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

Xia, S. Q.; Gao, M. C.; Zhang, Y.

doi:10.1016/j.matchemphys.2017.06.021

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

Abstract

The effect of Al contents and the associated phase transformations on the impact toughness of Al_xCoCrFeNi 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 Al_xCoCrFeNi system HEAs with low Al contents (x < 0.5) may be well suitable for cryogenic applications.

Authors:

Xia, S. Q. ^[1]; Gao, M. C. ^[2];

^[1]

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:: 2017-06-09

Research Org.:: National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States); Univ. of Science and Technology Beijing (China)

Sponsoring Org.:: USDOE Office of Fossil Energy (FE); National Natural Science Foundation of China (NNSFC); 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.

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                    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

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                    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.

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@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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Works referencing / citing this record:

Effects of Al Addition on Microstructures and Mechanical Properties of CoCrFeMnNiAlx High Entropy Alloy Films
journal, December 2019

Hsu, Ya-Chu; Li, Chia-Lin; Hsueh, Chun-Hway
Entropy, Vol. 22, Issue 1
DOI: 10.3390/e22010002

Phase Transformation Kinetics of a FCC Al0.25CoCrFeNi High-Entropy Alloy during Isochronal Heating
journal, December 2018

Wang, Jun; Wei, Chen; Yang, Haoxue
Metals, Vol. 8, Issue 12
DOI: 10.3390/met8121015

High-Entropy Alloys: Potential Candidates for High-Temperature Applications - An Overview
journal, October 2017

Praveen, Sathiyamoorthi; Kim, Hyoung Seop
Advanced Engineering Materials, Vol. 20, Issue 1
DOI: 10.1002/adem.201700645

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

Abstract

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