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Nano/micro mechanics study of nanoindentation on thin Al/Pd films

Published online by Cambridge University Press:  05 February 2015

Tania Vodenitcharova ,
Yi Kong ,
Luming Shen ,
Pranesh Dayal  and
Mark Hoffman
Tania Vodenitcharova*
Affiliation:
School of Materials Science and Engineering, UNSW Australia, Sydney, NSW 2052, Australia
Yi Kong
Affiliation:
School of Civil Engineering, The University of Sydney, NSW 2006, Australia; and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Luming Shen
Affiliation:
School of Civil Engineering, The University of Sydney, NSW 2006, Australia
Pranesh Dayal
Affiliation:
School of Materials Science and Engineering, UNSW Australia, Sydney, NSW 2052, Australia
Mark Hoffman
Affiliation:
School of Materials Science and Engineering, UNSW Australia, Sydney, NSW 2052, Australia
*
a)Address all correspondence to this author. e-mail: Tania.V@unsw.edu.au
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Abstract

The finite element method is used to simulate indentation with a 100 nm spherical indenter on Al/Pd multilayer thin films and Al and Pd monolayer thin films. The elastic/plastic properties of bulk Al and Pd and the material formulation are obtained by molecular dynamics simulations of tensile and indentation loadings. Hill's plasticity with isotropic hardening is found to best represent the stress–strain response of both bulk Al and Pd. The Pd monolayers appear the hardest and the Al monolayers the softest. The indentation hardness of both monolayered and multilayered films is found to increase with the indentation depth and appears independent of the layer order and thickness in the multilayer films. The hardness values determined by the finite element method simulations are close to those obtained using the well-known formula of Field and Swain. No hardness enhancement in very thin multilayered films (3–5 nm per layer) is evident, in contrast to experimental reports.

Keywords

multilayer thin filmsnanoindentationhardnessmolecular dynamicsfinite element analysis
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 5 , 14 March 2015 , pp. 699 - 708
Copyright
Copyright © Materials Research Society 2015 

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References

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