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

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
53
Issue
8
Identifiers
DOI: 10.1016/j.actamat.2005.02.008
Keywords
  • Tin Films
  • Nanoindentation
  • Shear Fracture
  • Residual Stress

Abstract

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 ∼1.4 μm 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 stress is outlined. The result suggests that the presence of a high compressive residual stress substantially improves the shear fracture strength of a columnar TiN film.

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