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First-principles based calculation of binary and multicomponent phase diagrams for titanium carbonitride
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen. (Condensed Matter Theory Group)
2008 (engelsk)Inngår i: Calphad, ISSN 0364-5916, E-ISSN 1873-2984, Vol. 32, nr 3, s. 543-565Artikkel, forskningsoversikt (Fagfellevurdert) Published
Abstract [en]

In this paper we have used a combined first principles and Calphad approach to calculate phase diagrams in the titanium-carbon-nitrogen system, with particular focus on the vacancy-induced ordering of the substoichiometric carbonitride phase, TiCxNy (x + y <= 1). Results from earlier Monte Carlo simulations of the low-temperature binary phase diagrams are used in order to formulate sublattice models for TiCxNy within the compound energy formalism (CEF) that are capable of describing both the low temperature ordered and the high-temperature disordered state. We parameterize these models using first-principles calculations and then we demonstrate how they can be merged with thermodynamic descriptions of the remaining Ti-C-N phases that are derived within the Calphad method by fitting model parameters to experimental data. We also discuss structural and electronic properties of the ordered end-member compounds, as well as short range order effects in the TiCxNy phase.

sted, utgiver, år, opplag, sider
2008. Vol. 32, nr 3, s. 543-565
Emneord [en]
First-principles calculations, CALPHAD, Titanium carbonitride, Order-disorder reactions, Phase diagrams
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Identifikatorer
URN: urn:nbn:se:uu:diva-141955DOI: 10.1016/j.calphad.2008.04.007ISI: 000260324400014OAI: oai:DiVA.org:uu-141955DiVA, id: diva2:386715
Tilgjengelig fra: 2011-01-13 Laget: 2011-01-13 Sist oppdatert: 2017-12-11bibliografisk kontrollert

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