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Title: Phase stability and microstructures of high entropy alloys ion irradiated to high doses

Abstract

The microstructures of Al xCoCrFeNi (x = 0.1, 0.75 and 1.5 in molar ratio) high entropy alloys (HEAs) irradiated at room temperature with 3 MeV Au ions at the highest fluence of 105, 91, and 81 displacement per atom, respectively, were studied. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) analyses show that the initial microstructures and phase composition of all three alloys are retained after ion irradiation and no phase decomposition is observed. Furthermore, it is demonstrated that the disordered face-centered cubic (FCC) and disordered body-centered cubic (BCC) phases show much less defect cluster formation and structural damage than the NiAl-type ordered B2 phase. This effect is explained by higher entropy of mixing, higher defect formation/migration energies, substantially lower thermal conductivity, and higher atomic level stress in the disordered phases

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [1]
  1. Univ. of Science and Technology Beijing (China)
  2. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
  3. Peking Univ., Beijing (China)
  4. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Albany, OR (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1482339
Alternate Identifier(s):
OSTI ID: 1460117
Grant/Contract Number:  
51471025; B07003; FE-0004000; CMMI-1100080; W911NF-13-1-0438
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 480; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Xia, Songqin, Gao, Michael C., Yang, Tengfei, Liaw, Peter K., and Zhang, Yong. Phase stability and microstructures of high entropy alloys ion irradiated to high doses. United States: N. p., 2016. Web. doi:10.1016/j.jnucmat.2016.08.017.
Xia, Songqin, Gao, Michael C., Yang, Tengfei, Liaw, Peter K., & Zhang, Yong. Phase stability and microstructures of high entropy alloys ion irradiated to high doses. United States. doi:10.1016/j.jnucmat.2016.08.017.
Xia, Songqin, Gao, Michael C., Yang, Tengfei, Liaw, Peter K., and Zhang, Yong. Thu . "Phase stability and microstructures of high entropy alloys ion irradiated to high doses". United States. doi:10.1016/j.jnucmat.2016.08.017. https://www.osti.gov/servlets/purl/1482339.
@article{osti_1482339,
title = {Phase stability and microstructures of high entropy alloys ion irradiated to high doses},
author = {Xia, Songqin and Gao, Michael C. and Yang, Tengfei and Liaw, Peter K. and Zhang, Yong},
abstractNote = {The microstructures of AlxCoCrFeNi (x = 0.1, 0.75 and 1.5 in molar ratio) high entropy alloys (HEAs) irradiated at room temperature with 3 MeV Au ions at the highest fluence of 105, 91, and 81 displacement per atom, respectively, were studied. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) analyses show that the initial microstructures and phase composition of all three alloys are retained after ion irradiation and no phase decomposition is observed. Furthermore, it is demonstrated that the disordered face-centered cubic (FCC) and disordered body-centered cubic (BCC) phases show much less defect cluster formation and structural damage than the NiAl-type ordered B2 phase. This effect is explained by higher entropy of mixing, higher defect formation/migration energies, substantially lower thermal conductivity, and higher atomic level stress in the disordered phases},
doi = {10.1016/j.jnucmat.2016.08.017},
journal = {Journal of Nuclear Materials},
number = C,
volume = 480,
place = {United States},
year = {2016},
month = {8}
}

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Cited by: 16 works
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