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Macroscopic elastic properties of textured ZrN-AlN polycrystalline aggregates: From ab initio calculations to grainscale interactions
Mt University of Leoben, Austria.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
Mt University of Leoben, Austria.
Max Planck Institute Eisenforsch GmbH, Germany; Academic Science Czech Republic, Czech Republic.
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2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 90, no 18, 184106- p.Article in journal (Refereed) Published
Abstract [en]

Despite the fast development of computational material modeling, the theoretical description of macroscopic elastic properties of textured polycrystalline aggregates starting from basic principles remains a challenging task. In this study we use a supercell-based approach to obtain the elastic properties of a random solid solution cubic Zr1-x Al-x N system as a function of the metallic sublattice composition and texture descriptors. The employed special quasirandom structures are optimized not only with respect to short-range-order parameters, but also to make the three cubic directions [1 0 0], [0 1 0], and [0 0 1] as similar as possible. In this way, only a small spread of elastic constant tensor components is achieved and an optimum trade-off between modeling of chemical disorder and computational limits regarding the supercell size and calculational time is proposed. The single-crystal elastic constants are shown to vary smoothly with composition, yielding x approximate to 0.5 an alloy constitution with an almost isotropic response. Consequently, polycrystals with this composition are suggested to have Youngs modulus independent of the actual microstructure. This is indeed confirmed by explicit calculations of polycrystal elastic properties, both within the isotropic aggregate limit and with fiber textures with various orientations and sharpness. It turns out that for low AlN mole fractions, the spread of the possible Youngs modulus data caused by the texture variation can be larger than 100 GPa. Consequently, our discussion of Youngs modulus data of cubic Zr1-x Al-x N contains also the evaluation of the texture typical for thin films.

Place, publisher, year, edition, pages
American Physical Society , 2014. Vol. 90, no 18, 184106- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-114447DOI: 10.1103/PhysRevB.90.184106ISI: 000348766500001OAI: oai:DiVA.org:liu-114447DiVA: diva2:789916
Note

Funding Agencies|CPU time at the Vienna Scientific Cluster; Academy of Sciences of the Czech Republic; CERIT-SC under the program Centre CERIT Scientific Cloud, part of the Operational Program Research and Development for Innovations [CZ.1.05/3.2.00/08.0144]; START Program of the Austrian Science Fund (FWF) [Y371]; MetaCentrum [LM2010005]

Available from: 2015-02-20 Created: 2015-02-20 Last updated: 2017-12-04

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Tasnadi, Ferenc

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