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Ag effects on the elastic modulus values of nanoporous Au foams

Published online by Cambridge University Press:  31 January 2011

A.M. Hodge ,
R.T. Doucette ,
M.M. Biener ,
J. Biener ,
O. Cervantes  and
A.V. Hamza
A.M. Hodge*
Affiliation:
Aerospace and Mechanical Engineering Department, University of Southern California, Los Angeles, California 90089
R.T. Doucette
Affiliation:
Aerospace and Mechanical Engineering Department, University of Southern California, Los Angeles, California 90089
M.M. Biener
Affiliation:
Aerospace and Mechanical Engineering Department, University of Southern California, Los Angeles, California 90089
J. Biener
Affiliation:
Aerospace and Mechanical Engineering Department, University of Southern California, Los Angeles, California 90089
O. Cervantes
Affiliation:
Aerospace and Mechanical Engineering Department, University of Southern California, Los Angeles, California 90089
A.V. Hamza
Affiliation:
Nanoscale Synthesis and Characterization Laboratory, Lawrence Livermore National Laboratory, Livermore, California 94550
*
a) Address all correspondence to this author. e-mail: ahodge@usc.edu
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Abstract

To study both the effect of Ag and the relative density on the elastic properties of nanoporous Au (np-Au) foams, partially as well as fully dealloyed np-Au samples with various ligament sizes were prepared. Additionally, Ag-coated np-Au samples were synthesized by immersing np-Au in a 1 M Ag nitrate solution, followed by drying and thermal decomposition of the deposited Ag nitrate salt to Ag, NO2, and O2. Cross-sectional analysis revealed that this method yields a homogeneous Ag distribution and that the Ag concentration can be adjusted within the range of 0 to 20 at.%. Mechanical testing was performed by depth-sensing nanoindentation. It was observed that the effect of the relative density on the elastic properties of np-Au seems to be much stronger than predicted by the Gibson and Ashby relationship: Even Ag contents as low as 1 at.% can significantly change the modulus values. On the other hand, the elastic modulus of np-Au seems to be independent of the ligament size.

Keywords

Elastic propertiesFoamNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1600 - 1606
Copyright
Copyright © Materials Research Society 2009

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