Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling

James E. Saal*, Ida S. Berglund, Jason T. Sebastian, Peter K. Liaw, Greg B. Olson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Long-term stability of high entropy alloys (HEAs) is a critical consideration for the design and practical application of HEAs. It has long been assumed that many HEAs are a kinetically-stabilized metastable structure, and recent experiments have confirmed this hypothesis by observing HEA decomposition after long-term equilibration. In the present work, we demonstrate the use of the CALculation of PHAse Diagrams (CALPHAD) approach to predict HEA stability and processing parameters, comparing experimental long-term annealing observations to CALPHAD phase diagrams from a commercially-available HEA database. We find good agreement between single- and multi-phase predictions and experiments.

Original languageEnglish (US)
Pages (from-to)5-8
Number of pages4
JournalScripta Materialia
Volume146
DOIs
StatePublished - Mar 15 2018

Keywords

  • CALPHAD
  • Metal and alloys
  • Microstructure
  • Phase diagram

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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