Nature of contact deformation of TiN films on steel

Bhowmick, S. ; Xie, Z-H. ; Hoffman, M. ; Jayaram, V. ; Biswas, S. K. (2004) Nature of contact deformation of TiN films on steel Journal of Materials Research, 19 (9). pp. 2616-2624. ISSN 0884-2914

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Nanoindentation experiments were carried out on a columnar ~1.5-μm-thick TiN film on steel using a conical indenter with a 5-μm tip radius. Microstructural examination of the contact zone indicates that after initial elastic deformation, the deformation mechanism of the TiN is dominated by shear fracture at inter-columnar grain boundaries of the TiN film. A simple model is proposed whereby the applied load is partitioned between a deforming TiN annulus and a central expanding cavity in the steel substrate. It is possible to obtain a good fit to the experimental load-displacement curves with only one adjustable parameter, namely the inter-columnar shear fracture stress of the TiN film. The implication of results in the context of the performance of TiN films in service is also discussed.

Item Type:Article
Source:Copyright of this article belongs to Materials Research Society.
ID Code:13572
Deposited On:12 Nov 2010 15:19
Last Modified:04 Jun 2011 07:07

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