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Contact damage evolution in diamondlike carbon coatings on ductile substrates

Published online by Cambridge University Press:  31 January 2011

Rajnish K. Singh ,
M.T. Tilbrook ,
Z.H. Xie ,
A. Bendavid ,
P.J. Martin ,
P. Munroe  and
M. Hoffman
Rajnish K. Singh*
Affiliation:
School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia
M.T. Tilbrook
Affiliation:
School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia
Z.H. Xie
Affiliation:
School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia
A. Bendavid
Affiliation:
Commonwealth Scientific and Industrial Research Organization (CSIRO) Industrial Physics, Lindfield, NSW 2070, Australia
P.J. Martin
Affiliation:
Commonwealth Scientific and Industrial Research Organization (CSIRO) Industrial Physics, Lindfield, NSW 2070, Australia
P. Munroe
Affiliation:
School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia
M. Hoffman
Affiliation:
School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia
*
a)Address all correspondence to this author. e-mail: Rajnish.Singh@gmail.com
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Abstract

A diamondlike carbon (DLC) thin film was deposited onto a stainless steel substrate using a plasma-enhanced chemical vapor deposition (PECVD) process. Nanoindentation, coupled with focused-ion-beam (FIB) milling, was used to investigate contact-induced deformation and fracture in this coating system. Following initial elastic contact between the coating and the indenter and apparent plastic yield of the substrate, pop-ins were observed in the load–displacement curve, indicative of coating fracture. However, FIB cross-sectional images of indentations revealed the presence of ring, radial, and lateral cracks at loads much lower than the critical load for the first observed pop-ins. Finite element modeling was used, and the properties of the substrate and the film were calibrated by fitting the simulated load–displacement curves to experimental data. Then, based upon the experimental observations of damage evolution in this coating system, the stress distributions relevant to initiate ring, radial, and lateral cracks in the coating were ascertained. Furthermore, the effects of substrate yield stress and coating residual stress on the formation of these cracks were investigated.

Keywords

DiamondIon beam analysisThin film
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 27 - 36
Copyright
Copyright © Materials Research Society 2008

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