Phase stability and transformation in a light-weight high-entropy alloy

Feng, Rui; Gao, Michael C.; Zhang, Chuan; Guo, Wei; Poplawsky, Jonathan D.; Zhang, Fan; Hawk, Jeffrey A.; Neuefeind, Joerg C.; Ren, Yang; Liaw, Peter K.

doi:10.1016/j.actamat.2017.12.061

Title: Phase stability and transformation in a light-weight high-entropy alloy

Journal Article · Thu Jan 11 00:00:00 EST 2018 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.12.061· OSTI ID:1471532

Feng, Rui ^[1]; Gao, Michael C. ^[2]; Zhang, Chuan ^[3]; Guo, Wei ^[4]; Poplawsky, Jonathan D. ^[4]; Zhang, Fan ^[3]; Hawk, Jeffrey A. ^[5]; Neuefeind, Joerg C. ^[6]; Ren, Yang ^[7]; Liaw, Peter K. ^[1]

Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
CompuTherm LLC, Middleton, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophases Materials Sciences
National Energy Technology Lab. (NETL), Albany, OR (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source

Light-weight high-entropy alloys (HEAs) with a vast alloy-design space have offered new avenues to explore novel low-cost, high strength-to-weight ratio structural materials. Studying their phase stability and possible transformations is critical for designing microstructures for optimal material properties. However, the complex local atomic environment of HEAs poses challenges to the fundamental understanding of phase stability and transformation behaviors. The present study investigates the phase stability and transformation behaviors of a newly-designed light-weight Al1.5CrFeMnTi HEA by integrated experimental and theoretical approaches. The coherent precipitation of the L21 phase within the body-centered-cubic (BCC) matrix at intermediate temperatures was observed, and the size, shape, coherency, and spatial distribution of the L21 phase were subsequently altered through selected annealing treatments. Moreover, the CALculation of PHAse Diagrams (CALPHAD) and first-principle calculations successfully optimize the compositions of light-weight HEAs with a coherent BCC/L21 two-phase structure. Shed light by the present study, novel light-weight HEAs, featuring the lower density (below 6 g/cm3) and cost, can be designed for high-temperature applications.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); National Energy Technology Lab. (NETL), Albany, OR (United States); Univ. of Tennessee, Knoxville, TN (United States); AECOM, Albany, OR (United States); National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Fossil Energy (FE); US Army Research Office (ARO); National Science Foundation (NSF); Ministry of Science and Technology (MOST) (Taiwan)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725; FE0008855; FE0024054; FE0011194; FE0004000; W911NF-13-1-0438; DMR-1611180; 105-2221-E-007-017-MY3; FE-0008855; FE-0004000; FE-0024054; FE-0011194

OSTI ID:: 1471532

Alternate ID(s):: OSTI ID: 1474496; OSTI ID: 1482372; OSTI ID: 1548808

Journal Information:: Acta Materialia, Vol. 146; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 88 works

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