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  Mapping the mechanical properties in nitride coatings at the nanometer scale

Zhang, Z., Chen, Z., Holec, D., Liebscher, C., Koutná, N., Bartosik, M., et al. (2020). Mapping the mechanical properties in nitride coatings at the nanometer scale. Acta Materialia, 194, 343-353. doi:10.1016/j.actamat.2020.04.024.

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Mapping the mechanical properties in nitride coatings at the nanometer scale _ Elsevier Enhanced Reader.pdf (Publisher version), 6MB
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Mapping the mechanical properties in nitride coatings at the nanometer scale _ Elsevier Enhanced Reader.pdf
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2020
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Acta Materialia Inc. Published by Elsevier Ltd.

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 Creators:
Zhang, Zaoli1, Author              
Chen, Zhuo1, Author
Holec, David2, Author              
Liebscher, Christian3, Author              
Koutná, Nikola4, Author              
Bartosik, Matthias5, Author              
Zheng, Yonghui1, Author              
Dehm, Gerhard6, Author              
Mayrhofer, Paul Heinz5, Author              
Affiliations:
1Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria, ou_persistent22              
2Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria, ou_persistent22              
3Advanced Transmission Electron Microscopy, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863399              
4Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, Vienna, A-1060, Austria, ou_persistent22              
5Institute of Materials Science and Technology, Vienna University of Technology, Vienna, Austria, ou_persistent22              
6Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863398              

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Free keywords: Aluminum nitride; Chromium compounds; Density functional theory; Elastic moduli; Electron spectroscopy; Electronic structure; Electrons; III-V semiconductors; Mapping; Multilayers; Oxygen; Zinc sulfide, Chemical compositions; Constant thickness; Experimental analysis; Gradient structure; Inner-shell electrons; Multi-layered structure; Theoretical calculations; Wurtzite structure, Nitrogen compounds
 Abstract: We report on a multilayered structure comprising of rock-salt (rs) structured CrN layers of constant thickness and AlN layers of varying thicknesses, which surprisingly enables the growth of metastable zinc-blende (zb) AlN layers for certain layer-thickness combinations. The multilayer exhibits an atomic and electronic structure gradient as revealed using advanced electron microscopy and electron spectroscopy. Gradient structures are also accompanied by a modulation of the chemical compositions. A combined experimental analysis based on valence electrons and inner shell electrons allowed mapping the mechanical properties of the multilayer at the nanometer scale and further unveiled the effect of oxygen impurities on the bulk modulus. We found that the presence of oxygen impurities causes a remarkable reduction of the bulk modulus of rs-CrN while having no significant effect on the bulk modulus of the stable wurtzite structure wz-AlN layers. The findings are unambiguously validated by theoretical calculations using density functional theory. © 2020 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2020-08-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.actamat.2020.04.024
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 194 Sequence Number: - Start / End Page: 343 - 353 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100