Equilibrium high entropy alloy phase stability from experiments and thermodynamic modeling

SCRIPTA MATERIALIA

卷:146

Article

Saal, James E.¹  Berglund, Ida S.¹  Sebastian, Jason T.¹  Liaw, Peter K.²  Olson, Greg B.^1,3 

[1] QuesTek Innovat LLC, Evanston, IL 60201 USA

[2] Univ Tennessee, Knoxville, TN USA

[3] Northwestern Univ, Evanston, IL USA

关键词: CALPHAD;    Phase diagram;    Metal and alloys;    Microstructure;   

DOI  :  10.1016/j.scriptamat.2017.10.027

来源: Elsevier

【 摘 要 】

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. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free