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

Abstract

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 paper 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. Finally, 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.

Authors:
 [1];  [2];  [3];  [4];  [4];  [3];  [5];  [6];  [7];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  2. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
  3. CompuTherm LLC, Middleton, WI (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophases Materials Sciences
  5. National Energy Technology Lab. (NETL), Albany, OR (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  7. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (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 Org.:
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)
OSTI Identifier:
1471532
Alternate Identifier(s):
OSTI ID: 1474496; OSTI ID: 1482372; OSTI ID: 1548808
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
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 146; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-entropy alloys; phase stability; phase transformation; precipitation

Citation Formats

Feng, Rui, Gao, Michael C., Zhang, Chuan, Guo, Wei, Poplawsky, Jonathan D., Zhang, Fan, Hawk, Jeffrey A., Neuefeind, Joerg C., Ren, Yang, and Liaw, Peter K. Phase stability and transformation in a light-weight high-entropy alloy. United States: N. p., 2018. Web. doi:10.1016/j.actamat.2017.12.061.
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. Phase stability and transformation in a light-weight high-entropy alloy. United States. https://doi.org/10.1016/j.actamat.2017.12.061
Feng, Rui, Gao, Michael C., Zhang, Chuan, Guo, Wei, Poplawsky, Jonathan D., Zhang, Fan, Hawk, Jeffrey A., Neuefeind, Joerg C., Ren, Yang, and Liaw, Peter K. Thu . "Phase stability and transformation in a light-weight high-entropy alloy". United States. https://doi.org/10.1016/j.actamat.2017.12.061. https://www.osti.gov/servlets/purl/1471532.
@article{osti_1471532,
title = {Phase stability and transformation in a light-weight high-entropy alloy},
author = {Feng, Rui and Gao, Michael C. and Zhang, Chuan and Guo, Wei and Poplawsky, Jonathan D. and Zhang, Fan and Hawk, Jeffrey A. and Neuefeind, Joerg C. and Ren, Yang and Liaw, Peter K.},
abstractNote = {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 paper 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. Finally, 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.},
doi = {10.1016/j.actamat.2017.12.061},
journal = {Acta Materialia},
number = ,
volume = 146,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:

Citation Metrics:
Cited by: 11 works
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Figures / Tables:

Fig. 1 Fig. 1: EBSD-phase mappings. (a) the as-cast state, (b) the annealed state at 750 °C for 168 h, (c) the annealed state at 850 °C for 168 h, (d) the annealed state at 1,000 °C for 504 h, and (e) the annealed state at 1,200 °C for 168 h (themore » red and blue regions represent the BCC + L21 and C14 phases, respectively. Meanwhile the fraction of each phase was given, and the insets are the corresponding enlarged BSE images of each state).« less

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