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This study evaluates the influence of chemical composition on proton-induced primary radiation damage in selected Al–Li–X alloys relevant to space applications. The hypothesis assumes that variations in alloying additions lead to measurable differences in defect magnitude and spatial distribution under identical irradiation conditions. Monte Carlo simulations based on the Binary Collision Approximation were performed to model proton irradiation in a near-Earth space environment over a broad energy range, followed by detailed calculations at 30, 90, and 2000 keV. The results show a clear dependence of primary radiation damage on proton energy. Maximum vacancy concentration and damage uniformity factor decrease with increasing energy. Differences between alloys are most pronounced at low energy, where elastic collisions dominate atomic displacements. At higher energies, defect magnitude and spatial distribution become largely independent of composition. The results support the proposed hypothesis and provide insight relevant to the selection of Al–Li–X alloys for structural applications in the space radiation environment.nuclear stopping
Keywords: Al-Li-X alloys, proton irradiation, primary radiation damage, Binary Collision Approximation,© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.