Observations of dislocations in Cu/Nb nanolayer composites after deformation

Journal Article · Fri Aug 01 00:00:00 EDT 1997 · Journal of Materials Research

DOI:https://doi.org/10.1557/JMR.1997.0264· OSTI ID:565531

Lu, Y; Kung, H; Griffin, Jr, A J; Nastasi, M A; Mitchell, T E ^[1]

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1. Center for Materials Science, Materials Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

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. {copyright} {ital 1997 Materials Research Society.}

• OSTI ID: 565531
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 8 Vol. 12; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
COPPER
DEFORMATION
DISLOCATIONS
INTERFACES
MECHANICAL PROPERTIES
NIOBIUM
RESIDUAL STRESSES