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Mechanical properties of nanocrystalline copper produced by solution-phase synthesis

Published online by Cambridge University Press:  31 January 2011

R. Suryanarayanan ,
Claire A. Frey ,
Shankar M. L. Sastry ,
Benjamin E. Waller ,
Susan E. Bates  and
William E. Buhro
R. Suryanarayanan
Affiliation:
Materials Science and Engineering Program, Department of Mechanical Engineering, Washington University, St. Louis, Missouri 63130–4899
Claire A. Frey
Affiliation:
Materials Science and Engineering Program, Department of Mechanical Engineering, Washington University, St. Louis, Missouri 63130–4899
Shankar M. L. Sastry
Affiliation:
Materials Science and Engineering Program, Department of Mechanical Engineering, Washington University, St. Louis, Missouri 63130–4899
Benjamin E. Waller
Affiliation:
Department of Chemistry, Washington University, St. Louis, Missouri 63130–4899
Susan E. Bates
Affiliation:
Department of Chemistry, Washington University, St. Louis, Missouri 63130–4899
William E. Buhro
Affiliation:
Department of Chemistry, Washington University, St. Louis, Missouri 63130–4899
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Abstract

Nanocrystalline copper powder was produced by a NaBH4 reduction of CuCl in a simple solution phase room temperature reaction. Uniaxial hot pressing in a closed tungsten die was used to compact powder into dense specimens. Samples were analyzed by x-ray diffraction, precision densitometry, electron microscopy, energy dispersive x-ray analysis, and selected area diffraction. Mechanical properties of the consolidated samples were determined by microhardness measurements, three-point bending of rectangular specimens, and compression tests. Yield strength measured for nanocrystalline Cu in the present work was over two times that reported in literature for Cu with comparable grain size and over five times that of conventional Cu. Restricted grain growth observed in the hot-pressed samples and improved mechanical properties are attributed to the presence of boron. A unique method of obtaining homogeneous in situ nanosized reinforcements to strengthen the grain boundaries in nanocrystalline materials is identified.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 2 , February 1996 , pp. 439 - 448
Copyright
Copyright © Materials Research Society 1996

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