Journal
SURFACE & COATINGS TECHNOLOGY
Volume 308, Issue -, Pages 414-417Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2016.06.093
Keywords
Multilayered TiN/CrN coatings; Small scale fracture behaviour; Layer architecture; Bilayer period; Micro-cantilevers
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TiN/CrN multilayered PVD coatings are known to exhibit outstanding micromechanical properties and wear resistance. On the other hand, information on their small scale fracture behaviour is rather scarce. The present work aims to address it by testing to failure FIB-milled microbeams of multilayer TiN/CrN systems with different bilayer periods (8, 19 and 25 nm). In doing so, these micrometric specimens are first FIB notched, and thus deflected by means of a nanoindentation system. It is found that multilayer architecture translates into a beneficial synergic effect regarding critical load for reaching unstable failure; and thus, on energy absorption at fracture. Such behaviour is associated with small scale crack deflection as main toughening mechanism. (C) 2016 Elsevier B.V. All rights reserved.
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