Metallurgical and Materials Transactions A

, Volume 46, Issue 3, pp 1405–1412 | Cite as

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

Article
First Online:

Abstract

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.

Keywords

High Yield Stress Brittle Layer Flat Punch Geometry Constraint Constituent Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

The authors would like to acknowledge the financial support from the Australian Research Council through the Laureate Fellowship for P.D. Hodgson.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Jiangting Wang
    • 1
  • Chunhui Yang
    • 2
  • Peter D. Hodgson
    • 1
  1. 1.Institute for Frontier MaterialsDeakin UniversityGeelongAustralia
  2. 2.School of Computing, Engineering and MathematicsUniversity of Western SydneyPenrithAustralia

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