TY - JOUR
T1 - Irradiation induced creep in nanocrystalline high entropy alloys
AU - Jawaharram, Gowtham Sriram
AU - Barr, Christopher M.
AU - Monterrosa, Anthony M.
AU - Hattar, Khalid
AU - Averback, Robert S.
AU - Dillon, Shen J
N1 - SJD, GSJ, and RSA were supported by the US DOE Office of Basic Energy Sciences, Materials Science and Engineering Division under Grant DE-SC0019875. CMB and KH were also supported by the DOE-BES Materials Science and Engineering Division, but under a separate FWP 15013170. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc. for the U.S. DOE's National Nuclear Security Administration under contract DE-NA-0003525. The views expressed in the article do not necessarily represent the views of the U.S. DOE or the United States Government.
SJD, GSJ, and RSA were supported by the US DOE Office of Basic Energy Sciences, Materials Science and Engineering Division under Grant DE-SC0019875 . CMB and KH were also supported by the DOE-BES Materials Science and Engineering Division , but under a separate FWP 15013170 . This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOE's National Nuclear Security Administration under contract DE-NA-0003525 . The views expressed in the article do not necessarily represent the views of the U.S. DOE or the United States Government.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - Irradiation induced creep (IIC) compliance in NiCoFeCrMn high entropy alloys is measured as a function of grain size (30 < x < 80 nm) and temperature (23–500 °C). For 2.6 MeV Ag3+ irradiation at a dose rate of 1.5×10– 3 dpa− 1s− 1 the transition from the recombination to sink limited regimes occurs at ∼ 100 °C. In the sink-limited regime, the IIC compliance scales inversely with grain size, consistent with a recently proposed model for grain boundary IIC. The thermal creep rate is also measured; it does not become comparable to the IIC rate, however, until ∼ 650 °C. The results are discussed in context of defect kinetics in irradiated HEA systems.
AB - Irradiation induced creep (IIC) compliance in NiCoFeCrMn high entropy alloys is measured as a function of grain size (30 < x < 80 nm) and temperature (23–500 °C). For 2.6 MeV Ag3+ irradiation at a dose rate of 1.5×10– 3 dpa− 1s− 1 the transition from the recombination to sink limited regimes occurs at ∼ 100 °C. In the sink-limited regime, the IIC compliance scales inversely with grain size, consistent with a recently proposed model for grain boundary IIC. The thermal creep rate is also measured; it does not become comparable to the IIC rate, however, until ∼ 650 °C. The results are discussed in context of defect kinetics in irradiated HEA systems.
KW - High entropy alloy (HEA)
KW - In situ transmission electron microscopy
KW - Irradiation induced creep
KW - Vacancy migration enthalpy
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U2 - 10.1016/j.actamat.2019.10.022
DO - 10.1016/j.actamat.2019.10.022
M3 - Article
AN - SCOPUS:85074254221
SN - 1359-6454
VL - 182
SP - 68
EP - 76
JO - Acta Materialia
JF - Acta Materialia
ER -