Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling

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 ecompositi...

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Bibliographic Details
Published inScripta materialia Vol. 146; no. C
Main Authors Saal, James E., Berglund, Ida S., Sebastian, Jason T., Liaw, Peter K., Olson, Greg B.
Format Journal Article
LanguageEnglish
Published United States Elsevier 29.10.2017
Subjects
CALPHAD
MATERIALS SCIENCE
Metal and alloys
Microstructure
Phase diagram
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Summary: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 ecomposition after long-termequilibration. In the presentwork,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. As a result, we find good agreement between single- and multi-phase predictions and experiments.
Bibliography:SC0013220
USDOE Office of Science (SC)
ISSN:1359-6462
1872-8456