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Title: First-principles prediction of high-entropy-alloy stability

Journal Article · · npj Computational Materials
 [1];  [1];  [2];  [3]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  2. National Energy Technology Lab. (NETL), Albany, OR (United States)
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics

High entropy alloys (HEAs) are multicomponent compounds whose high configurational entropy allows them to solidify into a single phase, with a simple crystal lattice structure. Some HEAs exhibit desirable properties, such as high specific strength, ductility, and corrosion resistance, while challenging the scientist to make confident predictions in the face of multiple competing phases. We demonstrate phase stability in the multicomponent alloy system of Cr–Mo–Nb–V, for which some of its binary subsystems are subject to phase separation and complex intermetallic-phase formation. Our first-principles calculation of free energy predicts that the configurational entropy stabilizes a single body-centered cubic (BCC) phase from T = 1700 K up to melting, while precipitation of a complex intermetallic is favored at lower temperatures. We form the compound experimentally and confirm that it develops as a single BCC phase from the melt, but that it transforms reversibly at lower temperatures.

Research Organization:
National Energy Technology Lab. (NETL), Albany, OR (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Tennessee, Knoxville, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Fossil Energy (FE); National Science Foundation (NSF); US Army Research Office (ARO)
Grant/Contract Number:
FE0004000; SC0014506; DMR160149; DMR-1611180; W911NF-13-1-0438
OSTI ID:
1482355
Journal Information:
npj Computational Materials, Vol. 3; ISSN 2057-3960
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

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Cited By (6)

Robust cluster expansion of multicomponent systems using structured sparsity journal October 2019
Robust cluster expansion of multicomponent systems using structured sparsity text January 2019
Modeling the structure and thermodynamics of high-entropy alloys journal July 2018
High-entropy functional materials journal September 2018
High-entropy ceramics journal February 2020
Elasticity of high-entropy alloys from ab initio theory journal August 2018

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