A description of the composite elastic modulus of multilayer coated systems

THIN SOLID FILMS

卷:583

Article

Puchi-Cabrera, E. S.^1,2,3  Staia, M. H.^1,2,4  Iost, A.⁴ 

[1] Cent Univ Venezuela, Fac Engn, Sch Met Engn & Mat Sci, Caracas 1040, Venezuela

[2] Venezuelan Natl Acad Engn & Habitat, Caracas 1010, Venezuela

[3] Univ Lille Nord France, USTL, LML, CNRS,UMR 8107, F-59650 Villeneuve Dascq, France

[4] Arts & Metiers ParisTech, MSMP, Ctr Lille, F-59000 Lille, France

关键词: Elastic modulus;    Penetration depth;    Multilayer coatings;    Nanoindentation testing;   

DOI  :  10.1016/j.tsf.2015.02.078

来源: Elsevier

【 摘 要 】

The evaluation of the elastic response of coated systems under indentation loading represents a crucial issue, which determines the behavior of such systems under tribological applications. Although a number of models have been proposed in the literature for the description of the change in the compositemoduluswith indentation depth, as well as for the determination of the elasticmodulus of monolayer coatings, only fewworks address the analysis ofmultilayer coatings. The presentwork proposes a generalmethodology, which allows themodification and extension of themodels employed in the analysis of monolayer coatings, for the study of the elastic response of multilayer coatings. For this purpose, a number of models have been examined, including those proposed by Gao et al., Mencik et al., Perriot and Barthel, Antunes et al., Korsunsky and Constantinescu, Doerner and Nix, Bec et al. and Bull. The foundation of the advanced formalism is the physically-based concept proposed by Iost et al. for the computation of the volume fraction of each layer in the coating and therefore, of its contribution to the global elastic response under indentation. The modified models are further employed in the analysis of a coated system composed of a 2024-T6 aluminum alloy substrate coated with a multilayer coating of DLC/CrC/CNiPCr/NiP of approximately 54 mu m in thickness, as well as, a set of experimental data reported by Bull for a bilayer coated system. It has been shown that the different models analyzed are able to provide a satisfactory description of the experimental data, although the quality of the fit depends on the number of material parameters involved in each model. Themean square error of the fit is employed for conducting a comparison between the models. (C) 2015 Elsevier B.V. All rights reserved.

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