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Microsc Microanal. 2012 Oct;18(5):1155-62. doi: 10.1017/S143192761200133X. Epub 2012 Oct 16.

Direct observations of confined layer slip in Cu/Nb multilayers.

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  • 1Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. nanli@lanl.gov

Abstract

In situ nanoindentation of a 30 nm Cu/20 nm Nb multilayer film in a transmission electron microscope revealed confined layer slip as the dominant deformation mechanism. Dislocations were observed to nucleate from the Cu-Nb interfaces in both layers. Dislocation glide was confined by interfaces to occur within each layer, without transmission across interfaces. Cu and Nb layers co-deformed to large plastic strains without cracking. These microscopy observations provide insights in the unit mechanisms of deformation, work hardening, and recovery in nanoscale metallic multilayers.

PMID:
23072907
[PubMed]
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