On tension-compression asymmetry in ultrafine-grained and nanocrystalline metals

Abstract
We present a physically motivated computational study explaining the tension/compression (T/C) asymmetry phenomenon in nanocrystalline (nc) and ultrafine-grained (ufg) face centered cubic (fcc) metals utilizing a variational constitutive model where the nc-metal is modeled as a two-phase material consisting of a grain interior phase and a grain boundary affected zone (GBAZ). We show that the existence of voids and their growth in GBAZ renders the material pressure sensitivity due to porous plasticity and that the utilized model provides a physically sound mechanism to capture the experimentally observed T/C asymmetry in nc- and ufg-metals. © 2010 Elsevier B.V. All rights reserved.

Citation
Gürses, E., & El Sayed, T. (2010). On tension–compression asymmetry in ultrafine-grained and nanocrystalline metals. Computational Materials Science, 50(2), 639–644. doi:10.1016/j.commatsci.2010.09.028

Acknowledgements
This work was fully funded by the KAUST baseline fund.

Publisher
Elsevier BV

Journal
Computational Materials Science

DOI
10.1016/j.commatsci.2010.09.028

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