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Small Angle Neutron Scattering from Nanocrystalline Pd and Cu Compacted at Elevated Temperatures

Published online by Cambridge University Press:  15 February 2011

P.G. Sanders ,
J.R. Weertman ,
J.G. Barker  and
R.W. Siegel
P.G. Sanders
Affiliation:
Northwestern University, Materials Science and Engineering Department, Evanston, IL 60208
J.R. Weertman
Affiliation:
Northwestern University, Materials Science and Engineering Department, Evanston, IL 60208
J.G. Barker
Affiliation:
National Institute of Standards and Technology (NIST), Cold Neutron Research Facility, Gaithersburg, MD 20899
R.W. Siegel
Affiliation:
Argonne National Laboratory, Materials Science Division, Argonne, IL 60439

Abstract

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Nanocrystalline (n-) Cu and Pd, prepared by inert gas condensation (IGC) and in situ room temperature (RT) and elevated temperature (warm) compactions, have been studied by small angle neutron scattering (SANS). Previous work [1] on room temperature compacted and subsequently annealed n-Pd seemed to show that all the scattering could be accounted for by a distribution of pores. Analysis of more extensive SANS measurements, together with the results of prompt gamma activation analysis (PGAA), indicates that the SANS can be explained by the presence of pores and hydrogen. Warm compaction reduces the hydrogen impurity level, while increasing the bulk density and decreasing the pore size. This can lead to a dramatic hardness increase in these materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 319
Copyright
Copyright © Materials Research Society 1994

References

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