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  Stress-dependent elasticity of TiAlN coatings

Hans, M., Patterer, L., Mušić, D., Holzapfel, D. M., Evertz, S., Schnabel, V., et al. (2019). Stress-dependent elasticity of TiAlN coatings. Coatings, 9(1): 24. doi:10.3390/coatings9010024.

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coatings-09-00024-v2.pdf (Supplementary material), 9MB
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2019
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 Creators:
Hans, Marcus1, Author              
Patterer, Lena2, Author              
Mušić, Denis3, Author              
Holzapfel, Damian M.4, Author              
Evertz, Simon1, Author              
Schnabel, Volker1, Author              
Stelzer, Bastian5, Author              
Primetzhofer, Daniel6, Author              
Völker, Bernhard7, 8, Author              
Widrig, Beno9, Author              
Eriksson, Anders O.9, Author              
Ramm, Jürgen9, Author              
Arndt, Mirjam9, Author              
Rudigier, Helmut10, Author              
Schneider, Jochen Michael11, Author              
Affiliations:
1Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, Aachen, Germany, ou_persistent22              
2Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, 52074 Aachen, Germany, ou_persistent22              
3Materials Chemistry, RWTH Aachen University, D-52056 Aachen, Germany, ou_persistent22              
4Materials Chemistry, RWTH Aachen University, Kopernikusstr. 10, D-52074 Aachen, Germany, ou_persistent22              
5Materials Chemistry, RWTH Aachen University, D-52074, Aachen, Germany, ou_persistent22              
6Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden, ou_persistent22              
7Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863398              
8Materials Chemistry, RWTH Aachen University, Aachen, Germany, ou_persistent22              
9Oerlikon Surface Solutions AG, Oerlikon Balzers, Iramali 18, 9496 Balzers, Liechtenstein, ou_persistent22              
10Oerlikon Surface Solutions AG, Oerlikon Balzers, Churer Str. 120, 8808 Pfäffikon, Switzerland, ou_persistent22              
11Materials Chemistry, Lehrstuhl für Werkstoffchemie, RWTH Aachen, Germany, ou_persistent22              

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 Abstract: We investigate the effect of continuous vs. periodically interrupted plasma exposure during cathodic arc evaporation on the elastic modulus as well as the residual stress state of metastable cubic TiAlN coatings. Nanoindentation reveals that the elastic modulus of TiAlN grown at floating potential with continuous plasma exposure is 7-11 larger than for coatings grown with periodically interrupted plasma exposure due to substrate rotation. In combination with X-ray stress analysis, it is evident that the elastic modulus is governed by the residual stress state. The experimental dependence of the elastic modulus on the stress state is in excellent agreement with ab initio predictions. The macroparticle surface coverage exhibits a strong angular dependence as both density and size of incorporated macroparticles are significantly lower during continuous plasma exposure. Scanning transmission electron microscopy in combination with energy dispersive X-ray spectroscopy reveals the formation of underdense boundary regions between the matrix and TiN-rich macroparticles. The estimated porosity is on the order of 1 and a porosity-induced elastic modulus reduction of 5-9 may be expected based on effective medium theory. It appears reasonable to assume that these underdense boundary regions enable stress relaxation causing the experimentally determined reduction in elastic modulus as the population of macroparticles is increased. © 2018 by the authors.

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Language(s): eng - English
 Dates: 2019-01-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3390/coatings9010024
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Title: Coatings
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: - Volume / Issue: 9 (1) Sequence Number: 24 Start / End Page: - Identifier: ISSN: 2079-6412
CoNE: https://pure.mpg.de/cone/journals/resource/2079-6412