Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation

Barr, Christopher M.; Nathaniel, James E.; Unocic, Kinga A.; Liu, Junpeng; Zhang, Yong; Wang, Yongqiang; Taheri, Mitra L.

doi:10.1016/j.scriptamat.2018.06.041

Title: Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation

Journal Article · Fri Jul 20 00:00:00 EDT 2018 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2018.06.041· OSTI ID:1474462

Barr, Christopher M. ^[1]; Nathaniel, James E. ^[1];

^[2]; Liu, Junpeng ^[3]; Zhang, Yong ^[3]; Wang, Yongqiang ^[4]; Taheri, Mitra L. ^[1]

Drexel Univ., Philadelphia, PA (United States). Materials Science and Engineering Dept.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

High entropy alloys have gained significant interest due to several unique properties including enhanced radiation resistance. Here, radiation induced segregation, a key phenomenon observed in alloys under irradiation, is examined for the first time at high angle grain boundaries under Ni heavy ion irradiation in the CoCrFeNiMn alloy. Our experimental study indicates significant Mn depletion and Co and Ni enrichment at grain boundaries. The segregation is discussed in the context of a proposed vacancy dominated radiation induced segregation mechanism and compared to existing models in conventional single core component alloys including stainless steels.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)