Computation of entropies and phase equilibria in refractory V-Nb-Mo-Ta-W high-entropy alloys

Yi Wang, Ming Yan, Qiang Zhu, Williams Yi Wang, Yidong Wu, Xidong Hui, Richard Otis, Shun Li Shang, Zi Kui Liu, Long Qing Chen

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

We have applied the first-principles phonon method to the refractory V-Nb-Mo-Ta-W high-entropy alloys (HEAs) to predict the major phase separations in the temperature-compositional space and hence the associated entropy changes within the systems, taking into account vibrational, electronic, and configurational contributions to the total entropy. The first-principles calculations covered 178 phases ranging from pure elements, the ordered B2, B32, B23, B22, hR8, hR7, tI6, C15, and D03 binary phases, two ordered MoNbTaW quaternary phases, and the partially disordered and completely disordered bcc phases. By sorting their relative phase stabilities with the Dantzig's simplex minimization algorithm, the possibilities of phase separation for the refractory quaternary and quinary HEAs were thermodynamically found in the temperature range of 500–907 K.

Original languageEnglish (US)
Pages (from-to)88-101
Number of pages14
JournalActa Materialia
Volume143
DOIs
StatePublished - Jan 15 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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