Unveiling the radiation-induced defect production and damage evolution in tungsten using multi-energy Rutherford backscattering spectroscopy in channeling configuration

• DOI: 10.1016/j.actamat.2023.119499
• Publication Date: 2023-11-04T17:07:20Z
• Authors: S. Markelj; X. Jin; F. Djurabekova; J. Zavašnik; E. Punzón-Quijorna; T. Schwarz- Selinger; M.L. Crespillo; G. García López; F. Granberg; E. Lu; K. Nordlund; A. Šestan; M. Kelemen
• Keywords: Rutherford backscattering spectrometry; radiation damage

Radiation-induced defect production in tungsten was studied by a combination of experimental and simulation methods. The analysis structural defects performed using multi-energy Rutherford backscattering spectroscopy channeling configuration (multi-energy C-RBS). To create different microstructures, (111) (W) single crystals were irradiated with W ions at two doses (0.02 0.2 dpa) 290 K. Detailed transmission electron microscopy (TEM) the samples revealed presence dislocation lines loops sizes. RBSADEC code used to simulate measured C-RBS spectra, recorded four He beam energies along <111> direction. For first time for tungsten, molecular dynamics (MD) simulations overlapping cascades as input. well-known method randomly displaced atoms (RDA) applied comparison. RDA does not provide satisfactory understanding nature induced structure. With MD, very good agreement between simulated spectra obtained sample prepared lower dose, despite fact that absolute densities are orders magnitude higher than those found TEM. A discrepancy is observed high-dose-irradiated sample, which ascribed extended such lines, clearly TEM, but cannot be formed finite size MD cells. cells input can describe correctly response RBS signal analysing energy while gives wrong trend.