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

GÜRSES E., Tamer E. S.

COMPUTATIONAL MATERIALS SCIENCE, vol.50, no.2, pp.639-644, 2010 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 2
  • Publication Date: 2010
  • Doi Number: 10.1016/j.commatsci.2010.09.028
  • Journal Name: COMPUTATIONAL MATERIALS SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.639-644
  • Middle East Technical University Affiliated: No

Abstract

We present 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. (C) 2010 Elsevier B.V. All rights reserved.