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

doi:10.1016/j.scriptamat.2017.10.027

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

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-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 language	English (US)
Pages (from-to)	5-8
Number of pages	4
Journal	Scripta Materialia
Volume	146
DOIs	https://doi.org/10.1016/j.scriptamat.2017.10.027
State	Published - 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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title = "Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling",

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.",

keywords = "CALPHAD, Metal and alloys, Microstructure, Phase diagram",

author = "Saal, {James E.} and Berglund, {Ida S.} and Sebastian, {Jason T.} and Liaw, {Peter K.} and Olson, {Greg B.}",

note = "Funding Information: We gratefully acknowledge the funding of the Department of Energy Office of Science and the Small Business Innovation Research program (contract number DE-SC0013220 ).",

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doi = "10.1016/j.scriptamat.2017.10.027",

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T1 - Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling

AU - Saal, James E.

AU - Berglund, Ida S.

AU - Sebastian, Jason T.

AU - Liaw, Peter K.

AU - Olson, Greg B.

N1 - Funding Information: We gratefully acknowledge the funding of the Department of Energy Office of Science and the Small Business Innovation Research program (contract number DE-SC0013220 ).

PY - 2018/3/15

Y1 - 2018/3/15

N2 - 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.

AB - 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.

KW - CALPHAD

KW - Metal and alloys

KW - Microstructure

KW - Phase diagram

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