Composition and Structure of NiCoFeCr and NiCoFeCrMn High-Entropy Alloys Irradiated by Helium Ions
Amanzhulov B. Ivanov I. Uglov V. Zlotski S. Ryskulov A. Kurakhmedov A. Koloberdin M. Zdorovets M.
May 2023Multidisciplinary Digital Publishing Institute (MDPI)
Materials
2023#16Issue 10
High-entropy alloys (HEAs) have prospects for use as nuclear structural materials. Helium irradiation can form bubbles deteriorating the structure of structural materials. The structure and composition of NiCoFeCr and NiCoFeCrMn HEAs formed by arc melting and irradiated with low-energy 40 keV He2+ ions and a fluence of 2 × 1017 cm−2 have been studied. Helium irradiation of two HEAs does not change the elemental and phase composition, and does not erode the surface. Irradiation of NiCoFeCr and NiCoFeCrMn with a fluence of 5 × 1016 cm−2 forms compressive stresses (−90 … −160 MPa) and the stresses grow over −650 MPa as fluence increases to 2 × 1017 cm−2. Compressive microstresses grow up to 2.7 GPa at a fluence of 5 × 1016 cm−2, and up to 6.8 GPa at 2 × 1017 cm−2. The dislocation density rises by a factor of 5–12 for a fluence of 5 × 1016 cm−2, and by 30–60 for a fluence of 2 × 1017 cm−2. Stresses and dislocation density in the HEAs change the most in the region of the maximal damage dose. NiCoFeCrMn has higher macro- and microstresses, dislocation density, and a larger increase in their values, with an increasing helium ion fluence compared to NiCoFeCr. NiCoFeCrMn a showed higher radiation resistance compared to NiCoFeCr.
high-entropy alloys , microstress , radiation resistance , Rutherford backscattering , X-ray diffraction
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Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Department of Nuclear Physics, New Materials and Technologies, Physical-Technical Faculty, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Solid State Physics, Belarusian State University, Minsk, 220030, Belarus
Institute of Nuclear Physics
Department of Nuclear Physics
Engineering Profile Laboratory
Department of Solid State Physics
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