Understanding phase stability of Al-Co-Cr-Fe-Ni high entropy alloys

Zhang, Chuan; Zhang, Fan; Diao, Haoyan; Gao, Michael C.; Tang, Zhi; Poplawsky, Jonathan D.; Liaw, Peter K.

doi:10.1016/j.matdes.2016.07.073

Title: Understanding phase stability of Al-Co-Cr-Fe-Ni high entropy alloys

Journal Article · Tue Jul 19 00:00:00 EDT 2016 · Materials & Design

DOI:https://doi.org/10.1016/j.matdes.2016.07.073· OSTI ID:1287040

Zhang, Chuan ^[1]; Zhang, Fan ^[1]; Diao, Haoyan ^[2]; Gao, Michael C. ^[3]; Tang, Zhi ^[2]; Poplawsky, Jonathan D. ^[4]; Liaw, Peter K. ^[2]

CompuTherm LLC, Middleton, WI (United States)
Univ. of Tennessee, Knoxville, TN (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The concept of high entropy alloy (HEA) opens a vast unexplored composition range for alloy design. As a well-studied system, Al-Co-Cr-Fe-Ni has attracted tremendous amount of attention to develop new-generation low-density structural materials for automobile and aerospace applications. In spite of intensive investigations in the past few years, the phase stability within this HEA system is still poorly understood and needs to be clarified, which poses obstacles to the discovery of promising Al-Co-Cr-Fe-Ni HEAs. In the present work, the CALPHAD approach is employed to understand the phase stability and explore the phase transformation within the Al-Co-Cr-Fe-Ni system. As a result, the phase-stability mapping coupled with density contours is then constructed within the composition - temperature space, which provides useful guidelines for the design of low-density Al-Co-Cr-Fe-Ni HEAs with desirable properties.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; FE-0008855; FE-0024054

OSTI ID:: 1287040

Alternate ID(s):: OSTI ID: 1359529

Journal Information:: Materials & Design, Vol. 109, Issue C; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 171 works

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