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Observations of Dislocations in Cu/Nb Nanolayer Composites After Deformation

Published online by Cambridge University Press:  31 January 2011

Y-C. Lu ,
H. Kung ,
A. J. Griffin Jr ,
M. A. Nastasi  and
T. E. Mitchell
Y-C. Lu
Affiliation:
Center for Materials Science, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
H. Kung
Affiliation:
Center for Materials Science, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
A. J. Griffin Jr
Affiliation:
Center for Materials Science, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
M. A. Nastasi
Affiliation:
Center for Materials Science, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
T. E. Mitchell
Affiliation:
Center for Materials Science, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

Dislocations have been observed in deformed Cu/Nb nanolayer composites of wavelength 17 and 7 nm. The dislocations thread through the Cu/Nb interfaces even though there is a change of Burgers vector. Conventional and high resolution transmission electron microscopy studies show that the in-plane bowing direction of these dislocations in the Cu layers is opposite to that in the Nb layers, so that the dislocations appear to zig-zag. These observations are explained by the presence of residual tensile stresses in Cu and residual compressive stresses in Nb, which make dislocations bow in opposite directions in the alternating layers.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 8 , August 1997 , pp. 1939 - 1941
Copyright
Copyright © Materials Research Society 1997

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