Verma, Nisha and Jayaram, Vikram (2013) Detailed investigation of contact deformation in ZrN/Zr multiplayer-understanding the role of volume fraction, bilayer spacing, and morphology of interfaces. In: JOURNAL OF MATERIALS RESEARCH, 28 (22). pp. 3146-3156.
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A systematic study was done to understand the influence of volume fractions and bilayer spacings for metal/nitride multilayer coating using finite element method (FEM). An axisymmetric model was chosen to model the real situation by incorporating metal and substrate plasticity. Combinations of volume fractions and bilayer spacings were chosen for FEM analysis consistent with experimental results. The model was able to predict trends in cracking with respect to layer spacing and volume fraction. Metal layer plasticity is seen to greatly influence the stress field inside nitride. It is seen that the thicker metal induces higher tensile stresses inside nitride and hence leads to lower cracking loads. Thin metal layers < 10 nm were seen to have curved interfaces, and hence, the deformation mode was interfacial delamination in combination with edge cracking. There is an optimum seen with respect to volume fraction similar to 13% and metal layer thickness similar to 30 nm, which give maximum crack resistance.
| Item Type: | Journal Article |
|---|---|
| Publication: | JOURNAL OF MATERIALS RESEARCH |
| Publisher: | CAMBRIDGE UNIV PRESS |
| Additional Information: | Copyright for this article belongs to CAMBRIDGE UNIV PRESS,USA |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 23 Jan 2014 05:39 |
| Last Modified: | 23 Jan 2014 05:39 |
| URI: | http://eprints.iisc.ac.in/id/eprint/48221 |
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