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Title: Abnormal temperature dependence of impact toughness in AlxCoCrFeNi system high entropy alloys

Abstract

The effect of Al contents and the associated phase transformations on the impact toughness of AlxCoCrFeNi high-entropy alloys (HEAs) (x denotes Al molar ratio; x = 0, 0.1, 0.75, and 1.5) in the as-cast state were investigated at T = 77 K, 200 K, and 298 K. For the alloys with x = 0 and 0.1, the alloys have the FCC structure, and an inverse temperature dependence of impact toughness between 298 K and 77 K was observed. The enhanced impact toughness (397.87 J) at 77 K is attributed to the capability of extensive nano-twinnings as well as ductile dimple fracture. Increasing Al contents to x = 0.75 and 1.5 induces the formation of brittle BCC phase and ordered B2 compound and accordingly embrittlement, leading to tremendously reduced Charpy-impact energies. Finally, the present study demonstrates that FCC AlxCoCrFeNi system HEAs with low Al contents (x < 0.5) may be well suitable for cryogenic applications.

Authors:
 [1];  [2]; ORCiD logo [1]
  1. Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
  2. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States); University of Science and Technology Beijing (China)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE); National Natural Science Foundation of China (NSFC); 111 Project (China)
OSTI Identifier:
1482356
Alternate Identifier(s):
OSTI ID: 1703482
Grant/Contract Number:  
FE0004000; 51471025; 51671020; B07003; FE-0004000
Resource Type:
Accepted Manuscript
Journal Name:
Materials Chemistry and Physics
Additional Journal Information:
Journal Volume: 210; Journal ID: ISSN 0254-0584
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high entropy alloys; Charpy-impact toughness; temperature dependence; cryogenic temperature

Citation Formats

Xia, S. Q., Gao, M. C., and Zhang, Y. Abnormal temperature dependence of impact toughness in AlxCoCrFeNi system high entropy alloys. United States: N. p., 2017. Web. doi:10.1016/j.matchemphys.2017.06.021.
Xia, S. Q., Gao, M. C., & Zhang, Y. Abnormal temperature dependence of impact toughness in AlxCoCrFeNi system high entropy alloys. United States. https://doi.org/10.1016/j.matchemphys.2017.06.021
Xia, S. Q., Gao, M. C., and Zhang, Y. Fri . "Abnormal temperature dependence of impact toughness in AlxCoCrFeNi system high entropy alloys". United States. https://doi.org/10.1016/j.matchemphys.2017.06.021. https://www.osti.gov/servlets/purl/1482356.
@article{osti_1482356,
title = {Abnormal temperature dependence of impact toughness in AlxCoCrFeNi system high entropy alloys},
author = {Xia, S. Q. and Gao, M. C. and Zhang, Y.},
abstractNote = {The effect of Al contents and the associated phase transformations on the impact toughness of AlxCoCrFeNi high-entropy alloys (HEAs) (x denotes Al molar ratio; x = 0, 0.1, 0.75, and 1.5) in the as-cast state were investigated at T = 77 K, 200 K, and 298 K. For the alloys with x = 0 and 0.1, the alloys have the FCC structure, and an inverse temperature dependence of impact toughness between 298 K and 77 K was observed. The enhanced impact toughness (397.87 J) at 77 K is attributed to the capability of extensive nano-twinnings as well as ductile dimple fracture. Increasing Al contents to x = 0.75 and 1.5 induces the formation of brittle BCC phase and ordered B2 compound and accordingly embrittlement, leading to tremendously reduced Charpy-impact energies. Finally, the present study demonstrates that FCC AlxCoCrFeNi system HEAs with low Al contents (x < 0.5) may be well suitable for cryogenic applications.},
doi = {10.1016/j.matchemphys.2017.06.021},
journal = {Materials Chemistry and Physics},
number = ,
volume = 210,
place = {United States},
year = {2017},
month = {6}
}

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