Contact deformation of TiN coatings on metallic substrates

Jayaram, V and Bhowmick, S and Xie, ZH and Math, S and Hoffman, M and Biswas, SK (2006) Contact deformation of TiN coatings on metallic substrates. In: Materials Science and Engineering: A, 423 (1-2). 08-13.

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Abstract

Recent developments in the contact deformation and fracture of columnar TiN coatings are reviewed. It is shown that columnar films display two regimes of responses: one dominated by columnar sliding at a critical shear stress which is determined substantially by the residual stress in the film, and the other, more damaging response, characterized by fracture. The transition to cracking modes of response is aided by a soft substrate and a thick film and can be understood from a relative comparison of the driving forces for the different modes by analytically simulating the response of an elastic bi-layer to Hertzian loading. The above comparison suggests that the relative success of columnar films, vis-A-vis amorphous or equi-axed films, is probably due to the existence of this relatively benign mode of columnar shear. The implications for optimal coating design are also discussed.

Item Type:	Journal Article
Publication:	Materials Science and Engineering: A
Publisher:	Elsavier
Additional Information:	Copyright of this article belongs to Elsavier.
Keywords:	thin films; columnar coatings; TiN; indentation; modeling;Load-Displacement Curves; Wear-Resistant Coatings; Thin-Films; Mechanical-Properties; Fracture; Indentation; Hardness; Nanoindentation; Indenters; Steel
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	14 Mar 2009 11:35
Last Modified:	19 Sep 2010 04:54
URI:	http://eprints.iisc.ac.in/id/eprint/16996

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