Strain gradients in Cu-Fe thin films and multilayers during micropillar compression

Wang, Jiangting, Yang, Chunhui and Hodgson, Peter D. 2016, Strain gradients in Cu-Fe thin films and multilayers during micropillar compression, Materials science and engineering: A, vol. 651, pp. 146-154, doi: 10.1016/j.msea.2015.10.105.

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Title Strain gradients in Cu-Fe thin films and multilayers during micropillar compression
Author(s) Wang, JiangtingORCID iD for Wang, Jiangting
Yang, Chunhui
Hodgson, Peter D.
Journal name Materials science and engineering: A
Volume number 651
Start page 146
End page 154
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-01-10
ISSN 0921-5093
Keyword(s) Science & Technology
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Science & Technology - Other Topics
Materials Science
Strain gradient
Thin film
Summary Plastic strain gradients can influence the work-hardening behaviour of metals due to the accumulation of geometrically necessary discolations at the micron/submicron scale. A finite element model based on the conventional theory of mechanism-based strain-gradient plasticity has been developed to simulate the micropillar compression of Cu–Fe thin films and multilayers. The modelling results show that the geometric constraints lead to inhomogeneous deformation in the Cu layers, which agrees well with the bulging of Cu layers observed experimentally. Plastic strain gradients develop inside the individual layers, leading to extra work-hardening due to the accumulation of geometrically necessary dislocations. In the multilayer specimens, the Cu layers deform more severely than the Fe layers, resulting in the development of tensile stresses in the Fe layers. It is proposed that these tensile stresses are responsible for the development of micro-cracks in the Fe layers.
Language eng
DOI 10.1016/j.msea.2015.10.105
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
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
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Document type: Journal Article
Collections: Institute for Frontier Materials
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