SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 42: Interface Controlled Properties and Nanomaterials: Nanoporous Materials and Nanolaminates

MM 42.9: Vortrag

Donnerstag, 30. März 2023, 18:00–18:15, SCH A 215

Interface-related defect annihilation in high entropy amorphous/crystalline nanolaminates under ion irradiation — •qi xu¹, daniel sopu¹, xudong yuan¹, and jürgen eckert^1,2 — ¹Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, Leoben A-8700, Austria — ²Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, Leoben A-8700, Austria

The main challenge of designing nuclear materials that possess a high irradiation resistance is accumulation of point defects-induced structural damage. The interfaces and grain boundaries play a critical role on the defect generation and annihilation in nanostructured materials. In this work, the irradiation-induced microstructure evolution as well as defect production and recovery in metallic glass (MG) / high entropy alloy (HEA) nanolaminates were investigated by molecular dynamics (MD) simulations. The displacement cascades were simulated for the energies of primary knock-on atoms (PKA) at 5, 10 keV and 15 keV. It was found that, there are more displaced atoms in the thermal spike phase for MG/HEA laminate compared with free-standing MG and HEA. In addition, the interface acts as defect sink and accelerates the recombination and annihilation of interstitial in HEA plate, which leads to more residual vacancies in crystalline plate. Moreover, the residual vacancies diffusion induces the generation of dislocation loops in the HEA plate. Furthermore, the interface acts as a transfer medium that accelerates the crystallization of MG plate during irradiation.