Radiation damage buildup by athermal defect reactions in nickel and concentrated nickel alloys

Abstract

We develop a new method using binary collision approximation simulating the Rutherford backscattering spectrometry in channeling conditions (RBS/C) from molecular dynamics atom coordinates of irradiated cells. The approach allows comparing experimental and simulated RBS/C signals as a function of depth without fitting parameters. The simulated RBS/C spectra of irradiated Ni and concentrated solid solution alloys (CSAs, NiFe and NiCoCr) show a good agreement with the experimental results. The good agreement indicates the damage evolution under damage overlap conditions in Ni and CSAs at room temperature is dominated by defect recombination and migration induced by irradiation rather than activated thermally. IMPACT STATEMENT • A new method simulating the Rutherford backscattering Spectrometry in channeling conditions (RBS/C) was proposed. • The RBS/C simulations reveal that the radiation damage buildup in Ni, NiFe and NiCoCr was dominated by athermal defect reactions.

Local segregation versus irradiation effects in high-entropy alloys: Steady-state conditions in a driven system

“…33,34 This irradiation simulation approach has previously been demonstrated to lead to a good agreement with experiments on other HEAs. 19,35 D. Analysis of short-range order and lattice defects In order to quantify the chemical ordering, we used the Warren-Cowley short-range order (SRO) parameters α 1 and α 2 adapted to a multicomponent alloy 36…”

Radiation stability of nanocrystalline single-phase multicomponent alloys

“…10 and 13. This scheme has been seen to yield comparable results with experiments for single crystalline samples, where experimental Rutherford Backscattering Spectroscopy in a channeling direction (RBS-C) spectra were compared with the ones obtained from the simulated results [27,37]. In the following, we outline the main differences and main principals of the irradiation procedure.…”

“…shown to yield comparable results with experiments [27]. We focus on several Ni-based alloys, as they have been showing good resistance to irradiation in single crystal form.…”

Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys

“…In order to evaluate qualitatively the evolution of the relative disorder resulting from the Ar-ion irradiation, disorder profiles were extracted from the analysis of RBS/C spectra (these spectra are plotted in Figure S1 of the supplementary material) using an iterative procedure [41], which has been previously used to analyze ion-irradiated SP-CSAs at RT [18,19] and validated in some recent molecular dynamics simulations [42,43]. The obtained disorder profiles for Ar-irradiated Ni (red circles) are illustrated in Figure 1 and compared with those for Arirradiated NiFe (blue triangles) and NiFeCoCr (green squares) single crystals.…”