Ab initio and thermodynamic study of the CrRe system

M. Palumbo, T. Abe, C. Kocer, H. Murakami, H. Onodera

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In this work the assessment of the CrRe system, using a combined ab initio and CALPHAD (CALculation of Phase Diagrams) approach, is presented. To model the sigma phase, a five-sublattice combined CEF model was applied and the present description reproduces reasonably well the previously published experimental phase diagram. Formation enthalpies of the stable/metastable configurations of the sigma phase were estimated from ab initio calculations. A comparison of results using simplified two- and three-sublattice models and the five-sublattice model for the sigma phase is also presented, which highlights differences in calculated properties as site occupancies. According to present outcomes, the five-sublattice model (Cr,Re)2(Cr,Re) 4(Cr,Re)8(Cr,Re)8(Cr,Re)8, based on Wyckoff positions, is necessary to reproduce the atomic ordering in the sigma phase. Certain areas of the phase diagram still remain uncertain and deserve further experimental investigation.

Original languageEnglish
Pages (from-to)495-503
Number of pages9
JournalCalphad: Computer Coupling of Phase Diagrams and Thermochemistry
Volume34
Issue number4
DOIs
Publication statusPublished - 2010 Dec 1
Externally publishedYes

Keywords

  • Ab initio calculations
  • Enthalpy
  • Intermetallics
  • Phase diagrams
  • Thermodynamic modelling

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Computer Science Applications

Fingerprint Dive into the research topics of 'Ab initio and thermodynamic study of the CrRe system'. Together they form a unique fingerprint.

  • Cite this