Hydrogen-enhanced compatibility constraint for intergranular failure in FCC FeNiCoCrMn high-entropy alloy

Bertsch, K. M.; Nygren, K. E.; Wang, S.; Bei, H.; Nagao, A.

doi:10.1016/j.corsci.2021.109407

Title: Hydrogen-enhanced compatibility constraint for intergranular failure in FCC FeNiCoCrMn high-entropy alloy

Journal Article · Thu Mar 18 00:00:00 EDT 2021 · Corrosion Science

DOI:https://doi.org/10.1016/j.corsci.2021.109407· OSTI ID:1775031

Bertsch, K. M. ^[1]; Nygren, K. E. ^[2]; Wang, S. ^[3]; Bei, H. ^[4]; Nagao, A. ^[5]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Illinois at Urbana-Champaign, IL (United States); Kyushu Univ., Fukuoka (Japan); Univ. of Wisconsin, Madison, WI (United States)
Univ. of Wisconsin, Madison, WI (United States); Cornell Univ., Ithaca, NY (United States)
Univ. of Wisconsin, Madison, WI (United States); Southern University of Science and Technology, Shenzhen, Guangdong (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Zhejiang Univ., Hangzhou (China)
Kyushu Univ., Fukuoka (Japan)

The fundamental mechanism of hydrogen embrittlement was investigated in the high-entropy alloy FeNiCoCrMn using slow strain rate tensile tests with and without internal hydrogen. Hydrogen induced intergranular failure and reduced the average grain elongation parallel to the tensile axis, but also increased the local plasticity within grains. Here, the influence of hydrogen on plasticity establishes a compatibility constraint across grain boundaries, which results in failure along the hydrogen-weakened grain boundaries. This study is the first to directly confirm the presence of the hydrogen-enhanced compatibility constraint in a high-entropy alloy and highlights the importance of developing a physical understanding of grain-scale interactions.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: AC52-07NA27344; AC05-00OR22725; CMMI-1406462; DMR-1720415

OSTI ID:: 1775031

Report Number(s):: LLNL-JRNL-811745; 1018068

Journal Information:: Corrosion Science, Vol. 184; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
high-entropy alloy
hydrogen embrittlement
intergranular failure
transmission electron microscopy
orientation mapping

Title: Hydrogen-enhanced compatibility constraint for intergranular failure in FCC FeNiCoCrMn high-entropy alloy

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References (58)

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