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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 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.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [3]
  1. QuesTek Innovations LLC, Evanston, IL (United States)
  2. The Univ. of Tennessee, Knoxville, TN (United States)
  3. QuesTek Innovations LLC, Evanston, IL (United States); Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
QuesTek Innovations LLC, Evanston, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1405304
Grant/Contract Number:
SC0013220
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 146; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALPHAD; Phase diagram; Metal and alloys; Microstructure

Citation Formats

Saal, James E., Berglund, Ida S., Sebastian, Jason T., Liaw, Peter K., and Olson, Greg B.. Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling. United States: N. p., 2017. Web. doi:10.1016/j.scriptamat.2017.10.027.
Saal, James E., Berglund, Ida S., Sebastian, Jason T., Liaw, Peter K., & Olson, Greg B.. Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling. United States. doi:10.1016/j.scriptamat.2017.10.027.
Saal, James E., Berglund, Ida S., Sebastian, Jason T., Liaw, Peter K., and Olson, Greg B.. Sun . "Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling". United States. doi:10.1016/j.scriptamat.2017.10.027.
@article{osti_1405304,
title = {Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling},
author = {Saal, James E. and Berglund, Ida S. and Sebastian, Jason T. and Liaw, Peter K. and Olson, Greg B.},
abstractNote = {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.},
doi = {10.1016/j.scriptamat.2017.10.027},
journal = {Scripta Materialia},
number = C,
volume = 146,
place = {United States},
year = {Sun Oct 29 00:00:00 EDT 2017},
month = {Sun Oct 29 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 29, 2018
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