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

Journal Article · Fri Jun 09 00:00:00 EDT 2017 · Materials Chemistry and Physics

DOI:https://doi.org/10.1016/j.matchemphys.2017.06.021· OSTI ID:1482356

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)

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.

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

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); National Natural Science Foundation of China (NSFC); 111 Project (China)

Grant/Contract Number:: FE0004000; 51471025; 51671020; B07003; FE-0004000

OSTI ID:: 1482356

Alternate ID(s):: OSTI ID: 1703482

Journal Information:: Materials Chemistry and Physics, Vol. 210; ISSN 0254-0584

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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

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