quasiestatic conditions, assuming diffusion-controlled mechanisms at GB, the model predicts a strain-rate sensitivity increase in nanocrystalline samples with respect to the same coarse-grained material of the same order as in recently published experiments.

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PDF-file: 33 pages; size: 0.4 Mbytes

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  • Journal Name: Acta Materialia, vol. 55, N/A, January 1, 2007, pp. 261; Journal Volume: 55

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  • Report No.: UCRL-JRNL-219993
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 902247
  • Archival Resource Key: ark:/67531/metadc880335

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  • March 14, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 2, 2016, 6:13 p.m.

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Lebensohn, R; Bringa, E & Caro, A. A viscoplastic micromechanical model for the yield strength of nanocrystalline materials, article, March 14, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc880335/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.