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Strain gradients and the strength of nanoporous gold

Published online by Cambridge University Press:  31 January 2011

Rui Dou  and
Brian Derby
Brian Derby*
Affiliation:
School of Materials, University of Manchester, Manchester, M1 7HS United Kingdom
*
a)Address all correspondence to this author. e-mail: brian.derby@manchester.ac.uk
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Abstract

The very high strengths that have been reported for nanoporous gold may be related to strain gradients within the deforming porous microstructure. We present a mechanism-based model for the strength of nanoporous foams that is derived from conventional models for the deformation of macroscopic foams and now includes the influence of strain gradients. This model predicts that the strength of the ligaments within the nanoporous gold is proportional to the ligament diameter raised to the power −0.5. We have used the model to analyze experimental data for the strength of nanoporous gold and find excellent agreement with published data.

Keywords

StrengthNanoscaleAu
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 4 , April 2010 , pp. 746 - 753
Copyright
Copyright © Materials Research Society 2010

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