Deconvolution of fracture properties of TiN films on steels from nanoindentation load-displacement curves

Bhowmick, S and Jayaram, V and Biswas, SK (2005) Deconvolution of fracture properties of TiN films on steels from nanoindentation load-displacement curves. In: Acta Materialia, 53 (8). pp. 2459-2467.

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Abstract

A columnar TiN film under contact loading fails by shear fracture along inter-columnar boundaries. To deconvolute inter-columnar fracture strength from load-displacement curves, nanoindentation experiments were carried out on columnar similar to 1.4 \mu m thick TiN films deposited on steels of various hardness, using a Berkovich indenter. A model, which is developed based on the shear-fracture driven deformation of the coating, is applied to the load-displacement curves to obtain inter-columnar fracture strength. The correlation between the fracture strength, biaxial residual stress and substrate yield stressis outlined. The result suggests that the presence of a high compressive residual stress substantially improves the shear fracturestrength of a columnar TiN film.

Item Type:	Journal Article
Publication:	Acta Materialia
Publisher:	Pergamon-Elsevier Science Ltd
Additional Information:	Copyright for this article belongs to Elsevier.
Keywords:	TiN films;Nanoindentation;Shear fracture;Residual stress
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	02 Jun 2005
Last Modified:	19 Sep 2010 04:19
URI:	http://eprints.iisc.ac.in/id/eprint/3273

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