Mechanical Behavior of Nano-crystalline Metallic Thin Films and Multilayers Under Microcompression

Wang,J, Yang,C and Hodgson,PD 2015, Mechanical Behavior of Nano-crystalline Metallic Thin Films and Multilayers Under Microcompression, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, doi: 10.1007/s11661-014-2715-1.

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Title Mechanical Behavior of Nano-crystalline Metallic Thin Films and Multilayers Under Microcompression
Author(s) Wang,JORCID iD for Wang,J orcid.org/0000-0002-8171-6291
Yang,C
Hodgson,PD
Journal name Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Publisher Springer
Publication date 2015
ISSN 1073-5623
Summary Microcompression tests were performed to determine the mechanical behavior of nano-crystalline Cu/Fe and Fe/Cu multilayers, as well as monolithic Cu and Fe thin films. The results show that the micropillars of pure Cu thin film bulge out under large compressive strains without failure, while those of pure Fe thin film crack near the top at low compressive strains followed by shear failure. For Cu/Fe and Fe/Cu multilayers, the Cu layers accommodate the majority of plastic deformation, and the geometry constraints imposed by Fe layers exaggerates the bulging in the Cu layers. However, the existence of ductile Cu layers does not improve the overall ductility of Cu/Fe and Fe/Cu multilayers. Cracking in the Fe layers directly lead to the failure of the multilayer micropillars, although the Cu layers have very good ductility. The results imply that suppressing the cracking of brittle layers is more important than simply adding ductile layers for improving the overall ductility of metallic multilayers.
Language eng
DOI 10.1007/s11661-014-2715-1
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Grant ID Peter Hodgson - ARC Laureate Fellowship
Copyright notice ©2015, Springer Verlag
Persistent URL http://hdl.handle.net/10536/DRO/DU:30069197

Document type: Journal Article
Collections: Institute for Frontier Materials
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