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:
-
- Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
- 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 = {Fri Jun 09 00:00:00 EDT 2017},
month = {Fri Jun 09 00:00:00 EDT 2017}
}
Web of Science
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