Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 20: Computational Materials Modelling: HEA, Alloys & Nanostructures
MM 20.1: Talk
Wednesday, September 7, 2022, 10:15–10:30, H44
Microstructural evolution of severely deformed nanocomposite high entropy alloys irradiated by swift heavy ions — •Shabnam Taheriniya1, Christian Gadelmeier2, Harald Rösner1, Martin Peterlechner1, Christoph Gammer3, Marilena Tomut1, 4, Sergiy V. Divinski1, Uwe Glatzel2, and Gerhard Wilde1 — 1Institute of Materials Physiks, University of Münster, Germany — 2Metals and Alloys, University of Bayreuth, Bayreuth, Germany — 3Erich Schmid Institute of materials Science, Austrian Academy of Science, Leoben, Austria — 4GSI Helmholtz Center for Heavy Ion Research, Darmstadt, Germany
Structural modifications induced by the processing of high entropy alloys (HEAs) under non-equilibrium conditions are investigated to shed light into the stability of such advanced materials. The nanocomposite HEAs are produced by the room-temperature high pressure torsion (HPT) of stacked single-phase equiatomic FCC CoCrFeMnNi (Cantor) and BCC HfNbTaTiZr (Senkov) alloys. Solely Cantor and Senkov alloys were HPT-processed under the similar conditions, too. Cross-sections of the HPT-processed disks were subjected to high fluences of Au swift-heavy-ion irradiation at ambient and cryogenic temperatures. Deformation and irradiation-induced microstructural changes were examined in detail applying scanning and transmission electron microscopies with respect to evolution of chemical composition and local microstructure. A combination of nano-beam diffraction with angular correlation was utilized to provide information about the resolved crystal structures and strain fields in the different HEA phases.