Vladimir State University named after Alexander and Nikolay Stoletovs (Vladimir, Russia)

D. V. Bokaryov, Post-Graduate Researcher, bokarev.1998@list.ru
A. S. Raznoschikov, Post-Graduate Researcher, raznoschikoff.ar@yandex.ru
A. F. Lelekova, Junior Researcher, lelekowa.a@yandex.ru
A. V. Aborkin, Candidate of Technical Sciences, Associate Professor, aborkin@vlsu.ru

In this study, samples were fabricated via selective laser melting (SLM) from composite mixtures based on ASP-30 aluminum powder reinforced with 0.25 vol.% multi-walled carbon nanotubes (CNTs). Powder composites were synthesized through low-energy mechanical processing (LEMP) of the initial constituents in a planetary mill using grinding bodies with diameters of 4 mm and 8 mm. The influence of grinding bodies diameter on particle morphology, structure, and phase composition of the powders was evaluated. It was established that low-energy mechanical processing led to hydrogen and oxygen saturation of the powder mixtures. The mechanism of CNT distribution within the powder mixture during LEMP is described. It has been shown that during SLM of a powder mixture processed with 4 mm diameter milling bodies, the Al4C3 phase forms due to the consumption of defective regions of the CNTs, accompanied by an increase in oxygen content and the consequent formation of the Al₂O₃ phase. For the powder mixture processed with 8 mm grinding bodies, a decrease in the structural integrity of CNTs accompanied by reduced oxygen content was observed, indicating significant CNT degradation under laser exposure. Reinforcement of the AlSi10Mg matrix alloy by both exogenous and endogenous phases, along with structural refinement in samples produced from composite powders, resulted in an increase in microhardness by approximately 21–28% compared to the initial powder, along with a 2.2–2.9-fold improvement in wear resistance.

The research was carried out within the state assignment in the field of scientific activity of the Ministry of Science and Higher Education of the Russian Federation (theme FZUN-2024-0004, state assignment of the VlSU).

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