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Deformation and Failure of Nanostructured Materials with Bimodal Grains

Published online by Cambridge University Press:  15 March 2011

R.Q. Ye ,
B.Q. Han  and
E.J. Lavernia
R.Q. Ye
Affiliation:
Department of Chemical Engineering & Materials Science University of California, Davis, CA 95616
B.Q. Han
Affiliation:
Department of Chemical Engineering & Materials Science University of California, Davis, CA 95616
E.J. Lavernia*
Affiliation:
Department of Chemical Engineering & Materials Science University of California, Davis, CA 95616
*
Corresponding author, Email: [email protected]
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Abstract

The low ductility of nanostructured materials is attributed to the deficit of dislocation activity in the nanometer range. Recent scientific interest in nanostructured materials stems from reports of alterative combinations of mechanical properties, although a low ductility is typically reported. One promising approach based on the concept of multiple length scales is illustrated by a “bimodal” microstructure, i.e. containing a mixture of nanostructured and coarse grains. The present work reports a numerical study of the tensile deformation and fracture of a nanostructured Al alloy with a bimodal microstructure. In the theoretical framework used in the present study, the elastic-plastic behavior and deformation processes are approximated by Ramberg-Osgood formula and finite element method, respectively. The numerical results are found to be in a good agreement with the experimental behavior.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 821: Symposium P – Nanoscale Materials & Modeling-Relations Among Processing, Microstructure and Mechanical Properties , 2004 , P8.15
Copyright
Copyright © Materials Research Society 2004

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