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Title: Design of Light-Weight High-Entropy Alloys

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

Authors:
; ; ; ; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Albany, OR (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1419603
Alternate Identifier(s):
OSTI ID: 1482332
Grant/Contract Number:  
FE-0024054; FE-0008855; CMMI-1100080; DMR-1611180
Resource Type:
Published Article
Journal Name:
Entropy
Additional Journal Information:
Journal Name: Entropy Journal Volume: 18 Journal Issue: 9; Journal ID: ISSN 1099-4300
Publisher:
MDPI AG
Country of Publication:
Switzerland
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Feng, Rui, Gao, Michael, Lee, Chanho, Mathes, Michael, Zuo, Tingting, Chen, Shuying, Hawk, Jeffrey, Zhang, Yong, and Liaw, Peter. Design of Light-Weight High-Entropy Alloys. Switzerland: N. p., 2016. Web. doi:10.3390/e18090333.
Feng, Rui, Gao, Michael, Lee, Chanho, Mathes, Michael, Zuo, Tingting, Chen, Shuying, Hawk, Jeffrey, Zhang, Yong, & Liaw, Peter. Design of Light-Weight High-Entropy Alloys. Switzerland. doi:10.3390/e18090333.
Feng, Rui, Gao, Michael, Lee, Chanho, Mathes, Michael, Zuo, Tingting, Chen, Shuying, Hawk, Jeffrey, Zhang, Yong, and Liaw, Peter. Tue . "Design of Light-Weight High-Entropy Alloys". Switzerland. doi:10.3390/e18090333.
@article{osti_1419603,
title = {Design of Light-Weight High-Entropy Alloys},
author = {Feng, Rui and Gao, Michael and Lee, Chanho and Mathes, Michael and Zuo, Tingting and Chen, Shuying and Hawk, Jeffrey and Zhang, Yong and Liaw, Peter},
abstractNote = {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},
doi = {10.3390/e18090333},
journal = {Entropy},
number = 9,
volume = 18,
place = {Switzerland},
year = {2016},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.3390/e18090333

Citation Metrics:
Cited by: 32 works
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Works referenced in this record:

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    Works referencing / citing this record:

    TCHEA1: A Thermodynamic Database Not Limited for “High Entropy” Alloys
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