Macroscopic elastic properties of textured ZrN-AlN polycrystalline aggregates: From ab initio calculations to grainscale interactions [Elektronisk resurs]
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Holec, D. (författare)
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Tasnadi, Ferenc (författare)
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Wagner, P. (författare)
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Friak, M. (författare)
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Neugebauer, J. (författare)
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Mayrhofer, P. H. (författare)
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Keckes, J. (författare)
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- Linköpings universitet Institutionen för fysik, kemi och biologi (utgivare)
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Alternativt namn: Linköpings universitet. Institutionen för fysik och mätteknik
(tidigare namn)
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Alternativt namn: Linköpings universitet. Institutionen för fysik och mätteknik, biologi och kemi
(tidigare namn)
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Alternativt namn: IFM
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Alternativt namn: Engelska : Department of Physics and Measurement Technology, Biology and Chemistry
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Alternativt namn: Engelska : Department of Physics, Chemistry and Biology
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- Linköpings universitet Tekniska högskolan (utgivare)
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Alternativt namn: Linköpings universitet. Tekniska fakulteten
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Alternativt namn: Linköpings tekniska högskola
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Alternativt namn: Tekniska högskolan vid Linköpings universtiet
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Alternativt namn: LiTH
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Alternativt namn: Linköping University. Institute of Technology
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Se även: Universitet i Linköping Tekniska högskolan
- American Physical Society 2014
- Engelska.
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121. ; 90:18, 184106
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Sammanfattning
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- 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.
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- Natural Sciences (hsv)
- Physical Sciences (hsv)
- Naturvetenskap (hsv)
- Fysik (hsv)
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