Small scale fracture behaviour of multilayer TiN/CrN systems: Assessment of bilayer thickness effects by means of ex-situ tests on FIB-milled micro-cantilevers

SURFACE & COATINGS TECHNOLOGY

卷:308

Article; Proceedings Paper

Roa, J. J.^1,2  Rodriguez, R.^3,4  Lamelas, V.¹  Martinez, R.^4,5  Jimenez-Pique, E.^1,2  Llanes, L.^1,2 

[1] Univ Politecn Catalunya EEBE, CIEFMA Dept Ciencia Mat & Engn Met Lurg, Barcelona 08019, Spain

[2] Univ Politecn Cataluna, CRnE, Barcelona 08019, Spain

[3] Univ Publ Navarra, IMEM Dept, Campus Arrosadias N, Pamplona 31006, Spain

[4] Univ Publ Navarra, Inst Adv Mat INAMAT, Campus Arrosadia S-N, Pamplona 31006, Spain

[5] Asociac Ind Navarra, Ctr Ingn Avanzada & Superficies, Cordovilla 31191, Spain

关键词: Multilayered TiN/CrN coatings;    Small scale fracture behaviour;    Layer architecture;    Bilayer period;    Micro-cantilevers;   

DOI  :  10.1016/j.surfcoat.2016.06.093

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free