Thermodynamic assessment of the V-N system

Yong Du, Rainer Schmid-Fetzer, Hiroshi Ohtani

Research output: Contribution to journalArticlepeer-review

144 Citations (Scopus)

Abstract

A consistent thermodynamic data set for the V-N system is obtained by a computer-aided least squares method applied to all of the experimental phase diagram and thermodynamic data available from the literature. The sublattice model V1(N, Va)a is used to model the phases: fcc (a = 1), bcc (a = 3), and hcp (a = 0.5). The liquid phase is described by the Redlich-Kister formula, and the gas phase is treated as an ideal gas. Special attention is paid to the modeling of the fcc phase with its exceptional bulk of experimental data. This phase is first analyzed by an ideal solution, then by a regular, and finally by a subregular interaction in the nitrogen sublattice. The other solution phases are analyzed with similar modeling procedures. This step-bystep analysis procedure permits insight into reliable estimations for the parameters at each of the higher level models. Comparisons between the calculated and measured phase diagram and thermodynamic quantities show that most of the experimental information is satisfactorily accounted for by the thermodynamic calculation. Inconsistent experimental information is identified and ruled out. The thermodynamic property of the fcc phase in the V-N system is compared with those in the Cr-N and Ti-N systems and related to the Neumann-Kopp's rule.

Original languageEnglish
Pages (from-to)545-556
Number of pages12
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume88
Issue number7
Publication statusPublished - 1997 Jul 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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