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Entropy 2016, 18(9), 333; doi:10.3390/e18090333

Design of Light-Weight High-Entropy Alloys

1
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA
2
National Energy Technology Laboratory, Albany, OR 97321, USA
3
AECOM, P.O. Box 1959, Albany, OR 97321, USA
4
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology, Beijing, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Academic Editor: An-Chou Yeh
Received: 2 July 2016 / Revised: 21 August 2016 / Accepted: 5 September 2016 / Published: 13 September 2016
(This article belongs to the Special Issue High-Entropy Alloys and High-Entropy-Related Materials)
View Full-Text   |   Download PDF [4197 KB, uploaded 13 September 2016]   |  

Abstract

High-entropy alloys (HEAs) are a new class of solid-solution alloys that have attracted worldwide attention for their outstanding properties. Owing to the demand from transportation and defense industries, light-weight HEAs have also garnered widespread interest from scientists for use as potential structural materials. Great efforts have been made to study the phase-formation rules of HEAs to accelerate and refine the discovery process. In this paper, many proposed solid-solution phase-formation rules are assessed, based on a series of known and newly-designed light-weight HEAs. The results indicate that these empirical rules work for most compositions but also fail for several alloys. Light-weight HEAs often involve the additions of Al and/or Ti in great amounts, resulting in large negative enthalpies for forming solid-solution phases and/or intermetallic compounds. Accordingly, these empirical rules need to be modified with the new experimental data. In contrast, CALPHAD (acronym of the calculation of phase diagrams) method is demonstrated to be an effective approach to predict the phase formation in HEAs as a function of composition and temperature. Future perspectives on the design of light-weight HEAs are discussed in light of CALPHAD modeling and physical metallurgy principles. View Full-Text
Keywords: single-phase solid solutions; intermetallics; phase-formation rules; light-weight HEAs; enthalpy of mixing; entropy of mixing; CALPHAD; excess entropy single-phase solid solutions; intermetallics; phase-formation rules; light-weight HEAs; enthalpy of mixing; entropy of mixing; CALPHAD; excess entropy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Feng, R.; Gao, M.C.; Lee, C.; Mathes, M.; Zuo, T.; Chen, S.; Hawk, J.A.; Zhang, Y.; Liaw, P.K. Design of Light-Weight High-Entropy Alloys. Entropy 2016, 18, 333.

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