Combining MD-LAMMPS and MC-McChasy2 codes for dislocation simulations of Ni single crystal structure

C Mieszczynski and P Jozwik and K Skrobas and K Stefanska-Skrobas and R Ratajczak and J Jagielski and F Garrido and E Wyszkowska and A Azarov and K Lorenz and E Alves, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 540, 38-44 (2023).

DOI: 10.1016/j.nimb.2023.04.010

The unique capability of the new version of the McChasy code (called McChasy2) is to provide the possibility to simulate experimental energy spectra delivered by Rutherford Backscattering Spectrometry in channeling di-rection (RBS/C) using large atomic structures (ca. 108 atoms).Ni-based alloys are nowadays one of the most studied and promising materials that can be used in the power generation sector and in general for high-temperature applications because of their radiation resistance and proof against harsh environmental conditions.In this work, we present recent results of investigations regarding simulations of extended structural defects (edge dislocations and loops) developed in the directions typically observed in the fcc systems that are formed inside nickel-based single-crystal alloys. The extended defect models are created using ATOMSK and the Mo-lecular Dynamics (MD)-LAMMPS thermalization process. The models are then used to create virtual samples and fit experimental RBS/C spectra.

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