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

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Abstract

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.

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Authors and Affiliations

  1. Materials Science and Engineering Department, Northwestern University, Evanston, IL, 60208, USA

    P. G. Sanders & J. R. Weertman

  2. National Institute of Standards and Technology (NIST), Cold Neutron Research Facility, Gaithersburg, MD, 20899, USA

    J. G. Barker

  3. Argonne National Laboratory, Materials Science Division, Argonne, IL, 60439, USA

    R. W. Siegel

Authors
  1. P. G. Sanders
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  2. J. R. Weertman
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  3. J. G. Barker
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  4. R. W. Siegel
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Sanders, P.G., Weertman, J.R., Barker, J.G. et al. Small Angle Neutron Scattering from Nanocrystalline Pd and Cu Compacted at Elevated Temperatures. MRS Online Proceedings Library 351, 319–324 (1994). https://doi.org/10.1557/PROC-351-319

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  • DOI: https://doi.org/10.1557/PROC-351-319

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