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An in Situ Small Angle Neutron Scattering Investigation of Ag0.7Au0.3 Dealloying Under Potential Control

Published online by Cambridge University Press:  10 February 2011

Sean G. Corcoran ,
David G. Wiesler  and
Karl Sieradzki
Sean G. Corcoran
Affiliation:
Hysitron, Inc., 2010 E. Hennepin Avenue, Minneapolis, MN 55413
David G. Wiesler
Affiliation:
Laboratory of Cardiac Energetics, National Heart, Lung, and Blood Institute, 4420 Rosedale Avenue, NIH Bldg. 10, Bethesda, MD 20892
Karl Sieradzki
Affiliation:
Arizona State University, Department of Mechanical and Aerospace Engineering, Tempe, AZ 85287
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Abstract

In situ small angle neutron scattering (SANS) was used to characterize the formation of the random 3-dimensional porous structure created during the dealloying of a Ag0.7Au0.3 alloy under potential control. Using a model developed by N.F. Berk (Phys. Rev. Lett., 58 (1987) 2718) for the scattering properties of random porous media, we were able to characterize the average ligament width as a function of time during the dealloying process. We find that the coarsening of the average ligament width is strongly dependent upon the value of the applied potential. Our results represent the first in situ nanoscale characterization of the 3-dimensional formation of porosity in a dealloying system under potential control.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 451: Symposium P – Electrochemical Synthesis and Modification , 1996 , 93
Copyright
Copyright © Materials Research Society 1997

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References

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