Radiation Resistance of High-Entropy Alloys CoCrFeNi and CoCrFeMnNi, Sequentially Irradiated with Kr and He Ions
Amanzhulov B. Ivanov I. Uglov V. Zlotski S. Ryskulov A. Kurakhmedov A. Sapar A. Ungarbayev Y. Koloberdin M. Zdorovets M.
October 2024Multidisciplinary Digital Publishing Institute (MDPI)
Materials
2024#17Issue 19
This work studied the effect of sequential irradiation by krypton and helium ions at room temperature on the composition and structure of CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs). Irradiation of the HEAs by 280 keV Kr14+ ions up to a fluence of 5 × 1015 cm–2 and 40 keV He2+ ions up to a fluence of 2 × 1017 cm–2 did not alter their elemental distribution and constituent phases. Blisters formed on the nickel surface after sequential irradiation, where large blisters had an average diameter of 3.8 μm. The lattice parameter of the (Co, Cr, Fe and Ni) and (Co, Cr, Fe, Mn and Ni) solid solutions increased by 0.17% and 0.37% after sequential irradiation, respectively. Irradiation by Kr ions led to a decrease in tensile macrostresses in the HEAs in the region of krypton ion implantation (Region I) and the formation of compressive macrostresses in the region behind the peak of implanted krypton (Region II). Sequential irradiation formed large compressive stresses in Ni and HEAs equal to −131.5 MPa, −300 MPa and −613.5 MPa in Ni, CoCrFeNi and CoCrFeMnNi, respectively, in the Region II. Irradiation by krypton ions decreased the dislocation density by 1.6–2.3 times, and irradiation with helium ions increased it by 11–15 times relative to unirradiated samples for CoCrFeNi and CoCrFeMnNi, respectively. Sequentially irradiated CoCrFeMnNi HEA had higher macrostresses and dislocation density than CoCrFeNi.
dislocation density , GIXRD analysis , high-entropy alloys , macrostress , radiation resistance
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Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
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
Physical-Technical Faculty
Engineering Profile Laboratory
Department of Solid State Physics
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