Toughening through multilayering in TiN–AlTiN films

Autor:	S. J. Suresha, Vikram Jayaram, S.K. Biswas, Souvik Math
Rok vydání:	2007
Předmět:	Toughness Materials science Materials Research Centre Mechanical Engineering Materials Engineering (formerly Metallurgy) Plasticity Condensed Matter Physics Focused ion beam Fracture toughness Indentation Deformation (engineering) Thin film Composite material Elastic modulus
Zdroj:	Philosophical Magazine. 87:2521-2539
ISSN:	1478-6443 1478-6435
Popis:	The damage response of columnar multilayers of TiN and AlTiN to Vickers indentation is studied through focused ion beam machining and elastic modelling. Multilayers display an enhanced resistance, which increases with layer refinement, to the multiple fracture modes that appear at high loads in these materials, including edge (nested) cracks and inclined shear cracks. Measurements of layer thickness reveal that multilayers display additional modes of plastic deformation that lead to permanent compression and bending of the film. An elastic model of contact deformation in a bilayer where plasticity is mimicked by greatly enhanced elastic compliance of the film is used to rationalize the trends in crack resistance. It is shown that the enhanced toughness is not due to any increase in the strain capacity (hardness/modulus) of the film material, brought about by multilayering.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a9830cc8103e9bbc9599b33131d6b1e https://doi.org/10.1080/14786430701230245 Zobrazit plný text záznamu