Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 11: Structurally and Chemically Complex Alloys
MM 11.2: Talk
Tuesday, March 10, 2026, 10:30–10:45, SCH/A215
Radiation Tolerance in High Entropy Alloys — •Jyoti Verma1, Paul Chekhonin2, Andreas Worbs1, Cornelia Kaden2, Maciej Oskar Liedke3, and Gregor Hlawacek1 — 1Institute of Ion Beam Physics and Material Research,Helmholtz Zentrum Dresden Rossendorf, Bautzner Landstrasse 400 — 2Institute of Resource Ecology,Helmholtz Zentrum Dresden Rossendorf, Bautzner Landstrasse 400 — 3Institute of Radiation Physics,Helmholtz Zentrum Dresden Rossendorf, Bautzner Landstrasse 400
High-entropy alloys (HEAs), or compositionally complex alloys (CCAs), are near-equiatomic multicomponent materials forming single-phase solid solutions with exceptional mechanical strength, thermal stability, and radiation resistance, making them strong candidates for structural use in advanced nuclear systems. In Generation IV fission and future fusion reactors, materials must endure 500*600 °C, high neutron fluxes, and helium and hydrogen generated by 14 MeV neutrons, which significantly influence irradiation-induced defect evolution. We are investigating the irradiation response of Co-free (CrFeMnNi) CCAs using Fe-ion irradiation at 300°C to 1, 3, and 10 dpa. Transmission electron microscopy revealed typical dislocation loops, while positron annihilation spectroscopy identified vacancy-type defects and vacancy-dislocation complexes, whose concentration decreased with dose, suggesting progressive interaction and annihilation between vacancies and dislocations at higher irradiation levels. These results demonstrate the promising irradiation tolerance of Co-free CCAs for structural use in next-generation reactors.
Keywords: High Entropy Alloys; Compositionally Complex Alloys; Structural material; Defects; Nuclear Fusion and fession