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The stressstrain response of nanocrystalline metals: A statistical analysis of atomistic simulations
 

Summary: The stress≠strain response of nanocrystalline metals:
A statistical analysis of atomistic simulations
E. Bitzek a
, P.M. Derlet a
, P.M. Anderson b
, H. Van Swygenhoven a,*
a
Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
b
Department of Materials Science and Engineering, Ohio State University, 2041 College Road, Columbus, OH 43210, USA
Received 27 February 2008; received in revised form 30 May 2008; accepted 30 May 2008
Available online 12 July 2008
Abstract
Atomistic simulations of the tensile deformation of three-dimensional nanocrystalline Al samples at constant strain rate and temper-
ature are analyzed in terms of grain-averaged shear produced by dislocation slip and the grain-averaged resolved shear stress during
deformation. To assess the influence of the grain-boundary character on the deformation behavior, three samples with different micro-
structures but the same average grain size were simulated. Detailed analysis of the atomic processes allowed correlation of the stress sig-
nature of slip events with typical dislocation processes related to nucleation and propagation. The results of the mesoscopic analysis of
the atomistic simulations are discussed in the framework of micromechanic models for nanocrystal plasticity.
” 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  

Source: Anderson, Peter M. - Department of Materials Science and Engineering, Ohio State University

 

Collections: Materials Science